ATL02 L1B SET_BY_META Science unit converted time ordered telemetry calibrated for instrument effects. All photon events per channel per transmit pulse. Includes Atmosphere raw profiles. Contains s/c location data. CF-1.6 Thomas A Neumann (thomas.neumann@nasa.gov), Thorsten Markus (thorsten.markus@nasa.gov), Suneel Bhardwaj (suneel.bhardwaj@nasa.gov) David W Hancock III (david.w.hancock@nasa.gov) Instrument Engineer, Investigator, Principle Investigator, Data Producer, Data Producer Data within this group pertain to the granule in its entirety. UTC trajectory degrees_north degrees_east ATL02 http://dx.doi.org Data may not be reproduced or distributed without including the citation for this product included in this metadata. Data may not be distributed in an altered form without the written permission of the ICESat-2 Science Project Office at NASA/GSFC. http://dx.doi.org Horizontal CF-1.6 CCSDS UTC-A 2023-01-03T18:15:50.000000Z HDF5 1.10.7 2023-01-03T18:15:50.000000Z;8add2519-6f47-352b-95c1-dd0a36c20c52;Created by PGE atlas_l1b Version 5.0 8add2519-6f47-352b-95c1-dd0a36c20c52 5.0 423. 2023-01-01T00:03:35.000000Z 2022-12-31T23:56:32.000000Z -26.963315599999998 -149.89922479999998 0.024205599999999997 -147.1225872 NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center nsidc@nsidc.org http://nsidc.org/daac/ ATL02 doi:10.5067/ATLAS/ATL02.006 National Aeronautics and Space Administration (NASA) GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System The purpose of ATL02 is to provide science-unit, calibrated data for upstream processing. Data converted from raw counts to science units, calibrated for instrument effects and precisely time-tagged. ATL02 provides the position and pointing data needed to precisely geolocate each photon. ATL02 is of limited use to the science community. EARTH SCIENCE > SPECTRAL/ENGINEERING > INFRARED WAVELENGTHS > SENSOR COUNTS > NONE > NONE > Photons NASA/GCMD Science Keywords Cite these data in publications as follows: The data used in this study were produced by the ICESat-2 Science Project Office at NASA/GSFC. The data archive site is the NASA National Snow and Ice Data Center Distributed Active Archive Center. 1B http://nsidc.org/data/icesat2/data.html ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 ATLAS > Advanced Topographic Laser Altimeter System ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 Spacecraft 2026-05-05T12:55:41Z 3.21.1 3.21.1 libdap-3.21.1 build_dmrpp -f /Users/myang6/work/opendap/hyrax-2144/ATL02_20221231235632_01741814_006_01.h5 -r ATL02_20221231235632_01741814_006_01.h5.dmr -u OPeNDAP_DMRpp_DATA_ACCESS_URL -M Release Number 1 Operations auxiliaryInformation Release number of the granule. The release number is incremented when the software or ancillary data used to create the granule has been changed. Ending Geolocation Segment 1 Derived auxiliaryInformation The ending geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation. Version 1 Operations auxiliaryInformation Version number of this granule within the release. It is a sequential number corresponding to the number of times the granule has been reprocessed for the current release. Ending Region 1 Derived auxiliaryInformation The ending product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. ATLAS Epoch Offset seconds since 1980-01-06T00:00:00.000000Z Operations auxiliaryInformation Number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch (2018-01-01:T00.00.00.000000 UTC). Add this value to delta time parameters to compute full gps_seconds (relative to the GPS epoch) for each data point. Ending Reference Groundtrack 1 Derived 1 1387 auxiliaryInformation The ending reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. ATLAS End Time (Actual) time seconds since 2018-01-01 Derived auxiliaryInformation Number of GPS seconds since the ATLAS SDP epoch at the last data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Ending Orbit Number 1 Derived auxiliaryInformation The ending orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. Starting Cycle 1 Derived 0 99 auxiliaryInformation The starting cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. End UTC Time of Granule (CCSDS-A, Actual) 1 Derived auxiliaryInformation UTC (in CCSDS-A format) of the last data point within the granule. Control File 1 Operations auxiliaryInformation PGE-specific control file used to generate this granule. To re-use, replace breaks (BR) with linefeeds. Start GPS SOW of Granule (Actual) seconds Derived auxiliaryInformation GPS seconds-of-week of the first data point in the granule. End UTC Time of Granule (CCSDS-A, Requested) 1 Derived auxiliaryInformation Requested end time (in UTC CCSDS-A) of this granule. Ending Cycle 1 Derived 0 99 auxiliaryInformation The ending cycle number associated with the data contained within this granule. The cycle number is the counter of the number of 91-day repeat cycles completed by the mission. Start UTC Time of Granule (CCSDS-A, Requested) 1 Derived auxiliaryInformation Requested start time (in UTC CCSDS-A) of this granule. ATLAS Start Time (Actual) time seconds since 2018-01-01 Derived auxiliaryInformation Number of GPS seconds since the ATLAS SDP epoch at the first data point in the file. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Starting Geolocation Segment 1 Derived auxiliaryInformation The starting geolocation segment number associated with the data contained within this granule. ICESat granule geographic regions are further refined by geolocation segments. During the geolocation process, a geolocation segment is created approximately every 20m from the start of the orbit to the end. The geolocation segments help align the ATLAS strong a weak beams and provide a common segment length for the L2 and higher products. The geolocation segment indices differ slightly from orbit-to-orbit because of the irregular shape of the Earth. The geolocation segment indices on ATL01 and ATL02 are only approximate because beams have not been aligned at the time of their creation. Starting Orbit Number 1 Derived auxiliaryInformation The starting orbit number associated with the data contained within this granule. The orbit number increments each time the spacecraft completes a full orbit of the Earth. Start UTC Time of Granule (CCSDS-A, Actual) 1 Derived auxiliaryInformation UTC (in CCSDS-A format) of the first data point within the granule. Ending GPSWeek of Granule (Actual) weeks from 1980-01-06 Derived auxiliaryInformation GPS week number of the last data point in the granule. Starting Reference Groundtrack 1 Derived 1 1387 auxiliaryInformation The starting reference groundtrack (RGT) number associated with the data contained within this granule. There are 1387 reference groundtrack in the ICESat-2 repeat orbit. The reference groundtrack increments each time the spacecraft completes a full orbit of the Earth and resets to 1 each time the spacecraft completes a full cycle. Ending GPS SOW of Granule (Actual) seconds Derived auxiliaryInformation GPS seconds-of-week of the last data point in the granule. QA Along-Track Interval 1 control auxiliaryInformation Statistics time interval for along-track QA data. Starting Region 1 Derived auxiliaryInformation The starting product-specific region number associated with the data contained within this granule. ICESat-2 data products are separated by geographic regions. The data contained within a specific region are the same for ATL01 and ATL02. ATL03 regions differ slightly because of different geolocation segment locations caused by the irregular shape of the Earth. The region indices for other products are completely independent. Start GPSWeek of Granule (Actual) weeks from 1980-01-06 Derived auxiliaryInformation GPS week number of the first data point in the granule. Contains information ancillary to the data product. This may include product characteristics, instrument characteristics and/or processing constants. Data within this group pertain to the granule in its entirety. Channel 1 Dimension Scale 1 20 referenceInformation Dimension scale for ATLAS PCE channels (1-16=strong, 17-20=weak) 1 Fine Counts Dimension Scale 0 74 referenceInformation Dimension scale for ATLAS Time-of-flight fine counts. This group contains calibrations derived from the ATLAS CAL products. ds_channel ds_fine_counts Base Temperature degC CAL54 auxiliaryInformation Base temperature coefficient. CAL File Name 1 CAL54 auxiliaryInformation Name of source file containing the calibration data Laser Internal Coeffs 1 CAL54 auxiliaryInformation Internal laser monitor coefficients (a_(J),b0_(J/count),b1_(J/degC_count),c0_(J/count^2),c1_(J/degC_count^2),d_(J/count^3),e_(J/count^4),std_of_residuals) LRS Coeffs 1 CAL54 auxiliaryInformation LRS coefficients a_(J),b0_(J/count),b1_(J/degC_count),c0_(J/count^2),c1_(J/degC_count^2),d_(J/count^3),e_(J/count^4),std_of_residuals SPD Coeffs 1 CAL54 auxiliaryInformation SPD laser monitor coefficients a_(J),b0_(J/count),b1_(J/degC_count),c0_(J/count^2),c1_(J/degC_count^2),d_(J/count^3),e_(J/count^4),std_of_residuals Contains CAL54 - absolute, energy monitor Histogram Bin X Values 1 CAL20 auxiliaryInformation Histogram bin x-values Laser 1 CAL20 auxiliaryInformation Laser Number Laser Power Setting 1 CAL20 auxiliaryInformation Laser Power Setting Return Source 1 CAL20 0 3 auxiliaryInformation Source of the events from which the data are derived. none tep maat echo 0 1 2 3 CAL Product Name 1 CAL20 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Number of Bins 1 CAL20 auxiliaryInformation Number of bins in the histogram Temperature degreesC auxiliaryInformation Temperature for which calibrations are provided. CAL20 Bin Width seconds CAL20 auxiliaryInformation Histogram bin width A_or_B 1 CAL20 1 2 auxiliaryInformation A or B Side Component A B 1 2 CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections. Histogram 1 CAL20 auxiliaryInformation Per-Channel Histogram Total Events 1 CAL20 auxiliaryInformation Number of events used in constructing the per-channel histogram CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections. Histogram 1 CAL20 auxiliaryInformation Per-Channel Histogram Total Events 1 CAL20 auxiliaryInformation Number of events used in constructing the per-channel histogram CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections. Histogram 1 CAL20 auxiliaryInformation Per-Channel Histogram Total Events 1 CAL20 auxiliaryInformation Number of events used in constructing the per-channel histogram CAL20 - System low link impulse response. Calibrates receiver impulse response, including optical and electrically introduced reflections. Elevation microradians CAL47_IMG auxiliaryInformation Elevation Azimuth microradians CAL47_IMG auxiliaryInformation Azimuth Azimuth Grid Range microradians CAL47_IMG auxiliaryInformation Azimuth Grid Range CAL Product Name 1 CAL47_IMG auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Temperature degC CAL47_IMG auxiliaryInformation Reference temperature within the CAL47 product. Grid Spacing microradians CAL47_IMG auxiliaryInformation GridSpacing Elevation Grid Range microradians CAL47_IMG auxiliaryInformation Elevation Grid Range elevation azimuth CAL47 - Provides a calibration for Receiver Sensitivity as a function of Transmit-to-Receiver Beam Misalignment. Relative intensity 1 CAL47_IMG auxiliaryInformation Strong spot relative intensity Relative intensity 1 CAL47_IMG auxiliaryInformation Weak spot relative intensity CAL47 - Rx Sensitivity as a function of TX-to-IFOV Misalignments. Correlates the residual misalignment of the total 6 beams (given the single BSM AZ/El mirror) interspersed among AMCS calibrations, to apparent shifts in signal gain. Relative intensity 1 CAL47_IMG auxiliaryInformation Strong spot relative intensity Relative intensity 1 CAL47_IMG auxiliaryInformation Weak spot relative intensity CAL47 - Rx Sensitivity as a function of TX-to-IFOV Misalignments. Correlates the residual misalignment of the total 6 beams (given the single BSM AZ/El mirror) interspersed among AMCS calibrations, to apparent shifts in signal gain. Relative intensity 1 CAL47_IMG auxiliaryInformation Strong spot relative intensity Relative intensity 1 CAL47_IMG auxiliaryInformation Weak spot relative intensity CAL47 - Rx Sensitivity as a function of TX-to-IFOV Misalignments. Correlates the residual misalignment of the total 6 beams (given the single BSM AZ/El mirror) interspersed among AMCS calibrations, to apparent shifts in signal gain. CAL49 - Receiver Channel Skews. Timing skews for every rising/fall channel on ATLAS. CAL Product Name 1 CAL49 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Skew_Fall seconds CAL49 auxiliaryInformation Per-channel skew (Fall) Skew_Fall StdErr seconds CAL49 auxiliaryInformation Standard error of the calculated skew (Fall) Skew_Rise seconds CAL49 auxiliaryInformation Per-channel skew (Rise) Skew_Rise StdErr seconds CAL49 auxiliaryInformation Standard error of the calculated skew (Rise) Primary_Redundant 1 CAL49 1 2 auxiliaryInformation Primary or Redundant Component PRIM REDU 1 2 Temperature degreesC CAL49 auxiliaryInformation Temperature for which calibrations are retrieved. CAL49 - Receiver Channel Skews. Timing skews for every rising/fall channel on ATLAS. CAL Product Name 1 CAL49 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Skew_Fall seconds CAL49 auxiliaryInformation Per-channel skew (Fall) Skew_Fall StdErr seconds CAL49 auxiliaryInformation Standard error of the calculated skew (Fall) Skew_Rise seconds CAL49 auxiliaryInformation Per-channel skew (Rise) Skew_Rise StdErr seconds CAL49 auxiliaryInformation Standard error of the calculated skew (Rise) Primary_Redundant 1 CAL49 1 2 auxiliaryInformation Primary or Redundant Component PRIM REDU 1 2 Temperature degreesC CAL49 auxiliaryInformation Temperature for which calibrations are retrieved. CAL49 - Receiver Channel Skews. Timing skews for every rising/fall channel on ATLAS. CAL Product Name 1 CAL49 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Skew_Fall seconds CAL49 auxiliaryInformation Per-channel skew (Fall) Skew_Fall StdErr seconds CAL49 auxiliaryInformation Standard error of the calculated skew (Fall) Skew_Rise seconds CAL49 auxiliaryInformation Per-channel skew (Rise) Skew_Rise StdErr seconds CAL49 auxiliaryInformation Standard error of the calculated skew (Rise) Primary_Redundant 1 CAL49 1 2 auxiliaryInformation Primary or Redundant Component PRIM REDU 1 2 Temperature degreesC CAL49 auxiliaryInformation Temperature for which calibrations are retrieved. CAL49 - Receiver Channel Skews. Timing skews for every rising/fall channel on ATLAS. CAL Product Name 1 CAL34 auxiliaryInformation Name of ATLAS CAL Products containing the calibration data Radiometric Correction 1 CAL34 auxiliaryInformation Radiometric Correction (width, strength, deadtime) Strong Beam Strength events/shot CAL34 auxiliaryInformation Strong spot strength in events/shot (strength, deadtime) Dead Time ns CAL34 auxiliaryInformation Dead time value Weak Beam Strength events/shot CAL34 auxiliaryInformation Weak spot strength in events/shot (strength, deadtime) Apparent Width ns CAL34 auxiliaryInformation Apparent width (width, deadtime) CAL34 - Dead-time Radiometric Signal Loss. Contains a table of radiometric corrections versus apparent return strength and width for several dead-time values. Correction is to be multiplied by raw return strength to get corrected return strength Dead Time ns Derived auxiliaryInformation Dead time value CAL Product Name 1 Derived auxiliaryInformation Name of ATLAS CAL Products containing the calibration data Strong Beam Strength events/shot Derived auxiliaryInformation Strong spot strength in events/shot (strength, deadtime) Weak Beam Strength events/shot Derived auxiliaryInformation Weak spot strength in events/shot (strength, deadtime) FFB Correction 1 Derived auxiliaryInformation First Photon Bias Correction (width, strength, deadtime) Apparent Width ns Derived auxiliaryInformation Apparent width (width, deadtime) CAL19 -First Photon Bias. Provides a correction for first photon bias. CAL Product Name 1 CAL17 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data CAL17 - PCE Effective Cell Delay. Calibration product for PCE Unit Cell Delay -- a matrix of effective fine counts as a function of temperature, voltage, PCE card, channel, and event edge (rising, falling). Temperature degreesC CAL17 auxiliaryInformation Temperature for which calibrations are provided. EFC Falling counts CAL17 auxiliaryInformation Effective Rx falling fine cell count (cell, channel, temp) Call Rising 1 CAL17 auxiliaryInformation Cal_rise value which calibrations are provided (index to raw_cal_rise/256) EFC LL counts CAL17 auxiliaryInformation Effective Tx fine cell count for leading lower (cell, temp) EFC Rising counts CAL17 auxiliaryInformation Effective rising Rx fine cell count (cell, channel, temp) EFC Other counts CAL17 auxiliaryInformation Effective Tx fine cell count for other (cell, temp) Call Falling 1 CAL17 auxiliaryInformation Cal_fall value which calibrations are provided (indexed by raw_cal_fall/256) temperature CAL17 - PCE Effective Cell Delay. Calibration product for PCE Unit Cell Delay -- a matrix of effective fine counts as a function of temperature, voltage, PCE card, channel, and event edge (rising, falling). Temperature degreesC CAL17 auxiliaryInformation Temperature for which calibrations are provided. EFC Falling counts CAL17 auxiliaryInformation Effective Rx falling fine cell count (cell, channel, temp) Call Rising 1 CAL17 auxiliaryInformation Cal_rise value which calibrations are provided (index to raw_cal_rise/256) EFC LL counts CAL17 auxiliaryInformation Effective Tx fine cell count for leading lower (cell, temp) EFC Rising counts CAL17 auxiliaryInformation Effective rising Rx fine cell count (cell, channel, temp) EFC Other counts CAL17 auxiliaryInformation Effective Tx fine cell count for other (cell, temp) Call Falling 1 CAL17 auxiliaryInformation Cal_fall value which calibrations are provided (indexed by raw_cal_fall/256) temperature CAL17 - PCE Effective Cell Delay. Calibration product for PCE Unit Cell Delay -- a matrix of effective fine counts as a function of temperature, voltage, PCE card, channel, and event edge (rising, falling). Temperature degreesC CAL17 auxiliaryInformation Temperature for which calibrations are provided. EFC Falling counts CAL17 auxiliaryInformation Effective Rx falling fine cell count (cell, channel, temp) Call Rising 1 CAL17 auxiliaryInformation Cal_rise value which calibrations are provided (index to raw_cal_rise/256) EFC LL counts CAL17 auxiliaryInformation Effective Tx fine cell count for leading lower (cell, temp) EFC Rising counts CAL17 auxiliaryInformation Effective rising Rx fine cell count (cell, channel, temp) EFC Other counts CAL17 auxiliaryInformation Effective Tx fine cell count for other (cell, temp) Call Falling 1 CAL17 auxiliaryInformation Cal_fall value which calibrations are provided (indexed by raw_cal_fall/256) temperature CAL17 - PCE Effective Cell Delay. Calibration product for PCE Unit Cell Delay -- a matrix of effective fine counts as a function of temperature, voltage, PCE card, channel, and event edge (rising, falling). CAL Product Name 1 CAL30 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Detector Bank Side 1 CAL30 1 2 auxiliaryInformation A or B side of the detector bank A B 1 2 CAL30 - Nominal Rx Sensitivity. Receiver radiometric sensitivity, in an absolute measurement, with all variables (temperature, bias, alignment) set to nominal values. RMS Residual 1 CAL30 auxiliaryInformation Strong spot RMS Residual fraction RMS Residual 1 CAL30 auxiliaryInformation Weak spot RMS Residual fraction sdev_strong counts/s/pW CAL30 auxiliaryInformation Strong spot standard deviation Slope counts/s/pW CAL30 auxiliaryInformation Strong spot Slope sdev_weak counts/s/pW CAL30 auxiliaryInformation Weak spot standard deviation Slope counts/s/pW CAL30 auxiliaryInformation Weak spot Slope CAL30 - Nominal Rx Sensitivity. Receiver radiometric sensitivity, in an absolute measurement, with all variables (temperature, bias, alignment ) set to nominal values. RMS Residual 1 CAL30 auxiliaryInformation Strong spot RMS Residual fraction RMS Residual 1 CAL30 auxiliaryInformation Weak spot RMS Residual fraction sdev_strong counts/s/pW CAL30 auxiliaryInformation Strong spot standard deviation Slope counts/s/pW CAL30 auxiliaryInformation Strong spot Slope sdev_weak counts/s/pW CAL30 auxiliaryInformation Weak spot standard deviation Slope counts/s/pW CAL30 auxiliaryInformation Weak spot Slope CAL30 - Nominal Rx Sensitivity. Receiver radiometric sensitivity, in an absolute measurement, with all variables (temperature, bias, alignment ) set to nominal values. RMS Residual 1 CAL30 auxiliaryInformation Strong spot RMS Residual fraction RMS Residual 1 CAL30 auxiliaryInformation Weak spot RMS Residual fraction sdev_strong counts/s/pW CAL30 auxiliaryInformation Strong spot standard deviation Slope counts/s/pW CAL30 auxiliaryInformation Strong spot Slope sdev_weak counts/s/pW CAL30 auxiliaryInformation Weak spot standard deviation Slope counts/s/pW CAL30 auxiliaryInformation Weak spot Slope CAL30 - Nominal Rx Sensitivity. Receiver radiometric sensitivity, in an absolute measurement, with all variables (temperature, bias, alignment ) set to nominal values. CAL File Name 1 CAL45 auxiliaryInformation Name of source file containing the calibration data Energy Fraction 1 CAL45 auxiliaryInformation Energy Fraction, Per Spot Optics Throughput 1 CAL45 auxiliaryInformation Optics Throughput, Per PCE Contains CAL45 data - Transmit Energy Fraction per Beam Laser 1 CAL61 auxiliaryInformation Laser Number Laser Power Setting 1 CAL61 auxiliaryInformation Laser Power Setting Temperature degreesC CAL61 auxiliaryInformation Temperature for which calibrations are provided. CAL Product Name 1 CAL61 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Detector Bank Side 1 CAL61 1 2 auxiliaryInformation A or B side of the detector bank A B 1 2 CAL61 - Rx Sensitivity vs. WTOM Ratio. Provides parameter values, for each spot, for the fit of Relative Sensitivity based on the reported WTEM through a quadratic curve. h_strong 1 CAL61 auxiliaryInformation h_strong; used in Eqn 5-17. rms_of_fit_strong 1 CAL61 auxiliaryInformation rms_of_fit_strong ypeak_strong counts/s CAL61 auxiliaryInformation ypeak_strong sdev_ypeak_weak counts/s CAL61 auxiliaryInformation sdev_ypeak_weak sdev_xpeak_weak 1 CAL61 auxiliaryInformation sdev_xpeak_weak xpeak_weak 1 CAL61 auxiliaryInformation xpeak_weak; used in Eqn 5-17. h_weak 1 CAL61 auxiliaryInformation h_weak; used in Eqn 5-17. sdev_ypeak_strong counts/s CAL61 auxiliaryInformation sdev_ypeak_strong ypeak_weak counts/s CAL61 auxiliaryInformation ypeak_weak xpeak_strong 1 CAL61 auxiliaryInformation xpeak_strong; used in Eqn 5-17. rms_of_fit_weak 1 CAL61 auxiliaryInformation rms_of_fit_weak sdev_xpeak_strong 1 CAL61 auxiliaryInformation sdev_xpeak_strong sdev_h_weak 1 CAL61 auxiliaryInformation sdev_h_weak sdev_h_strong 1 CAL61 auxiliaryInformation sdev_h_strong CAL61 - Rx Sensitivity vs. WTOM Ratio. Calibration of receiver throughput as a function of the WTOM/WTEM diode signals (D1, D2) to indicate quality of the spectral tuning of the OFMs (etalons) for each receiver IFOV. h_strong 1 CAL61 auxiliaryInformation h_strong; used in Eqn 5-17. rms_of_fit_strong 1 CAL61 auxiliaryInformation rms_of_fit_strong ypeak_strong counts/s CAL61 auxiliaryInformation ypeak_strong sdev_ypeak_weak counts/s CAL61 auxiliaryInformation sdev_ypeak_weak sdev_xpeak_weak 1 CAL61 auxiliaryInformation sdev_xpeak_weak xpeak_weak 1 CAL61 auxiliaryInformation xpeak_weak; used in Eqn 5-17. h_weak 1 CAL61 auxiliaryInformation h_weak; used in Eqn 5-17. sdev_ypeak_strong counts/s CAL61 auxiliaryInformation sdev_ypeak_strong ypeak_weak counts/s CAL61 auxiliaryInformation ypeak_weak xpeak_strong 1 CAL61 auxiliaryInformation xpeak_strong; used in Eqn 5-17. rms_of_fit_weak 1 CAL61 auxiliaryInformation rms_of_fit_weak sdev_xpeak_strong 1 CAL61 auxiliaryInformation sdev_xpeak_strong sdev_h_weak 1 CAL61 auxiliaryInformation sdev_h_weak sdev_h_strong 1 CAL61 auxiliaryInformation sdev_h_strong CAL61 - Rx Sensitivity vs. WTOM Ratio. Calibration of receiver throughput as a function of the WTOM/WTEM diode signals (D1, D2) to indicate quality of the spectral tuning of the OFMs (etalons) for each receiver IFOV. h_strong 1 CAL61 auxiliaryInformation h_strong; used in Eqn 5-17. rms_of_fit_strong 1 CAL61 auxiliaryInformation rms_of_fit_strong ypeak_strong counts/s CAL61 auxiliaryInformation ypeak_strong sdev_ypeak_weak counts/s CAL61 auxiliaryInformation sdev_ypeak_weak sdev_xpeak_weak 1 CAL61 auxiliaryInformation sdev_xpeak_weak xpeak_weak 1 CAL61 auxiliaryInformation xpeak_weak; used in Eqn 5-17. h_weak 1 CAL61 auxiliaryInformation h_weak; used in Eqn 5-17. sdev_ypeak_strong counts/s CAL61 auxiliaryInformation sdev_ypeak_strong ypeak_weak counts/s CAL61 auxiliaryInformation ypeak_weak xpeak_strong 1 CAL61 auxiliaryInformation xpeak_strong; used in Eqn 5-17. rms_of_fit_weak 1 CAL61 auxiliaryInformation rms_of_fit_weak sdev_xpeak_strong 1 CAL61 auxiliaryInformation sdev_xpeak_strong sdev_h_weak 1 CAL61 auxiliaryInformation sdev_h_weak sdev_h_strong 1 CAL61 auxiliaryInformation sdev_h_strong CAL61 - Rx Sensitivity vs. WTOM Ratio. Calibration of receiver throughput as a function of the WTOM/WTEM diode signals (D1, D2) to indicate quality of the spectral tuning of the OFMs (etalons) for each receiver IFOV. LU-LL1 seconds CAL44 auxiliaryInformation LU-LL1 LL3-LL1 seconds CAL44 auxiliaryInformation LL3-LL1 LL2-LL1 seconds CAL44 auxiliaryInformation LL2-LL1 LL1 seconds CAL44 auxiliaryInformation Leading Lower Skew, PCE1 CAL Product Name 1 CAL44 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data TL-LL3 seconds CAL44 auxiliaryInformation TL-LL3 SPD Side 1 CAL44 1 2 auxiliaryInformation A or B side of the Start Pulse Detector A B 1 2 SPD_Temp degreesC CAL44 auxiliaryInformation SPD Temperature TU-LL2 CAL44 auxiliaryInformation TU-LL2 seconds CAL44 - Start Timing Skews. Produces START pulse timing skews within & among PCEs to properly align all start pulse timing channels. CAL Product Name 1 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data CAL42 Temperature degreesC CAL42 auxiliaryInformation Temperature for which calibrations are provided. Detector Bank Side 1 CAL42 1 2 auxiliaryInformation A or B side of the detector bank A B 1 2 CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis. DeadTime seconds CAL42 auxiliaryInformation Dead Time (channel) Sigma seconds CAL42 auxiliaryInformation Sigma (channel) CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis. DeadTime seconds CAL42 auxiliaryInformation Dead Time (channel) Sigma seconds CAL42 auxiliaryInformation Sigma (channel) CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis. DeadTime seconds CAL42 auxiliaryInformation Dead Time (channel) Sigma seconds CAL42 auxiliaryInformation Sigma (channel) CAL42 - Dead-time. Estimates dead time for each ATLAS receiver channel accompanied by an estimated standard deviation for that measurement. photoelectrons/spot/shot, channel-to-channel basis. CAL Product Name 1 CAL46 auxiliaryInformation Name of ATLAS CAL Product containing the calibration data Detector Bank Side 1 CAL46 1 2 auxiliaryInformation A or B side of the detector bank A B 1 2 CAL46 - Relationship describing detector responsivity as the PMT high voltage deviates from nominal high voltage setting (V0). r_nom 1 CAL46 auxiliaryInformation Weak spot Rnom npoints_weak 1 CAL46 auxiliaryInformation Weak spot number of points sigma_fit_weak 1 CAL46 auxiliaryInformation Weak spot sigma of fit sigma_b_strong 1/v auxiliaryInformation Strong spot sigma of coefficient b CAL46 v_nom v CAL46 auxiliaryInformation Strong spot nominal voltage sigma_fit_strong 1 CAL46 auxiliaryInformation Strong spot sigma of fit sigma_c_weak 1/v^2 CAL46 auxiliaryInformation Weak spot sigma of coefficient c c_strong 1/v^2 CAL46 auxiliaryInformation Strong spot coefficient c b_weak 1/v CAL46 auxiliaryInformation Weak spot coefficient b sigma_b_weak 1/v CAL46 auxiliaryInformation Weak spot sigma of coefficient b sigma_c_strong 1/v^2 CAL46 auxiliaryInformation Strong spot sigma of coefficient c r_nom 1 CAL46 auxiliaryInformation Strong spot Rnom v_nom v CAL46 auxiliaryInformation Weak spot nominal voltage b_strong 1/v CAL46 auxiliaryInformation Strong spot coefficient b c_weak 1/v^2 CAL46 auxiliaryInformation Weak spot coefficient c npoints_strong 1 CAL46 auxiliaryInformation Strong spot number of points CAL46 - Per-PCE. r_nom 1 CAL46 auxiliaryInformation Weak spot Rnom npoints_weak 1 CAL46 auxiliaryInformation Weak spot number of points sigma_fit_weak 1 CAL46 auxiliaryInformation Weak spot sigma of fit sigma_b_strong 1/v auxiliaryInformation Strong spot sigma of coefficient b CAL46 v_nom v CAL46 auxiliaryInformation Strong spot nominal voltage sigma_fit_strong 1 CAL46 auxiliaryInformation Strong spot sigma of fit sigma_c_weak 1/v^2 CAL46 auxiliaryInformation Weak spot sigma of coefficient c c_strong 1/v^2 CAL46 auxiliaryInformation Strong spot coefficient c b_weak 1/v CAL46 auxiliaryInformation Weak spot coefficient b sigma_b_weak 1/v CAL46 auxiliaryInformation Weak spot sigma of coefficient b sigma_c_strong 1/v^2 CAL46 auxiliaryInformation Strong spot sigma of coefficient c r_nom 1 CAL46 auxiliaryInformation Strong spot Rnom v_nom v CAL46 auxiliaryInformation Weak spot nominal voltage b_strong 1/v CAL46 auxiliaryInformation Strong spot coefficient b c_weak 1/v^2 CAL46 auxiliaryInformation Weak spot coefficient c npoints_strong 1 CAL46 auxiliaryInformation Strong spot number of points CAL46 - Per-PCE. r_nom 1 CAL46 auxiliaryInformation Weak spot Rnom npoints_weak 1 CAL46 auxiliaryInformation Weak spot number of points sigma_fit_weak 1 CAL46 auxiliaryInformation Weak spot sigma of fit sigma_b_strong 1/v auxiliaryInformation Strong spot sigma of coefficient b CAL46 v_nom v CAL46 auxiliaryInformation Strong spot nominal voltage sigma_fit_strong 1 CAL46 auxiliaryInformation Strong spot sigma of fit sigma_c_weak 1/v^2 CAL46 auxiliaryInformation Weak spot sigma of coefficient c c_strong 1/v^2 CAL46 auxiliaryInformation Strong spot coefficient c b_weak 1/v CAL46 auxiliaryInformation Weak spot coefficient b sigma_b_weak 1/v CAL46 auxiliaryInformation Weak spot sigma of coefficient b sigma_c_strong 1/v^2 CAL46 auxiliaryInformation Strong spot sigma of coefficient c r_nom 1 CAL46 auxiliaryInformation Strong spot Rnom v_nom v CAL46 auxiliaryInformation Weak spot nominal voltage b_strong 1/v CAL46 auxiliaryInformation Strong spot coefficient b c_weak 1/v^2 CAL46 auxiliaryInformation Weak spot coefficient c npoints_strong 1 CAL46 auxiliaryInformation Strong spot number of points CAL46 - Per-PCE. AMCS Bias Offset Y microradians ANC27 (ATBD Section 5.3.3.1) auxiliaryInformation Zero is center of BSM range: (x,y)=(8000,8000). Used in Eqn 5-13 to generate coordinates that are used in Eqn 5-11 to interpolate CAL 47, which has 1 R grid spacing. WTOM Wavelength Offset 1 auxiliaryInformation WTOM Wavelength Offset. Currently zero. An "off-tuning" value to be used with alternate tuning; method for calculating not defined. ANC27 (ATBD Section 5.3.3.2) Start Time Coefficients ns ANC27 (ATBD Section 3.5.6) auxiliaryInformation Start time coefficients for TOF center correction (coefficent x scenario) AMCS Bias Offset X microradians ANC27 (ATBD Section 5.3.3.1) auxiliaryInformation Zero is center of BSM range: (x,y)=(8000,8000). Used in Eqn 5-13 to generate coordinates that are used in Eqn 5-11 to interpolate CAL 47, which has 1 R grid spacing. WTOM Tuning Flag 1 ANC27 (ATBD Section 5.3.3.2) 1 2 auxiliaryInformation WTOM Tuning Flag (1=standard method, 2=alternate method) std alt 1 2 CAL46 Aging Factor 1 ANC27 (ATBD Section 5.3.14) auxiliaryInformation CAL46 Aging correction factor AMCS Bias Time seconds since 2018-01-01 ANC27 (ATBD Section 5.3.3.1) auxiliaryInformation Times of surrounding AMCS bias corrections WTOM Alt Tuning Correction 1 ANC27 (ATBD Section 5.3.3.2) auxiliaryInformation W" in Eqn 5-15. Used only for alternate tuning; method for calculating not defined. USO Frequence Deviation hz ANC27 auxiliaryInformation USO frequency deviation; Used in Eqn 2-4. AMCS bias rate microradians/undefined_time ANC27 (ATBD Section 5.3.3.1) auxiliaryInformation Currently a placeholder, not used in calculations. Constants and calibrations provided by the ICESat-2 Instrument Support Facility (via ANC27) HVPC Side, A or B 1 Derived, L1B ATBD 1 2 auxiliaryInformation Indicates if the active High Voltage Power Converter (HVPC) is side A (1) or side B (2). a b 1 2 Detector Side, A or B 1 Derived, L1B ATBD 1 2 auxiliaryInformation Indicates if the active detector (DET) is side A (1) or side B (2). a b 1 2 Laser 1 or Laser 2 1 1 2 auxiliaryInformation Indicates if the active Laser is laser 1 or laser 2. 1 2 1 2 Derived, L1B ATBD LRS Side A or B 1 Derived, L1B ATBD 1 2 auxiliaryInformation Indicates if the active LRS is side A (1) or side B (2). a b 1 2 PDU Side A or B 1 2 auxiliaryInformation Indicates if the active PDU is side a (1) or side b (2). a b 1 2 Derived, L1B ATBD 1 SPD A or B 1 Derived, L1B ATBD 1 2 auxiliaryInformation Indicates if the active Start Pulse Detector (SPD) is side a (1) or side b (2). a b 1 2 TAMS Side A or B 1 Derived, L1B ATBD 1 2 auxiliaryInformation Indicates if the active TAMS is side a (1) or side b (2). a b 1 2 Constants and calibrations related to ATLAS housekeeping data. TEP flag for PCE1. 1 ATLAS L1B ATBD 0 1 auxiliaryInformation Flag indicating that the PCE1 strong channels should be checked for TEP events. Default value is 1 (indicating that TEP is possible on PCE1). A value of 0 indicates that PCE1 data are not examined for TEP. do_not_check check 0 1 TEP flag for PCE2. 1 ATLAS L1B ATBD 0 1 auxiliaryInformation Flag indicating that the PCE2 strong channels should be checked for TEP events. Default value is 1 (indicating that TEP is possible on PCE2). A value of 0 indicates that PCE2 data are not examined for TEP. do_not_check check 0 1 TEP flag for PCE3. 1 ATLAS L1B ATBD 0 1 auxiliaryInformation Flag indicating that the PCE3 strong channels should be checked for TEP events. Default value is 0 (indicating that TEP is not possible on PCE3). A value of 1 indicates that PCE3 data are examined for TEP (even though the hardware does not support this possibility). do_not_check check 0 1 TEP Detection Maximum seconds ATLAS L1B ATBD auxiliaryInformation Maximum value used to classify TEP photons. Default value per ATBD is 100ns. (100e-9 sec) TEP Detection Minimum seconds auxiliaryInformation Minimum value used to classify TEP photons. Default value per ATBD is 0ns. (0e-9 sec) ATLAS L1B ATBD Contains ancillary values related to TEP detection. LRS Clock Rate seconds/count ATLAS L1B ATBD auxiliaryInformation The nominal rate of the LRS internal 27 MHz oscillator (divided by 32). Correction value for PCE3 Rx coarse clock offset counts ATLAS L1B ATBD auxiliaryInformation Correction for the PCE3 Receive coarse clock offset. This corrects for the offset between the actual number of coarse clock cycles and the reported number of coarse clock cycles (for each channel). Default value is -1. Size of TOF Histogram Windows seconds ATLAS L1B ATBD, auxiliaryInformation Size of the TxRx slip detection windows within the peak-aligned, windowed TOF histograms. Duration of TOF Histogram Window seconds ATLAS L1B ATBD, auxiliaryInformation Duration of peak-aligned, windowed TOF histograms. T0 Clock Tick seconds/count ATLAS L1B ATBD, Section 4.2.1 auxiliaryInformation T0 clock tick. TOF Histogram Bin Size seconds ATLAS L1B ATBD, auxiliaryInformation Binsize of peak-aligned, windowed TOF histograms. Center of TOF Histogram Lower Window seconds ATLAS L1B ATBD, auxiliaryInformation Center of the lower TxRx slip detection window within the peak-aligned, windowed TOF histograms. Center of TOF Histogram Upper Window seconds ATLAS L1B ATBD, auxiliaryInformation Center of the upper TxRx slip detection window within the peak-aligned, windowed TOF histograms. Correction value for PCE2 Tx coarse clock offset counts ATLAS L1B ATBD auxiliaryInformation Correction for the PCE2 Transmit coarse clock offset. This corrects for the offset between the actual number of coarse clock cycles and the reported number of coarse clock cycles. Default value is -1. Correction value for PCE2 Rx coarse clock offset counts ATLAS L1B ATBD auxiliaryInformation Correction for the PCE2 Receive coarse clock offset. This corrects for the offset between the actual number of coarse clock cycles and the reported number of coarse clock cycles (for each channel). Default value is -1. USO (AMET) Clock Tick seconds/count ATLAS L1B ATBD, Section 4.2.1 auxiliaryInformation The AMET clock tick Minimum Confidence 1 ATLAS L1B ATBD, auxiliaryInformation Minimum TxRx histogram confidence level to fail a granule. IMET Clock Tick seconds/count ATLAS L1B ATBD, Section 4.2.1 auxiliaryInformation IMET clock tick. Correction value for PCE3 Tx coarse clock offset counts ATLAS L1B ATBD auxiliaryInformation Correction for the PCE3 Transmit coarse clock offset. This corrects for the offset between the actual number of coarse clock cycles and the reported number of coarse clock cycles. Default value is -1. Duplicate_Tolerance counts ATLAS L1B ATBD auxiliaryInformation Tolerance used when comparing fine counts within duplicate detection Discard_Short_MFrames 1 auxiliaryInformation If TRUE, discard the photons associated with major frames containing less than 199 Tx. ATLAS L1B ATBD, TXRX_Slip_Repair 1 ATLAS L1B ATBD, auxiliaryInformation If TRUE, attempt to repair any detected TXRX slip. Calibration value for USO 1 ATLAS L1B ATBD auxiliaryInformation Calibration value for the Ultra Stable Oscillator (USO). Computed using the number of coarse clock ticks measurement generated by the USO between sequential 1PPS time stamps from the on-orbit GPS to estimate the coarse clock ruler scale factor. Correction value for PCE1 Rx coarse clock offset counts ATLAS L1B ATBD auxiliaryInformation Correction for the PCE1 Receive coarse clock offset. This corrects for the offset between the actual number of coarse clock cycles and the reported number of coarse clock cycles (for each channel). Default value is -1. cal_risefall boxcar interval counts ATLAS L1B ATBD auxiliaryInformation Boxcar averaging interval for cal_risefall averaging, in major-frame counts. Boxcar averages are using to generate 1D spline coefficients. The spline coefficients are used to create smoothed, interpolated cal_risefall values at the full data rate. Correction value for PCE1 Tx coarse clock offset counts ATLAS L1B ATBD auxiliaryInformation Correction for the PCE1 Transmit coarse clock offset. This corrects for the offset between the actual number of coarse clock cycles and the reported number of coarse clock cycles. Default value is -1. Contains ancillary parameters related to Time-of-Flight and/or Time-of-Day calculations. Data within this group pertain to the granule in its entirety. Group contains the ATLAS EU-converted data Data within this group are stored at the nominal rate of the corresponding ATLAS APIDs (varies per APID). Group contains the ATLAS EU-converted housekeeping data Data within this group are stored at the nominal rate of the corresponding ATLAS APIDs (varies per APID). Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. The timestamp is computed based on the housekeeping design to sample laser near the asc 1pps internal pulse. (See the L1B ATBD section 5 Radiometric Corrections ) delta_time PCE3 Strong background sensitivity events/s/Watt ATBD Section 5.5.2 referenceInformation PCE3, Strong spot - receiver response per watt of continuous illumination in the passband from a diffuse source larger than the field of view, in the absence of any dead time effects. delta_time PCE1 Strong background sensitivity events/s/Watt ATBD Section 5.5.2 referenceInformation PCE1, Strong spot - receiver response per watt of continuous illumination in the passband from a diffuse source larger than the field of view, in the absence of any dead time effects. delta_time PCE3 Weak return sensitivity events/s/Watt ATBD Section 5.5.3 referenceInformation PCE3, Weak spot - receiver response per joule/return pulse in the field of view, in the absence of any deadtime effects. delta_time PCE3 Strong return sensitivity events/s/Watt ATBD Section 5.5.3 referenceInformation PCE3, Strong spot - receiver response per joule/return pulse in the field of view, in the absence of any deadtime effects. delta_time PCE2 Weak return sensitivity events/s/Watt ATBD Section 5.5.3 referenceInformation PCE2, Weak spot - receiver response per joule/return pulse in the field of view, in the absence of any deadtime effects. delta_time PCE2 Weak background sensitivity events/s/Watt ATBD Section 5.5.2 referenceInformation PCE2, Weak spot - receiver response per watt of continuous illumination in the passband from a diffuse source larger than the field of view, in the absence of any dead time effects. delta_time PCE1 Weak background sensitivity events/s/Watt ATBD Section 5.5.2 referenceInformation PCE1, Weak spot - receiver response per watt of continuous illumination in the passband from a diffuse source larger than the field of view, in the absence of any dead time effects. delta_time PCE1 Strong return sensitivity events/s/Watt ATBD Section 5.5.3 referenceInformation PCE1, Strong spot - receiver response per joule/return pulse in the field of view, in the absence of any deadtime effects. delta_time PCE3 Weak background sensitivity events/s/Watt ATBD Section 5.5.2 referenceInformation PCE3, Weak spot - receiver response per watt of continuous illumination in the passband from a diffuse source larger than the field of view, in the absence of any dead time effects. delta_time PCE1 Weak return sensitivity events/s/Watt ATBD Section 5.5.3 referenceInformation PCE1, Weak spot - receiver response per joule/return pulse in the field of view, in the absence of any deadtime effects. delta_time PCE2 Strong background sensitivity events/s/Watt ATBD Section 5.5.2 referenceInformation PCE2, Strong spot - receiver response per watt of continuous illumination in the passband from a diffuse source larger than the field of view, in the absence of any dead time effects. delta_time PCE2 Strong return sensitivity events/s/Watt ATBD Section 5.5.3 referenceInformation PCE2, Strong spot - receiver response per joule/return pulse in the field of view, in the absence of any deadtime effects. delta_time delta_time The radiometry group contains background and receiver sensitivity Data within this group are stored at the data rate of one hertz. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. The timestamp is computed based on the housekeeping design to sample laser near the asc 1pps internal pulse. (See the L1B ATBD section 5 Radiometric Corrections ) 3.402823466e+38 Spot laser energy for PCE3, weak joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE3 weak spot, derived from LRS laser centroids and split by calibration. delta_time degreesC 3.402823466e+38 Laser Temperature ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation LRS Temperature. From A_HKT_C Telemetry packet delta_time 3.402823466e+38 Spot laser energy for PCE3, strong joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE3 strong spot, derived from LRS laser centroids and split by calibration. delta_time 3.402823466e+38 total laser energy joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Total laser energy from derived from LRS laser centroid magnitudes. delta_time 3.402823466e+38 Spot laser energy for PCE1, strong joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE1 strong spot, derived from LRS laser centroids and split by calibration. delta_time 3.402823466e+38 Spot laser energy for PCE2, weak joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE2 weak spot, derived from LRS laser centroids and split by calibration. delta_time 3.402823466e+38 Spot laser energy for PCE2, strong joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE2 strong spot, derived from LRS laser centroids and split by calibration. delta_time 3.402823466e+38 Spot laser energy for PCE1, weak joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE1 weak spot, derived from LRS laser centroids and split by calibration. delta_time delta_time Laser energy derived from LRS Centroid Magnitudes. Packet Frequency is 50 Hertz. Data within this group are provided at the packet rate of 50hz. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. The timestamp is computed based on the housekeeping design to sample laser near the asc 1pps internal pulse. (See the L1B ATBD section 5 Radiometric Corrections ) DS for 10 measurements 1 ATLAS 1 10 referenceInformation Dimension scale for10 measurements. SPD Edge mV ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation edge_xmtnc. From Analog HK Telemetry packet E (APID 1063). delta_time joules Spot laser energy for PCE3, strong ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE3 strong spot, derived from the analog HK telemetry and split by calibration. delta_time total laser energy joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Total laser energy from Analog HK Telemetry packet E (APID 1063). delta_time Laser Temperature degreesC ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser Temperature. From A_HKT_C PRIMARY SPD THERMISTOR MED_34 chan[74] or REDUNDANT SPD THERMISTOR MED_35 chan[81] delta_time joules Spot laser energy for PCE1, strong ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE1 strong spot, derived from the analog HK telemetry and split by calibration. delta_time SPD Peak mV ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation peak_xmtnc. From Analog HK Telemetry packet E (APID 1063). delta_time joules Spot laser energy for PCE2, weak ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE2 weak spot, derived from the analog HK telemetry and split by calibration. delta_time SPD Lower Thres volts ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Start Pulse Detector (SPD) lower threshold readback value. Reported as an analog voltage whose nominal setting puts the threshold at 20% of full laser energy. From Analog HK Telemetry packet E (APID 1063). delta_time joules Spot laser energy for PCE2, strong ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE2 strong spot, derived from the analog HK telemetry and split by calibration. delta_time SPD Upper Thres volts ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Start Pulse Detector (SPD) upper threshold readback value. Reported as an analog voltage whose nominal setting puts the threshold at 80% of full laser energy. From Analog HK Telemetry packet E (APID 1063). delta_time joules Spot laser energy for PCE1, weak ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE1 weak spot derived from the analog HK telemetry and split by calibration. delta_time joules Spot laser energy for PCE3, weak ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE3 weak spot, derived from the analog HK telemetry and split by calibration. delta_time delta_time ds_10 Laser energy from APID 1063 Analog HK Telemetry. Packet Frequency is 1 Hertz. Data within this group are provided at the packet rate of 1hz. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. q_sc_i2b_2 1 ATL01/atlas/a_sc_pon_1138 -1. 1. referenceInformation SC Inertial to ATLAS Body Frame quaternion 2 delta_time x_sc_body_rate radians/second ATL01/atlas/a_sc_pon_1138 referenceInformation SC body rate as measured about the X axis in the ATLAS frame delta_time y_sc_body_rate ATL01/atlas/a_sc_pon_1138 referenceInformation SC body rate as measured about the Y axis in the ATLAS frame delta_time radians/second sc_solution_sec seconds ATL01/atlas/a_sc_pon_1138 referenceInformation Recorded time of the pointing solution in seconds from the spacecraft epoch delta_time sc_solution_subsec subseconds ATL01/atlas/a_sc_pon_1138 referenceInformation Spacecraft recorded time counts - 24 bits, 100 ns per count delta_time z_sc_body_rate radians/second ATL01/atlas/a_sc_pon_1138 referenceInformation SC body rate as measured about the Z axis in the ATLAS frame delta_time q_sc_i2b_3 1 ATL01/atlas/a_sc_pon_1138 -1. 1. referenceInformation SC Inertial to ATLAS Body Frame quaternion 3 delta_time q_sc_i2b_4 1 ATL01/atlas/a_sc_pon_1138 -1. 1. referenceInformation SC Inertial to ATLAS Body Frame quaternion 4 delta_time q_sc_i2b_1 1 ATL01/atlas/a_sc_pon_1138 -1. 1. referenceInformation SC Inertial to ATLAS Body Frame quaternion 1 delta_time delta_time APID 1138 ATLAS Pointing Message- Spacecraft Attitude and Rates Packet - Relayed to SSR. Packet Frequency is by command. Data within this group are stored at the data rate of the source APIDs. (only downlinked on command). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. This is computed based on the housekeeping design to sample a measurement every 0.003125 seconds from the internal ASC 1PPS . The time for this packet is set as the time of the lowest channel number in this telemetry packet.. If the specific time is needed use the channel number from the lowest channel in packet. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. HKT OFA6 PRI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-43 OFA6 PRI T - A_HKT_C.chan[24] delta_time HKT OB PZ2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Optical Bench, +Z Side T TCS-27 A_HKT_C.chan[64] delta_time HKT DOM RAD2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT DAA DOM Radiator T (Red) TCS-48 - A_HKT_C.chan[34] delta_time HKT MEB MCE2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB MCE2 T MEB-08 - A_HKT_C.chan[6] delta_time HKT OFA5 RED T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-42 OFA5 RED T - A_HKT_C.chan[30] delta_time HKT MEB PCE3 2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB PCE3 2 T MEB-16 - A_HKT_C.chan[14] delta_time HKT OB MZ2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Optical Bench, -Z Side T TCS-24 A_HKT_C.chan[66] delta_time HKT TEL PRI1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Telescope, Primary Mirror T (Pri) TCS-05 A_HKT_C.chan[95] delta_time HKT_DEM1_T2_IT_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 76 - DEM1_TH_D-MEB-39 Internal Top T A_HKT_C.chan[40] delta_time HKT_OB_PZ4_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Optical Bench +z4 T TCS_32 A_HKT_C.chan[105] delta_time HKT STRUC MY T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Structure Y Panel T TCS_55 A_HKT_C.chan[91] delta_time HKT LHP EVAP T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation LHP Evaporator T TCS-15 A_HKT_C.chan[54] delta_time HKT_DEM6_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 87 - DEM6_TH_A-MEB-50 External Bottom T A_HKT_C.chan[51] delta_time HKT MEB PCE1 2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB PCE1 2 T MEB-12 - A_HKT_C.chan[10] delta_time HKT SCIF MYFLEX T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation -Y S/C Flexure T A_HKT_C.chan[93] delta_time PDUB THERM CT T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU CT BOARD B T -MEB-25 A_HKT_C.chan[77] delta_time HKT OFA2 PRI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-35 OFA2 PRI T - A_HKT_C.chan[20] delta_time SPDB THERM T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation REDUNDANT SPD THERMISTOR MEB-35 A_HKT_C.chan[81] delta_time HKT LRS ORAD1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation LRS Optics RadiatorT (Pri) TCS-08 A_HKT_C.chan[56] delta_time HKT_DEM4_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 82 - DEM4_TH_A-MEB-45 External Bottom T A_HKT_C.chan[46] delta_time HKT_DEM5_T4_ET_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 83 - DEM5_TH_A-MEB-46 External Top T A_HKT_C.chan[47] delta_time HKT MEB PCE2 2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB PCE2 2 T MEB-14 - A_HKT_C.chan[12] delta_time HKT LHP RES1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation LHP Compensation Chamber T (Pri) TCS-10 A_HKT_C.chan[52] delta_time HKT TEL SEC1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Telescope, Secondary Mirror T (Pri) TCS-01 A_HKT_C.chan[97] delta_time HKT_DEM3_T4_ET_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 78 - DEM3_TH_A-MEB-41 External Top T A_HKT_C.chan[42] delta_time HKT MEB HKT T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB HKT T MEB-21 - A_HKT_C.chan[2] delta_time HKT_DEM3_T1_EB_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 79 - DEM3_TH_B-MEB-42 External Bottom T A_HKT_C.chan[43] delta_time HKT OFA2 RED T ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-36 OFA2 RED T - A_HKT_C.chan[27] delta_time degreesC HKT MEB PCE1 1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB PCE1 1 T MEB-11 - A_HKT_C.chan[9] delta_time HKT CCHP ADIAB T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Laser CCHP Adiabatic Section T TCS-12 A_HKT_C.chan[55] delta_time HKT_OB_PZ3_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Optical Bench +z3 T TCS_31 A_HKT_C.chan[103] delta_time HKT OFA4 RED T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-40 OFA4 RED T - A_HKT_C.chan[29] delta_time HKT LRS ORAD2 T ATL01/atlas/a_hkt_c_1061 converted referenceInformation LRS Optics Radiator T (Red) TCS-09 A_HKT_C.chan[57] delta_time degreesC HKT OFA1 RED T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-34 OFA1 RED T - A_HKT_C.chan[26] delta_time HKT_OFA1_ET_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation OFA1 ETALON T TCS_58 A_HKT_C.chan[104] delta_time HKT OFA4 PRI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-39 OFA4 PRI T - A_HKT_C.chan[22] delta_time HVPCTHERM T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PRIMARY HVPC THERMISTOR A MEB-30 A_HKT_C.chan[68] delta_time HKT IMSC MZFLEX T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation IMSC Flexure 2 T TCS-29 A_HKT_C.chan[89] delta_time HKT LHP RES2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation LHP Compensation Chamber T (Red) TCS-11 A_HKT_C.chan[53] delta_time HKT_DEM2_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 77 - DEM2_TH_A-MEB-40 External Bottom T A_HKT_C.chan[41] delta_time HKT SCIF PXFLEX T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation +X S/C Flexure T TCS-51 A_HKT_C.chan[87] delta_time HKT_DEM5_T1_EB_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 84 - DEM5_TH_B-MEB-47 External Bottom T A_HKT_C.chan[48] delta_time PDUTHERM CT T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU CT BOARD A T-MEB-24 A_HKT_C.chan[70] delta_time HKT OFA7 RED T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-46 OFA7 RED T - A_HKT_C.chan[32] delta_time HKT MEB ASC2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB ASC2 T MEB-02 - A_HKT_C.chan[1] delta_time HKT LTR TRANS T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Transmitter LTR T TCS_19 A_HKT_C.chan[102] delta_time PDUTHERM DLV B T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU LOW VOLTAGE 2A T -MEB-28 A_HKT_C.chan[72] delta_time HKT FOLDM T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Fold Mirror I/F I TCS-22 A_HKT_C.chan[83] delta_time PDUB THERM DLV B T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU LOW VOLTAGE 2B T -MEB-29 A_HKT_C.chan[79] delta_time HKT_DEM1_T3_IB_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 75 - DEM1_TH_C-MEB-38 Internal Bottom T A_HKT_C.chan[39] delta_time HKT LRS SS T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation LRS Sunshade I/F T TCS-13 A_HKT_C.chan[58] delta_time HKT MEB LVPC1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB LVPC1 T MEB-03 - A_HKT_C.chan[3] delta_time HKT IMSC MYFLEX T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation IMSC Flexure 1 T TCS-28 A_HKT_C.chan[88] delta_time HKT MEB SBC1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB SBC1 T MEB-17 - A_HKT_C.chan[15] delta_time HKT OFA7 PRI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-45 OFA7 PRI T - A_HKT_C.chan[25] delta_time HKT MEB MCE1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB MCE1 T MEB-07 - A_HKT_C.chan[5] delta_time HKT STRUC MZ T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Structure Z Panel T TCS_57 A_HKT_C.chan[92] delta_time HKT BSM T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT BSM I/F T TCS-20 - A_HKT_C.chan[33] delta_time HVPCB THERM T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation REDUNDANT HVPC THERMISTOR A MEB-31 A_HKT_C.chan[75] delta_time HKT OFA3 RED T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-38 OFA3 RED T - A_HKT_C.chan[28] delta_time HKT MEB PCE3 1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB PCE3 1 T MEB-15 - A_HKT_C.chan[13] delta_time HKT_DEM5_T3_IB_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 85 - DEM5_TH_C-MEB-48 Internal Bottom T A_HKT_C.chan[49] delta_time HKT TEL PRI2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Telescope, Primary Mirror T (Red) TCS-06 A_HKT_C.chan[96] delta_time HKT TEL TOW1 T ATL01/atlas/a_hkt_c_1061 converted referenceInformation Telescope, Tower T (Pri) TCS-03 A_HKT_C.chan[99] delta_time degreesC HKT OFA1 PRI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-33 OFA1 PRI T - A_HKT_C.chan[19] delta_time HVPCB THERM B T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation REDUNDANT HVPC THERMISTOR B MEB-33 A_HKT_C.chan[76] delta_time HKT_DEM1_T1_EB_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 74 - DEM1_TH_B-MEB-37 External Bottom t A_HKT_C.chan[38] delta_time PDUTHERM MI T ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU MAIN PWR BOARD A T-MEB_22 A_HKT_C.chan[73] delta_time degreesC HKT LTR TAMS T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation TAMS LTR T TCS-18 A_HKT_C.chan[94] delta_time HKT MEB PCE2 1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB PCE2 1 T MEB-13 - A_HKT_C.chan[11] delta_time PDUTHERM DLV T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU LOW VOLTAGE 1A T-MEB-26 A_HKT_C.chan[71] delta_time HKT OFA3 PRI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-37 OFA3 PRI T - A_HKT_C.chan[21] delta_time HKT MEB SBC2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB SBC2 T MEB-18 - A_HKT_C.chan[16] delta_time HKT CCHP LAS1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Laser 1 I/F T TCS-14 A_HKT_C.chan[59] delta_time HVPCTHERM B T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PRIMARY HVPC THERMISTOR B MEB-32 A_HKT_C.chan[69] delta_time HKT SCIF PYFLEX T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation -+Y S/C Flexure T TCS-53 A_HKT_C.chan[101] delta_time HKT OB MZ3 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Optical Bench, -Z Side T TCS-25 A_HKT_C.chan[67] delta_time HKT_BEAMX_PX_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation A_HKT_BEAMX_PX_T A_HKT_C.chan[62] delta_time HKT MEB MCE3 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB MCE3 T MEB-09 - A_HKT_C.chan[7] delta_time SPDTHERM T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PRIMARY SPD THERMISTOR MEB-34 A_HKT_C.chan[74] delta_time HKT MEB MCE4 T ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB MCE4 T MEB-10 - A_HKT_C.chan[8] delta_time degreesC PDUB THERM DLV T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU LOW VOLTAGE 1B T -MEB-27 A_HKT_C.chan[78] delta_time HKT_DEM1_T4_ET_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 73 - DEM1_TH_A-MEB-36 External Top T A_HKT_C.chan[37] delta_time HKT TEL PRI3 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT Telescope, Primary Mirror T TCS-07 - A_HKT_C.chan[35] delta_time HKT DOM RAD1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT DAA DOM Radiator T (Pri) TCS-47 - A_HKT_C.chan[36] delta_time HKT BEAMX T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Beam Expander I/F mTTCS-21 or 30 A_HKT_C.chan[82] delta_time HKT LHP VAPLINE T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation A_HKT_LHP_VAPLINE_T TCS-17 A_HKT_C.chan[90] delta_time HKT_DEM3_T3_IB_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 80 - DEM3_TH_C-MEB-43 Internal Bottom T A_HKT_C.chan[44] delta_time HKT OFA6 RED T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-44 OFA6 RED T - A_HKT_C.chan[31] delta_time HKT LASRAD T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Laser LHP Radiator T TCS_54 A_HKT_C.chan[61] delta_time HKT SPD T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation SPD I/F T TCS-50 A_HKT_C.chan[85] delta_time HKT TEL SEC2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Telescope, Secondary Mirror T (Red) TCS-02 A_HKT_C.chan[98] delta_time HKT OB MZ1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Optical Bench, -Z Side T TCS-23 A_HKT_C.chan[65] delta_time HKT_OFA7_ET_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation OFA7 ETALON T TCS_59 A_HKT_C.chan[106] delta_time HKT TEL TOW2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Telescope, Tower T (Red) TCS-04 A_HKT_C.chan[100] delta_time HKT LHP LIQLINE T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation LHP Liquid Line T TCS-16 A_HKT_C.chan[60] delta_time HKT MEB LVPC2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB LVPC2 T MEB-04 - A_HKT_C.chan[4] delta_time HKT_SUNSHADE_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Structure +Z Panel T A_HKT_C.chan[86] delta_time HKT MEB ASC1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB ASC1 T MEB-01F - A_HKT_C.chan[0] delta_time HKT WTEM T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation OFA WTEM I/F T TCS-49 A_HKT_C.chan[84] delta_time HKT_DEM5_T2_IT_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 86 - DEM5_TH_D-MEB-49 Internal Top T A_HKT_C.chan[50] delta_time HKT MEB USO2 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB USO2 T MEB-20 - A_HKT_C.chan[18] delta_time HKT_DEM3_T2_IT_T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT A/D Ch 81 - DEM3_TH_D-MEB-44 Internal Top T A_HKT_C.chan[45] delta_time HKT OB PZ1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation Optical Bench, +Z Side T TCS-26 A_HKT_C.chan[63] delta_time HKT MEB USO1 T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT MEB USO1 T MEB-19 - A_HKT_C.chan[17] delta_time PDUB THERM MI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation PDU MAIN PWR BOARD B T -MEB_23 A_HKT_C.chan[80] delta_time HKT OFA5 PRI T degreesC ATL01/atlas/a_hkt_c_1061 converted referenceInformation HKT TCS-41 OFA5 PRI T - A_HKT_C.chan[23] delta_time delta_time Thermal data from APID 1061 Analog HK Telemetry. Packet Frequency is 1 in Hertz. Data within this group are stored at the data rate of the source APID. (Nominally 1HZ). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. The timestamp is computed based on the housekeeping design to sample laser near the asc 1pps internal pulse. (See the L1B ATBD section 5 Radiometric Corrections ) Spot laser energy for PCE3, weak joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE3 weak spot, derived from the internal laser energy monitor and split by calibration. delta_time Laser Mode Setting 1 ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser Mode setting reported in A_SLA_HK (APID 1032). delta_time Spot laser energy for PCE3, strong joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE3 strong spot, derived from the internal laser energy monitor and split by calibration. delta_time total laser energy joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Total laser energy derived from the internal laser energy monitor (APID 1032). delta_time Laser Temperature degreesC ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser Temperature. From SLA_HK Telemetry packet (APID 1032, Laser Cmd Code 0xFE LAS-14, raw_lem_temp). delta_time Spot laser energy for PCE1, strong joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE1 strong spot, derived from the internal laser energy monitor and split by calibration. delta_time Spot laser energy for PCE2, weak joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE2 weak spot, derived from the internal laser energy monitor and split by calibration. delta_time Spot laser energy for PCE2, strong joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE2 strong spot, derived from the internal laser energy monitor and split by calibration. delta_time Spot laser energy for PCE1, weak joules ICESat-2 L1B ATBD, Section 5.2, Transmitted Energy referenceInformation Laser energy for the PCE1 weak spot, derived from the internal laser energy monitor and split by calibration. delta_time delta_time Internal laser energy from APID 1032 SLA_HK. Packet Frequency is 1 Hertz. Data within this group are provided at the packet rate of 1hz. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. +5D Monitor volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation +5D Monitor - A_HKT_D.chan[7] delta_time +15V Monitor volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation +15V Monitor - A_HKT_D.chan[9] delta_time 2P5VTLM-PCE3 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 2P5VTLM-PCE3 - A_HKT_D.chan[27] delta_time 3.3V Monitor volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 3.3V Monitor - A_HKT_D.chan[6] delta_time 5P0V_SBC_TLM volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 5P0V_SBC_TLM - A_HKT_D.chan[29] delta_time HKT 1.5V Monitor volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation HKT 1.5V Monitor - A_HKT_D.chan[5] delta_time ITLM-USO amps ATL01/atlas/a_hkt_d_1062 converted referenceInformation ITLM-USO - A_HKT_D.chan[15] delta_time 2P5VTLM-PCE2 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 2P5VTLM-PCE2 - A_HKT_D.chan[26] delta_time 1P5VTLM-ASC volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 1P5VTLM-ASC - A_HKT_D.chan[22] delta_time 1P5VBTLM-PCE3 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 1P5VBTLM-PCE3 - A_HKT_D.chan[18] delta_time 3P3ITLM-LVPC amps ATL01/atlas/a_hkt_d_1062 converted referenceInformation 3P3ITLM-LVPC - A_HKT_D.chan[12] delta_time 1P5VATLM-PCE1 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 1P5VATLM-PCE1 - A_HKT_D.chan[23] delta_time 5P0I_SBC_TLM amps ATL01/atlas/a_hkt_d_1062 converted referenceInformation 5P0I_SBC_TLM - A_HKT_D.chan[28] delta_time 15P0I_NEG_TLM-LVPC amps ATL01/atlas/a_hkt_d_1062 converted referenceInformation 15P0I_NEG_TLM-LVPC - A_HKT_D.chan[21] delta_time HKT -5A Monitor volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation HKT -5A Monitor - A_HKT_D.chan[11] delta_time CAL +65.3 degreesC ATL01/atlas/a_hkt_d_1062 converted referenceInformation CAL +65.3 - A_HKT_D.chan[0] delta_time 1P5VATLM-PCE2 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 1P5VATLM-PCE2 - A_HKT_D.chan[16] delta_time CAL -35.9 degreesC ATL01/atlas/a_hkt_d_1062 converted referenceInformation CAL -35.9 - A_HKT_D.chan[3] delta_time CAL +25 degreesC ATL01/atlas/a_hkt_d_1062 converted referenceInformation CAL +25 - A_HKT_D.chan[1] delta_time 2P5VTLM-PCE1 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 2P5VTLM-PCE1 - A_HKT_D.chan[19] delta_time -15V Monitor volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation -15V Monitor - A_HKT_D.chan[10] delta_time 1P5VATLM-PCE3 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 1P5VATLM-PCE3 - A_HKT_D.chan[17] delta_time 15P0I_POS_TLM-LVPC amps ATL01/atlas/a_hkt_d_1062 converted referenceInformation 15P0I_POS_TLM-LVPC - A_HKT_D.chan[20] delta_time Ground check counts ATL01/atlas/a_hkt_d_1062 converted referenceInformation Ground check - A_HKT_D.chan[30] delta_time VTLM-USO volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation VTLM-USO - A_HKT_D.chan[14] delta_time CAL -62.5 degreesC ATL01/atlas/a_hkt_d_1062 converted referenceInformation CAL -62.5 - A_HKT_D.chan[4] delta_time 5P0ITLM-LVPC amps ATL01/atlas/a_hkt_d_1062 converted referenceInformation 5P0ITLM-LVPC - A_HKT_D.chan[13] delta_time HKT +5A Monitor volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation HKT +5A Monitor - A_HKT_D.chan[8] delta_time CAL -6.6 degreesC ATL01/atlas/a_hkt_d_1062 converted referenceInformation CAL -6.6 - A_HKT_D.chan[2] delta_time 1P5VBTLM-PCE2 ATL01/atlas/a_hkt_d_1062 converted referenceInformation 1P5VBTLM-PCE2 - A_HKT_D.chan[25] delta_time volts 1P5VBTLM-PCE1 volts ATL01/atlas/a_hkt_d_1062 converted referenceInformation 1P5VBTLM-PCE1 - A_HKT_D.chan[24] delta_time delta_time Data from APID 1062 Analog HK Telemetry. Packet Frequency is 1 in Hertz. Voltage and current data Data within this group are stored at the data rate of the source APID. (Nominally 1HZ). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP GPS Epoch. This is computed based on the housekeeping design to sample a measurement every 0.003125 seconds from the internal ASC 1PPS . The time for this packet is set as the time of the lowest software channel number in this telemetry packet. If the specific time is needed add to it the difference of its actual ATLAS hardware channel number from the lowest software channel number times the 0.003125 seconds. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. PDU P3P3V DEM5 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM5 I - A_HKT.chan[57] delta_time PDU N3V DEM1 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM1 I - A_HKT.chan[52] delta_time PDU TCS OFA HTR1 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TCS OFA HTR1 I - A_HKT.chan[32] delta_time PDU LHP2 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LHP2 I - A_HKT.chan[44] delta_time PDU MEB LVPC V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU MEB LVPC V - A_HKT.chan[16] delta_time PDU TCS OFA HTR6 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TCS OFA HTR6 I - A_HKT.chan[37] delta_time PDU PWM TLSP PRI I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU PWM TLSP PRI I - A_HKT.chan[39] delta_time HVPC Module 3 counts ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC Module 3 - A_HKT.chan[72] delta_time HVPC TLM 7 ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC TLM 7 - A_HKT.chan[77] delta_time volts PDU P5V DEM2 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM2 V - A_HKT.chan[3] delta_time PDU LASER 1 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LASER 1 V - A_HKT.chan[14] delta_time PDU SPARE 4 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPARE 4 V - A_HKT.chan[30] delta_time PDU TCS OFA HTR4 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TCS OFA HTR4 I - A_HKT.chan[35] delta_time PDU LASER 2 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LASER 2 I - A_HKT.chan[22] delta_time PDU N3V DEM2 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM2 I - A_HKT.chan[63] delta_time PDU DET I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU DET I - A_HKT.chan[23] delta_time HVPC Module 2 counts ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC Module 2 - A_HKT.chan[71] delta_time PDU P3P3V DEM5 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM5 V - A_HKT.chan[10] delta_time PDU OFA P12V I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU OFA P12V I - A_HKT.chan[59] delta_time A PDU SPARE 5V counts ATL01/atlas/a_hkt_a_1059 converted referenceInformation A_PDU_SPARE_5_V - HKT.chan[60] delta_time PDU P5V DEM6 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM6 I - A_HKT.chan[67] delta_time PDU N3V DEM3 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM3 I - A_HKT.chan[55] delta_time PDU P5V DEM5 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM5 I - A_HKT.chan[56] delta_time PDU SPARE 2 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPARE 2 V - A_HKT.chan[28] delta_time PDU OFA P12V V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU OFA P12V V - A_HKT.chan[12] delta_time PDU P3P3V DEM2 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM2 I - A_HKT.chan[62] delta_time PDU SPD P3P3V V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPD P3P3V V - A_HKT.chan[20] delta_time PDU LRS OPTS HEATER I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LRS OPTS HEATER I - A_HKT.chan[45] delta_time PDU N3V DEM4 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM4 I - A_HKT.chan[66] delta_time HVPC Module 6 counts ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC Module 6 - A_HKT.chan[75] delta_time PDU LRS I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LRS I - A_HKT.chan[25] delta_time PDU N3V DEM3 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM3 V - A_HKT.chan[8] delta_time PDU P3P3V DEM4 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM4 I - A_HKT.chan[65] delta_time PDU P5V DEM2 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM2 I - A_HKT.chan[61] delta_time PDU P5V DEM5 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM5 V - A_HKT.chan[9] delta_time PDU MEB LVPC I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU MEB LVPC I - A_HKT.chan[26] delta_time PDU N3V DEM2 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM2 V - A_HKT.chan[5] delta_time PDU P3P3V DEM2 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM2 V - A_HKT.chan[4] delta_time PDU TCS OFA HTR5 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TCS OFA HTR5 I - A_HKT.chan[36] delta_time PDU TCS OFA HTR7 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TCS OFA HTR7 I - A_HKT.chan[38] delta_time PDU LHP1 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LHP1 I - A_HKT.chan[43] delta_time PDU N3V DEM1 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM1 V - A_HKT.chan[2] delta_time PDU P5V DEM1 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM1 I - A_HKT.chan[50] delta_time PDU P5V DEM3 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM3 I - A_HKT.chan[53] delta_time PDU SPD N5V V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPD N5V V - A_HKT.chan[19] delta_time PDU PWM TLSP TOWER I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU PWM TLSP TOWER I - A_HKT.chan[41] delta_time PDU LASER 2 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LASER 2 V - A_HKT.chan[15] delta_time PDU P3P3V DEM1 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM1 V - A_HKT.chan[1] delta_time PDU DET V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU DET V - A_HKT.chan[17] delta_time PDU SPD P5V I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPD P5V I - A_HKT.chan[47] delta_time PDU P3P3V DEM3 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM3 V - A_HKT.chan[7] delta_time PDU N3V DEM5 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM5 I - A_HKT.chan[58] delta_time PDU DAA OPTS HTR I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU DAA OPTS HTR I - A_HKT.chan[46] delta_time HVPC Module 4 counts ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC Module 4 - A_HKT.chan[73] delta_time PDU SPD P5V V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPD P5V V - A_HKT.chan[18] delta_time PDU SPARE 3 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPARE 3 V - A_HKT.chan[29] delta_time PDU LHP STARTUP HTR I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LHP STARTUP HTR I - A_HKT.chan[42] delta_time PDU SPD N5V I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPD N5V I - A_HKT.chan[48] delta_time PDU P5V DEM1 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM1 V - A_HKT.chan[0] delta_time PDU TCS OFA HTR2 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TCS OFA HTR2 I - A_HKT.chan[33] delta_time PDU SPD P3P3V I ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPD P3P3V I - A_HKT.chan[49] delta_time amps HVPC Module 1 counts ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC Module 1 - A_HKT.chan[70] delta_time PDU TCS OFA HTR3 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TCS OFA HTR3 I - A_HKT.chan[34] delta_time PDU SPARE 1 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU SPARE 1 V - A_HKT.chan[27] delta_time PDU LASER 1 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU LASER 1 I - A_HKT.chan[21] delta_time PDU P5V DEM3 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM3 V - A_HKT.chan[6] delta_time PDU PWM TLSP SEC I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU PWM TLSP SEC I - A_HKT.chan[40] delta_time PDU N3V DEM6 I ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM6 I - A_HKT.chan[69] delta_time amps PDU HVPC I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU HVPC I - A_HKT.chan[24] delta_time HVPC Module 5 counts ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC Module 5 - A_HKT.chan[74] delta_time PDU P3P3V DEM1 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM1 I - A_HKT.chan[51] delta_time PDU P3P3V DEM6 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM6 I - A_HKT.chan[68] delta_time HVPC TLM 6 volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation HVPC TLM 6 - A_HKT.chan[76] delta_time PDU P5V DEM4 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P5V DEM4 I - A_HKT.chan[64] delta_time PDU P3P3V DEM3 I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU P3P3V DEM3 I - A_HKT.chan[54] delta_time PDU OFA N12V V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU OFA N12V V - A_HKT.chan[13] delta_time PDU N3V DEM5 V volts ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU N3V DEM5 V - A_HKT.chan[11] delta_time PDU TAMS I amps ATL01/atlas/a_hkt_a_1059 converted referenceInformation PDU TAMS I - A_HKT.chan[31] delta_time delta_time PDU Analog HK Telemetry. The PDU analog telemetry digitized by the HKT card and collected by the SBC Thermal Control Task. Packet Frequency is 1 in Hertz. Data is from the APID 1059 (Primary) or APID 1060 (Redundant) HK packets. Data within this group are stored at the data rate of the source APID. (Nominally 1HZ). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. z_sc_eci_pos meters ATL01/atlas/a_sc_pos_1137 referenceInformation Spacecraft Earth-Centered-Inertial Position: Z axis delta_time z_sc_eci_vel ATL01/atlas/a_sc_pos_1137 referenceInformation Spacecraft Earth-Centered-Inertial Velocity: Z axis delta_time meters/second sc_solution_sec seconds ATL01/atlas/a_sc_pos_1137 referenceInformation Recorded time of the position/velocity solution in seconds from the spacecraft epoch delta_time sc_solution_subsec seconds ATL01/atlas/a_sc_pos_1137 referenceInformation Spacecraft recorded time counts - 24 bits, 100 ns per count delta_time x_sc_eci_vel ATL01/atlas/a_sc_pos_1137 referenceInformation Spacecraft Earth-Centered-Inertial Velocity: X axis delta_time meters/second y_sc_eci_vel meters/second ATL01/atlas/a_sc_pos_1137 referenceInformation Spacecraft Earth-Centered-Inertial Velocity: Y axis delta_time y_sc_eci_pos meters ATL01/atlas/a_sc_pos_1137 referenceInformation Spacecraft Earth-Centered-Inertial Position: Y axis delta_time x_sc_eci_pos meters ATL01/atlas/a_sc_pos_1137 referenceInformation Spacecraft Earth-Centered-Inertial Position: X axis delta_time delta_time APID 1137 ATLAS Position Message-Spacecraft Position and Velocity Packet - Relayed to SSR. Packet Frequency is in Hertz. Data within this group are stored at the data rate of the source APIDs. (only downlinked on command). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. PDUB_OFA1 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA1 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_LHP_STARTUP status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_LHP_STARTUP status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_DET_PS status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_DET_PS status flag. 0=ON, 1=OFF delta_time on off 0 1 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_SPARE_SIG status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_SPARE_SIG status flag PDUB_OFA7 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA7 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_LRS_OPT status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_LRS_OPT status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_LASER_2 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_LASER_2 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_OFA_PS status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA_PS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_OFA5 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA5 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_SPD_PS status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_SPD_PS status flag. 0=ON, 1=OFF delta_time on off 0 1 counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_LHP_STARTUP status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_LHP_STARTUP status flag PDUA_PRI_MIR status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_PRI_MIR status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_HVPC status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_HVPC status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_TAMS_LS status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_TAMS_LS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_DAA_OPT status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_DAA_OPT status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_OFA4 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA4 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_SEC_MIR status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_SEC_MIR status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_LRS status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_LRS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_LHP2 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_LHP2 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_DET_PS status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_DET_PS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_SPARE_SIG status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_SPARE_SIG status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA5 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA5 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_HVPC status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_HVPC status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_SPD_PS status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_SPD_PS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_LASER_2 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_LASER_2 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_OFA6 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA6 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_TOWER status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_TOWER status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA4 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA4 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA2 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA2 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA_PS status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA_PS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA1 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA1 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_LRS_OPT status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_LRS_OPT status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_LRS status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_LRS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA6 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA6 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_LASER_1 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_LASER_1 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_SEC_MIR status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_SEC_MIR status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_OFA2 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA2 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_TOWER status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_TOWER status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA7 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA7 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_DAA_OPT status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_DAA_OPT status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_TAMS_LS status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_TAMS_LS status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_LHP2 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_LHP2 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_OFA3 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_OFA3 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_OFA3 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_OFA3 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_LASER_1 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_LASER_1 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUA_LHP1 status flag counts ATL01/atlas/a_hkt_status_1065 converted referenceInformation PDUA_LHP1 status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_PRI_MIR status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_PRI_MIR status flag. 0=ON, 1=OFF delta_time on off 0 1 PDUB_LHP1 status flag 1 ATL01/atlas/a_hkt_status_1065 converted 0 1 referenceInformation PDUB_LHP1 status flag. 0=ON, 1=OFF delta_time on off 0 1 delta_time Flags parsed from HKT Status Registers Housekeeping Packet. Packet Frequency is 1 in Hertz. Data within this group are stored at the data rate of the source APID. (Nominally 1HZ). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. gps 1pps seconds since January 6, 1980 ATL01/APID 1136 Byte 0014-0017 referenceInformation GPS reported seconds. delta_time gps 1pps subsec milliseconds ATL01/APID 1136 Byte 0014-0017 referenceInformation GPS reported subseconds delta_time SC time at 1 pps seconds since January 6, 1980 ATL01/APID 1136 Byte 0014-0017 referenceInformation SC time at the reception of the last 1PPS signal from the GPSR. delta_time SC time at 1 pps (subsec) 100 nanoseconds ATL01/APID 1136 Byte 0014-0017 referenceInformation Subsecond portion of the SC time at the reception of the last 1PPS signal from the GPSR (seconds since SC epoch: 6-Jan-1980 00:00:00) delta_time delta_time APID 1136 Spacecraft Time at the Tone Packet - Relayed to SSR. Packet Frequency is by command. ATLAS Time-At-The-Tone-Was Message Data within this group are stored at the data rate of the source APIDs. (only downlinked on command). Elapsed GPS seconds time seconds since 2018-01-01 Operations referenceInformation Elapsed seconds since the ATLAS SDP GPS Epoch, associated with the transmit time where data from all 3 PCEs are present and aligned. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. seconds 3.402823466e+38 Transmit Pulse Skew Estimate ATL02 ATBD, Section 7.2 modelResult The difference between the averages of the lower and upper threshold crossing times. This is an estimate of the transmit pulse skew. delta_time 3.402823466e+38 Transmit Pulse Energy Lower Width seconds ATL03 ATBD modelResult The distance between the lower threshold crossing times measured by the Start Pulse Detector. Only present when data from all 3 PCEs are available and aligned. delta_time 3.402823466e+38 Transmit Pulse Energy Upper Width seconds ATL03 ATBD modelResult The distance between the upper threshold crossing times measured by the Start Pulse Detector. Only present when data from all 3 PCEs are available and aligned. delta_time delta_time Contains parameters to characterize the ATLAS pulse shape, derived from the Start Pulse Detector data. Parameters in this group are stored at the ATLAS shot rate. Group contains the Photon Counting Electronics x (PCEx) packet decommutated data Data within this group are stored at the data rate of the source PCE Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for 50 bytes 1 ATL01/atlas/pcex/a_sxp_ssr 1 50 referenceInformation Dimension scale for an array of 50 samples. delta_time latitude longitude latitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Latitude delta_time longitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Longitude delta_time First Major Frame cosZ counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the solar zenith angle delta_time latitude longitude PCE Major frame counter counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time latitude longitude cosB counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the off-nadir angle as calculated onboard from the spacecraft information delta_time latitude longitude srm 1 ATL01/atlas/pcex/a_sxp_ssr referenceInformation Surface type, vegetation and coastline information from the SRM. (bit 0-1 = surface type (0=ocean, 1=land, 2=sea ice, 3=land ice). Bit 2 = vegetation present, Bit 3 = coastline present) delta_time latitude longitude delta_time ds_50samples SBC Extrapolation Task telemetry containing Flight Science Receiver Algorithm team requested telemetry for the first set of PCE extrapolation data for a major frame.: lat, long, range, nadir angle, etc. (from APIDs 1152 thru 1157) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. last sequence packet count counts APID 1072, 1088, 1104 Byte 0060-0061 referenceInformation CCSDS Packet Sequence Count value of the last downlink packet prior to the major frame. This should be the last packet associated with the previous major frame. That packet should contain the last Tx/RX data for the last shot of the previous major frame. (not EU-converted) delta_time Altimetric Weak Range Window Start Reg counts APID 1072, 1088, 1104 Byte 0086-0088 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the altimetric range window for the weak spot. (not EU-converted) delta_time T0 counter counts APID 1072, 1088, 1104 Byte 0028-0029 referenceInformation ATLAS flight s/w T0 counter that clears with 1PPS (not EU-converted) delta_time SpW Not Ready Counter counts APID 1072, 1088, 1104 Byte 0115 referenceInformation Counts each time SpW causes DFC to wait to transmit data to back-end (Status Only) (not EU-converted) delta_time Science Data Segment Limit Size counts APID 1072, 1088, 1104 Byte 0069-0070 referenceInformation Science Data Segment Limit Size ; initialization Value (not EU-converted) delta_time Altimetric Strong Range Window Start Reg counts APID 1072, 1088, 1104 Byte 0076-0078 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the altimetric range window for the strong spot (not EU-converted) delta_time strong spot tag counter counts APID 1072, 1088, 1104 Byte 0034-0041 referenceInformation The number of events received by the DFC on channels 1 through 16 summed over 50 range window openings. The four elements of the array correspond to dividing the major frame up into 50 shots. The last element of the array can be 49 or 51 shots depending on the alignment of the range windows with respect to the major frame. Note that these counts are time tag counts and are subject to all the limitations and behaviors associated with time tags (duplicates, FIFO overflows, etc.). (not EU-converted) delta_time Altimetric Strong Range Window Width Reg counts APID 1072, 1088, 1104 Byte 0079-0080 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the range window start and range window stop for the strong spot. (not EU-converted) delta_time weak spot tag counter counts APID 1072, 1088, 1104 Byte 0042-48 referenceInformation The number of events received by the DFC on channels 17 through 20 summed over 50 range window openings. The four elements of the array correspond to dividing the major frame up into 50 shots. The last element of the array can be 49 or 51 shots depending on the alignment of the range windows with respect to the major frame. Note that these counts are time tag counts and are subject to all the limitations and behaviors associated with time tags (duplicates, FIFO overflows, etc.). (not EU-converted) delta_time Command Counter counts APID 1072, 1088, 1104 Byte 0062-0063 referenceInformation Command Counter; Indicates the number of good commands received by the DFC prior to the Major Frame Packet being transmitted (not EU-converted) delta_time General Purpose Register counts APID 1072, 1088, 1104 Byte 0100-0101 referenceInformation General Purpose Register (not EU-converted) delta_time tx latest leading edge coarse counts APID 1072, 1088, 1104 Byte 0054-0056 referenceInformation Latest Leading Start Time Tag-acquired leading start time tag value (paired with trailing start time time tag value) coarse time in counts (not EU-converted) delta_time APID 1072, 1088, 1104 Byte 0106-0110 referenceInformation DFC Housekeeping Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time DFC Housekeeping Status Bits counts Tag write watchdog value counts APID 1072, 1088, 1104 Byte 0072-0073 referenceInformation Tag write watchdog value ; initialization Value (not EU-converted) delta_time Atmospheric Strong Range Window Start Reg clock cycles APID 1072, 1088, 1104 Byte 0081-0083 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the Atmospheric range window for the strong spot. (not EU-converted) delta_time Duplicate time tag removal counts APID 1072, 1088, 1104 Byte 0066-0067 referenceInformation Duplicate time tag removal ; initialization Value (not EU-converted) delta_time tx latest trailing edge fine counts APID 1072, 1088, 1104 Byte 0057-0059 referenceInformation Latest trailing Start Time Tag-acquired trailing start time tag value (paired with trailing start time time tag value) cell counts (not EU-converted) delta_time Atmospheric Weak Range Window Width Reg clock cycles APID 1072, 1088, 1104 Byte 0094-0095 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the Atmospheric range window start and range window stop for the weak spot. (not EU-converted) delta_time Major frame frequency counts APID 1072, 1088, 1104 Byte 0074 referenceInformation The number of shots per major frame. (not EU-converted) delta_time Debug Status Bits counts APID 1072, 1088, 1104 Byte 0112-0114 referenceInformation Debug Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12. (not EU-converted) delta_time Configuration counts APID 1072, 1088, 1104 Byte 0075 referenceInformation Configuration bits (not EU-converted) delta_time tx latest trailing edge coarse counts APID 1072, 1088, 1104 Byte 0057-0059 referenceInformation Latest trailing Start Time Tag-acquired trailing start time tag value (paired with trailing start time time tag value) coarse time in counts (not EU-converted) delta_time Logical address for science data transmit counts APID 1072, 1088, 1104 Byte 0065 referenceInformation Logical address for science data transmit ; initialization Value (not EU-converted) delta_time Tag wait watchdog value counts APID 1072, 1088, 1104 Byte 0071 referenceInformation Tag wait watchdog value ; initialization Value (not EU-converted) delta_time tx latest leading edge fine counts APID 1072, 1088, 1104 Byte 0054-0056 referenceInformation Latest Leading Start Time Tag-acquired leading start time tag value (paired with trailing start time time tag value) cell counts (not EU-converted) delta_time Atmospheric Weak Range Window Start Reg clock cycles APID 1072, 1088, 1104 Byte 0091-0093 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the Atmospheric range window for the weak spot. (not EU-converted) delta_time Atmospheric Strong Range Window Width Reg clock cycles APID 1072, 1088, 1104 Byte 0084-0085 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the Atmospheric range window start and range window stop for the strong spot. (not EU-converted) delta_time IMET at 1 pps counts APID 1072, 1088, 1104 Byte 0016-0021 referenceInformation ATLAS flight s/w 25 MHz IMET counter value when 1PPS is received (not EU-converted) delta_time Debug Control Register counts APID 1072, 1088, 1104 Byte 0096-0099 referenceInformation Debug Control Register (not EU-converted) delta_time Calibration request interval from TDC counts APID 1072, 1088, 1104 Byte 0068 referenceInformation Calibration request interval from TDC (not EU-converted) delta_time EDAC Status Bits counts APID 1072, 1088, 1104 Byte 102-105 referenceInformation EDAC Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time counts Altimetric Latest Calibration Rising APID 1072, 1088, 1104 Byte 0050-0051 referenceInformation The PCE latest calibration value for the rising edge (not EU-converted) delta_time PCE Major frame counter counts APID 1072, 1088, 1104 Byte 0030-0033 referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time IMET at first T0 after 1 pps counts APID 1072, 1088, 1104 Byte 0022-0027 referenceInformation ATLAS flight s/w 25 MHz IMET counter value when 1PPS is received (not EU-converted) delta_time Last Opcode Received counts APID 1072, 1088, 1104 Byte 0064 referenceInformation Indicates the last good opcode received prior to the Major Frame Packet being transmitted; 0xFF indicates an error condition of either protocol ID mismatch, invalid opcode, or invalid length (not EU-converted) delta_time Altimetric Weak Range Window Width Reg counts APID 1072, 1088, 1104 Byte 0089-0090 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the range window start and range window stop for the weak spot. (not EU-converted) delta_time MET 1pps counter counts APID 1072, 1088, 1104 Byte 0012-0015 referenceInformation ATLAS flight s/w 1PPS counter (not EU-converted) delta_time DFC Status Bits counts APID 1072, 1088, 1104 Byte 0111 referenceInformation DFC Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time Altimetric Latest Calibration Falling counts APID 1072, 1088, 1104 Byte 0052-0053 referenceInformation The PCE latest calibration value for the falling edge. (not EU-converted) delta_time delta_time This DFCx_hk is a diagnostic packet (APID 1072, 1088, 1104) that contains some of the parameters normally part of APID 1254, 1264, 1274 (as sequence flag 01). Also know as the PCE Altimetric Science Data Major Frame described in ICESat-2-MEB-SPEC-0875, section 5.13 Table 19. The data in the group are neither calibrated nor EU-converted, but preserved from ATL01 in order provided diagnostics for TOF processing. Data within this group are stored at the data rate of the source APID (nominally 50 Hz). DS for 2 bytes 1 Dimension Scale 1 2 referenceInformation Dimension scale for an array of 2 samples. DS for 4 bytes 1 Dimension Scale 1 4 referenceInformation Dimension scale for an array of 4 bytes. Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. GPS seconds at the Major Frame seconds ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation GPS seconds at the Major Frame delta_time Band Mask counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Band Mask. Each byte corresponds to a single Band, in the order of 1-4. delta_time AMET seconds at the Major Frame seconds ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation AMET seconds at the Major Frame delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Band Channel Mask counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Band Channel Mask. (Bands 1-4) delta_time PCE Major frame counter counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time Number of bands counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Number of bands. delta_time delta_time ds_4bytes ds_2samples The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation FSW error flags ../delta_time Error Flags counts Day/Night flag counts ATL01/atlas/pcex/a_pmf_algorithm_science 0 1 referenceInformation ATLAS flight software Day/Night Flag associated with the major frame. 0= day, 1 =night. Based on an algorithm determination of the background rate, not on the actual position of the sun. ../delta_time day night 0 1 Decision Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w Decision Flags associated with the major frame. indication if there was an error or if no science data is sent and why ../delta_time Flywheel counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Flywheel associated with the major frame. ../delta_time Signal Found Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w signal event flags associated with the major frame. ../delta_time The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation FSW error flags ../delta_time Error Flags counts Day/Night flag counts ATL01/atlas/pcex/a_pmf_algorithm_science 0 1 referenceInformation ATLAS flight software Day/Night Flag associated with the major frame. 0= day, 1 =night. Based on an algorithm determination of the background rate, not on the actual position of the sun. ../delta_time day night 0 1 Decision Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w Decision Flags associated with the major frame. indication if there was an error or if no science data is sent and why ../delta_time Flywheel counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Flywheel associated with the major frame. ../delta_time Signal Found Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w signal event flags associated with the major frame. ../delta_time The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Histogram Dimension Scale seconds ATL02 referenceInformation Relative bin values of windowed, peak-centered TOF histograms. Peak value = 0 Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for Strong Channels 1 Dimension Scale 1 16 referenceInformation Dimension scale for strong channels. DS for Weak Channels 1 Dimension Scale 1 4 referenceInformation Dimension scale for weak channels. Channel Mask Strong counts ATL01/atlas/pcex/a_alt_science referenceInformation Channel Mask for DLBOs. The 16 flags are a logical OR of the two band offset masks for strong beam delta_time Altimetric Latest Calibration Rising seconds/cell Derived via L1B ATBD referenceInformation The smoothed, calibrated value for the rising edge used to convert cell counts to units of time. time per cell count based on USO for each PCE. delta_time Altimetric Latest Calibration Falling seconds/cell Derived via L1B ATBD referenceInformation The smoothed, calibrated value for the falling edge used to convert cell counts to units of time. time per cell count based on USO for each PCE. delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PCE Major frame counter counts ATL02 referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Number Downlink Bands counts ATL01/atlas/pcex/a_alt_science referenceInformation Number of bands (in addition to the nominal 1 band) selected for downlink. delta_time Channel Mask Weak counts ATL01/atlas/pcex/a_alt_science referenceInformation Channel Mask for DLBOs. The 4 flags are a logical OR of the two band offset masks for weak beam delta_time delta_time ds_weak_channel_index ds_strong_channel_index ds_hist The PCE Altimetry Science Packet data common to both beams (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Band2 Width seconds L1A ATBD physicalMeasurement Width of downlink band2. ../delta_time Band1 Offset L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band1. ../delta_time seconds Band1 Width L1A ATBD physicalMeasurement Width of downlink band1. ../delta_time seconds Altimetric Range Window Width seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds from the range window start and range window stop ../delta_time Center-aligned TOF Histogram counts ATL02 qualityInformation Per-major frame, peak-aligned, windowed time-of-flight histograms. ../ds_hist ../delta_time Altimetric Range Window Start seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds between the transmit pulse and the start of the altimetric range window for the beam ../delta_time Band2 Offset seconds L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band2. ../delta_time Number of photons counts Derived auxiliaryInformation Number of photons within each major frame. ../delta_time Photon Index Begin counts Derived auxiliaryInformation Index (1-based) within the photon-rate data of the first photon within each major frame. ../delta_time The PCE Altimetry Science Packet specific to a beam (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The Time of Day for the specific Transmit (TX) pulse associated with the Received (RX) event. (see L1B ATBD section 5 time of flight), relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. photon event counter counts Derived as part of Photon ID referenceInformation photon event counter is part of photon ID and will count from 1 for each channel until reset by laser pulse counter. If ph_id_count is 0, then there was a transmit pulse without any received photons. In this case, the transmit portion of the alt_science packet is valid, but the receive portion is all 0s and should not be used. delta_time Time of Flight ATL02 ATBD physicalMeasurement Time of flight (TOF); the round trip time in seconds of the received photon relative to the beam's zero range point (ZRP). Computed from the Transmit (Tx) and Receive (Rx) Time-of-flight components and then calibrated to the centroid of the transmit pulse. delta_time seconds Other Transmit Time from LL seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Time of flight from the PCE-specific leading-lower (LL) threshold (tx_ll_tof) to the detected other transmit pulse edge. For PCE1, this is the time from the PCE1 LL to the Transmit Leading Upper edge (LU) threshold; for PCE2, this is the time from the PCE2 LL to the Transmit Trailing Upper edge (TU) threshold; and for PCE3, this is the time from the PCE3 LL to the Transmit Trailing Lower edge (TL) threshold. delta_time laser pulse counter counts Derived as part of Photon ID referenceInformation laser pulse counter is part of photon ID and will count from 1 to 200 and reset for each new major frame (major_fram_id). If the corresponding ph_id_count is 0, then there was a transmit pulse without any received photons. delta_time rx downlink band id counts ATL01/atlas/pcex/a_alt_science_ph RX data 0 1 referenceInformation Flag to indicate downlink band id associated with the received rx_tof (received photon event). A value of 0 indicates the photon corresponds to band1; A value of 1 indicates the photon corresponds to band2. Corresponding parameters are band_width, band_offset and band_eventcount. delta_time band1 band2 0 1 Receive channel id 1 Derived as part of Photon ID 1 120 referenceInformation Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120). delta_time Transmit LL time from T0 seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Transmit (Tx) Leading Lower (LL) time of flight (TOF); the round trip time in seconds from the detected lower leading edge of the transmit pulse relative to the ATLAS T0. Includes all calibrations of coarse and fine counts. delta_time TOF Flag counts L1B ATBD Sect 2.5.4 1 18 referenceInformation Time Of Flight center correction flag. Values indicate what components were used to adjust the TOF to the centroid of the Tx pulse, based on the alignment of Tx components across all 3 PCEs. 1=LL_LU_TU_TL; 2=LL_TU_TL; 3=LL_LU_TL; 4=LL_LU_TU; 5=LL_TL; 6=LL_TU; 7=LL_LU; 8=LL. Values greater than 10 indicate the same sequence of conditions indicated for a potential TEP photon. delta_time LL_LU_TU_TL LL_TU_TL LL_LU_TL LL_LU_TU LL_TL LL_TU LL_LU LL TEP_LL_LU_TU_TL TEP_LL_TU_TL TEP_LL_LU_TL TEP_LL_LU_TU TEP_LL_TL TEP_LL_TU TEP_LL_LU TEP_LL 1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 PCE Major frame counter counts Retained from latest a_alt_science packet referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time delta_time Group contains the PCE Altimetric received photon event (ph) decommutated data and its matching Transmit time tag data. Note the Transmit time tag data are repeated for each received photon event. Data is from Altimetry Science Packet (alt_sci_tlm) APID 1254, 1264, 1274 with Sequence Flag = 0 or 2. See ICESat-2-MEB-SPEC-0875, section 5.12, SPACEWIRE: TIME TAG SCIENCE DATA FORMAT Data within this group are stored at the data rate of the source photon events. (varies by detection; nominal value is sixty thousand per second, derived from laser_rate * photons_per_shot * beams_per_pce; where laser_rate=10000, photons_per_shot=3, beams_per_pce=2.) Band2 Width seconds L1A ATBD physicalMeasurement Width of downlink band2. ../delta_time Band1 Offset L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band1. ../delta_time seconds Band1 Width L1A ATBD physicalMeasurement Width of downlink band1. ../delta_time seconds Altimetric Range Window Width seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds from the range window start and range window stop ../delta_time Center-aligned TOF Histogram counts ATL02 qualityInformation Per-major frame, peak-aligned, windowed time-of-flight histograms. ../ds_hist ../delta_time Altimetric Range Window Start seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds between the transmit pulse and the start of the altimetric range window for the beam ../delta_time Band2 Offset seconds L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band2. ../delta_time Number of photons counts Derived auxiliaryInformation Number of photons within each major frame. ../delta_time Photon Index Begin counts Derived auxiliaryInformation Index (1-based) within the photon-rate data of the first photon within each major frame. ../delta_time The PCE Altimetry Science Packet specific to a beam (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The Time of Day for the specific Transmit (TX) pulse associated with the Received (RX) event. (see L1B ATBD section 5 time of flight), relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. photon event counter counts Derived as part of Photon ID referenceInformation photon event counter is part of photon ID and will count from 1 for each channel until reset by laser pulse counter. If ph_id_count is 0, then there was a transmit pulse without any received photons. In this case, the transmit portion of the alt_science packet is valid, but the receive portion is all 0s and should not be used. delta_time Time of Flight ATL02 ATBD physicalMeasurement Time of flight (TOF); the round trip time in seconds of the received photon relative to the beam's zero range point (ZRP). Computed from the Transmit (Tx) and Receive (Rx) Time-of-flight components and then calibrated to the centroid of the transmit pulse. delta_time seconds Other Transmit Time from LL seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Time of flight from the PCE-specific leading-lower (LL) threshold (tx_ll_tof) to the detected other transmit pulse edge. For PCE1, this is the time from the PCE1 LL to the Transmit Leading Upper edge (LU) threshold; for PCE2, this is the time from the PCE2 LL to the Transmit Trailing Upper edge (TU) threshold; and for PCE3, this is the time from the PCE3 LL to the Transmit Trailing Lower edge (TL) threshold. delta_time laser pulse counter counts Derived as part of Photon ID referenceInformation laser pulse counter is part of photon ID and will count from 1 to 200 and reset for each new major frame (major_fram_id). If the corresponding ph_id_count is 0, then there was a transmit pulse without any received photons. delta_time rx downlink band id counts ATL01/atlas/pcex/a_alt_science_ph RX data 0 1 referenceInformation Flag to indicate downlink band id associated with the received rx_tof (received photon event). A value of 0 indicates the photon corresponds to band1; A value of 1 indicates the photon corresponds to band2. Corresponding parameters are band_width, band_offset and band_eventcount. delta_time band1 band2 0 1 Receive channel id 1 Derived as part of Photon ID 1 120 referenceInformation Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120). delta_time Transmit LL time from T0 seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Transmit (Tx) Leading Lower (LL) time of flight (TOF); the round trip time in seconds from the detected lower leading edge of the transmit pulse relative to the ATLAS T0. Includes all calibrations of coarse and fine counts. delta_time TOF Flag counts L1B ATBD Sect 2.5.4 1 18 referenceInformation Time Of Flight center correction flag. Values indicate what components were used to adjust the TOF to the centroid of the Tx pulse, based on the alignment of Tx components across all 3 PCEs. 1=LL_LU_TU_TL; 2=LL_TU_TL; 3=LL_LU_TL; 4=LL_LU_TU; 5=LL_TL; 6=LL_TU; 7=LL_LU; 8=LL. Values greater than 10 indicate the same sequence of conditions indicated for a potential TEP photon. delta_time LL_LU_TU_TL LL_TU_TL LL_LU_TL LL_LU_TU LL_TL LL_TU LL_LU LL TEP_LL_LU_TU_TL TEP_LL_TU_TL TEP_LL_LU_TL TEP_LL_LU_TU TEP_LL_TL TEP_LL_TU TEP_LL_LU TEP_LL 1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 PCE Major frame counter counts Retained from latest a_alt_science packet referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time delta_time Group contains the PCE Altimetric received photon event (ph) decommutated data and its matching Transmit time tag data. Note the Transmit time tag data are repeated for each received photon event. Data is from Altimetry Science Packet (alt_sci_tlm) APID 1254, 1264, 1274 with Sequence Flag = 0 or 2. See ICESat-2-MEB-SPEC-0875, section 5.12, SPACEWIRE: TIME TAG SCIENCE DATA FORMAT Data within this group are stored at the data rate of the source photon events. (varies by detection; nominal value is sixty thousand per second, derived from laser_rate * photons_per_shot * beams_per_pce; where laser_rate=10000, photons_per_shot=3, beams_per_pce=2.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for ATM histogram bins 1 Dimension Scale 1 467 referenceInformation Dimension scale for atmosphere histogram bins. counts Atmospheric Range Window Shift ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of bins the range window start of one of the histograms was shifted to align them before they are added together. delta_time Atmospheric Range Window Start seconds ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of seconds between the transmit pulse and the start of the Atmospheric range window delta_time Atmospheric Range Window Width seconds ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of seconds from the Atmospheric range window start and range window stop. delta_time PCE Major frame counter counts ATL01/atlas/pcex/a_atm_hist_x referenceInformation Major Frame Counter - The major frame counter is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Atmospheric Science Histogram counts ATL01/atlas/pcex/a_atm_hist_x referenceInformation The histogram bins for the Atmospheric beam.Once every 400 shots ( laser pulses). Bin 1 (clouds) is nearest to spacecraft .Bin 467 is under ground. delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 delta_time ds_hist_bin_index Contains parameters relating to the PCE Atmospheric Data Histograms. Normally 25 hz. (APID 1255, 1259, 1265, 1269, 1275, 1279). P1 S,P1 W, P2 S, P2 W, P3 S, P3 W. Data in this group is stored at a 25hz (25 per second) rate. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. AutoRestartDFCCount counts APID 1073, 1089, 1105 Byte 0090-0091 referenceInformation Number of DFC Auto Restarts delta_time cmd_err_cntr counts APID 1073, 1089, 1105 Byte 0012-0012 referenceInformation Command error counter delta_time cmd_suc_cntr counts APID 1073, 1089, 1105 Byte 0013-0013 referenceInformation Command success counter. delta_time ActiveKnobsTable counts APID 1073, 1089, 1105 Byte 0037-0037 referenceInformation The active knobs table. delta_time Mode counts APID 1073, 1089, 1105 Byte 0036-0036 0 5 referenceInformation PCE Mode. 0=STBY; 1=Science; 2=Test; 3=Manual; 4=Radio; 5=Unknown delta_time STBY Science Test Manual Radio Test 0 1 2 3 4 5 delta_time PCE Diagnostic Telemetry Packet from one of the following APIDs : 1073, 1089, 1105 (each APID is associated with a specific PCE). Packet Frequency is 1 Hertz. Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for 50 bytes 1 ATL01/atlas/pcex/a_sxp_ssr 1 50 referenceInformation Dimension scale for an array of 50 samples. delta_time latitude longitude latitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Latitude delta_time longitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Longitude delta_time First Major Frame cosZ counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the solar zenith angle delta_time latitude longitude PCE Major frame counter counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time latitude longitude cosB counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the off-nadir angle as calculated onboard from the spacecraft information delta_time latitude longitude srm 1 ATL01/atlas/pcex/a_sxp_ssr referenceInformation Surface type, vegetation and coastline information from the SRM. (bit 0-1 = surface type (0=ocean, 1=land, 2=sea ice, 3=land ice). Bit 2 = vegetation present, Bit 3 = coastline present) delta_time latitude longitude delta_time ds_50samples SBC Extrapolation Task telemetry containing Flight Science Receiver Algorithm team requested telemetry for the first set of PCE extrapolation data for a major frame.: lat, long, range, nadir angle, etc. (from APIDs 1152 thru 1157) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the 50 laser pulses used for background, in seconds relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. delta_time Weak background counts counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w indicates for the beam the # of counted time tags (BackgroundCounts_50Shot) during the range windows associated with a set of 50 laser pulses of the major frame. delta_time counts Strong background counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w indicates for the beam the # of counted time tags (BackgroundCounts_50Shot) during the range windows associated with a set of 50 laser pulses of the major frame. delta_time PCE Major frame counter counts Derived referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 delta_time The background data is specific to each beam and reported at a 50-shot rate. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Group contains the Photon Counting Electronics x (PCEx) packet decommutated data Data within this group are stored at the data rate of the source PCE Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for 50 bytes 1 ATL01/atlas/pcex/a_sxp_ssr 1 50 referenceInformation Dimension scale for an array of 50 samples. delta_time latitude longitude latitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Latitude delta_time longitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Longitude delta_time First Major Frame cosZ counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the solar zenith angle delta_time latitude longitude PCE Major frame counter counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time latitude longitude cosB counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the off-nadir angle as calculated onboard from the spacecraft information delta_time latitude longitude srm 1 ATL01/atlas/pcex/a_sxp_ssr referenceInformation Surface type, vegetation and coastline information from the SRM. (bit 0-1 = surface type (0=ocean, 1=land, 2=sea ice, 3=land ice). Bit 2 = vegetation present, Bit 3 = coastline present) delta_time latitude longitude delta_time ds_50samples SBC Extrapolation Task telemetry containing Flight Science Receiver Algorithm team requested telemetry for the first set of PCE extrapolation data for a major frame.: lat, long, range, nadir angle, etc. (from APIDs 1152 thru 1157) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. last sequence packet count counts APID 1072, 1088, 1104 Byte 0060-0061 referenceInformation CCSDS Packet Sequence Count value of the last downlink packet prior to the major frame. This should be the last packet associated with the previous major frame. That packet should contain the last Tx/RX data for the last shot of the previous major frame. (not EU-converted) delta_time Altimetric Weak Range Window Start Reg counts APID 1072, 1088, 1104 Byte 0086-0088 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the altimetric range window for the weak spot. (not EU-converted) delta_time T0 counter counts APID 1072, 1088, 1104 Byte 0028-0029 referenceInformation ATLAS flight s/w T0 counter that clears with 1PPS (not EU-converted) delta_time SpW Not Ready Counter counts APID 1072, 1088, 1104 Byte 0115 referenceInformation Counts each time SpW causes DFC to wait to transmit data to back-end (Status Only) (not EU-converted) delta_time Science Data Segment Limit Size counts APID 1072, 1088, 1104 Byte 0069-0070 referenceInformation Science Data Segment Limit Size ; initialization Value (not EU-converted) delta_time Altimetric Strong Range Window Start Reg counts APID 1072, 1088, 1104 Byte 0076-0078 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the altimetric range window for the strong spot (not EU-converted) delta_time strong spot tag counter counts APID 1072, 1088, 1104 Byte 0034-0041 referenceInformation The number of events received by the DFC on channels 1 through 16 summed over 50 range window openings. The four elements of the array correspond to dividing the major frame up into 50 shots. The last element of the array can be 49 or 51 shots depending on the alignment of the range windows with respect to the major frame. Note that these counts are time tag counts and are subject to all the limitations and behaviors associated with time tags (duplicates, FIFO overflows, etc.). (not EU-converted) delta_time Altimetric Strong Range Window Width Reg counts APID 1072, 1088, 1104 Byte 0079-0080 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the range window start and range window stop for the strong spot. (not EU-converted) delta_time weak spot tag counter counts APID 1072, 1088, 1104 Byte 0042-48 referenceInformation The number of events received by the DFC on channels 17 through 20 summed over 50 range window openings. The four elements of the array correspond to dividing the major frame up into 50 shots. The last element of the array can be 49 or 51 shots depending on the alignment of the range windows with respect to the major frame. Note that these counts are time tag counts and are subject to all the limitations and behaviors associated with time tags (duplicates, FIFO overflows, etc.). (not EU-converted) delta_time Command Counter counts APID 1072, 1088, 1104 Byte 0062-0063 referenceInformation Command Counter; Indicates the number of good commands received by the DFC prior to the Major Frame Packet being transmitted (not EU-converted) delta_time General Purpose Register counts APID 1072, 1088, 1104 Byte 0100-0101 referenceInformation General Purpose Register (not EU-converted) delta_time tx latest leading edge coarse counts APID 1072, 1088, 1104 Byte 0054-0056 referenceInformation Latest Leading Start Time Tag-acquired leading start time tag value (paired with trailing start time time tag value) coarse time in counts (not EU-converted) delta_time APID 1072, 1088, 1104 Byte 0106-0110 referenceInformation DFC Housekeeping Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time DFC Housekeeping Status Bits counts Tag write watchdog value counts APID 1072, 1088, 1104 Byte 0072-0073 referenceInformation Tag write watchdog value ; initialization Value (not EU-converted) delta_time Atmospheric Strong Range Window Start Reg clock cycles APID 1072, 1088, 1104 Byte 0081-0083 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the Atmospheric range window for the strong spot. (not EU-converted) delta_time Duplicate time tag removal counts APID 1072, 1088, 1104 Byte 0066-0067 referenceInformation Duplicate time tag removal ; initialization Value (not EU-converted) delta_time tx latest trailing edge fine counts APID 1072, 1088, 1104 Byte 0057-0059 referenceInformation Latest trailing Start Time Tag-acquired trailing start time tag value (paired with trailing start time time tag value) cell counts (not EU-converted) delta_time Atmospheric Weak Range Window Width Reg clock cycles APID 1072, 1088, 1104 Byte 0094-0095 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the Atmospheric range window start and range window stop for the weak spot. (not EU-converted) delta_time Major frame frequency counts APID 1072, 1088, 1104 Byte 0074 referenceInformation The number of shots per major frame. (not EU-converted) delta_time Debug Status Bits counts APID 1072, 1088, 1104 Byte 0112-0114 referenceInformation Debug Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12. (not EU-converted) delta_time Configuration counts APID 1072, 1088, 1104 Byte 0075 referenceInformation Configuration bits (not EU-converted) delta_time tx latest trailing edge coarse counts APID 1072, 1088, 1104 Byte 0057-0059 referenceInformation Latest trailing Start Time Tag-acquired trailing start time tag value (paired with trailing start time time tag value) coarse time in counts (not EU-converted) delta_time Logical address for science data transmit counts APID 1072, 1088, 1104 Byte 0065 referenceInformation Logical address for science data transmit ; initialization Value (not EU-converted) delta_time Tag wait watchdog value counts APID 1072, 1088, 1104 Byte 0071 referenceInformation Tag wait watchdog value ; initialization Value (not EU-converted) delta_time tx latest leading edge fine counts APID 1072, 1088, 1104 Byte 0054-0056 referenceInformation Latest Leading Start Time Tag-acquired leading start time tag value (paired with trailing start time time tag value) cell counts (not EU-converted) delta_time Atmospheric Weak Range Window Start Reg clock cycles APID 1072, 1088, 1104 Byte 0091-0093 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the Atmospheric range window for the weak spot. (not EU-converted) delta_time Atmospheric Strong Range Window Width Reg clock cycles APID 1072, 1088, 1104 Byte 0084-0085 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the Atmospheric range window start and range window stop for the strong spot. (not EU-converted) delta_time IMET at 1 pps counts APID 1072, 1088, 1104 Byte 0016-0021 referenceInformation ATLAS flight s/w 25 MHz IMET counter value when 1PPS is received (not EU-converted) delta_time Debug Control Register counts APID 1072, 1088, 1104 Byte 0096-0099 referenceInformation Debug Control Register (not EU-converted) delta_time Calibration request interval from TDC counts APID 1072, 1088, 1104 Byte 0068 referenceInformation Calibration request interval from TDC (not EU-converted) delta_time EDAC Status Bits counts APID 1072, 1088, 1104 Byte 102-105 referenceInformation EDAC Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time counts Altimetric Latest Calibration Rising APID 1072, 1088, 1104 Byte 0050-0051 referenceInformation The PCE latest calibration value for the rising edge (not EU-converted) delta_time PCE Major frame counter counts APID 1072, 1088, 1104 Byte 0030-0033 referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time IMET at first T0 after 1 pps counts APID 1072, 1088, 1104 Byte 0022-0027 referenceInformation ATLAS flight s/w 25 MHz IMET counter value when 1PPS is received (not EU-converted) delta_time Last Opcode Received counts APID 1072, 1088, 1104 Byte 0064 referenceInformation Indicates the last good opcode received prior to the Major Frame Packet being transmitted; 0xFF indicates an error condition of either protocol ID mismatch, invalid opcode, or invalid length (not EU-converted) delta_time Altimetric Weak Range Window Width Reg counts APID 1072, 1088, 1104 Byte 0089-0090 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the range window start and range window stop for the weak spot. (not EU-converted) delta_time MET 1pps counter counts APID 1072, 1088, 1104 Byte 0012-0015 referenceInformation ATLAS flight s/w 1PPS counter (not EU-converted) delta_time DFC Status Bits counts APID 1072, 1088, 1104 Byte 0111 referenceInformation DFC Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time Altimetric Latest Calibration Falling counts APID 1072, 1088, 1104 Byte 0052-0053 referenceInformation The PCE latest calibration value for the falling edge. (not EU-converted) delta_time delta_time This DFCx_hk is a diagnostic packet (APID 1072, 1088, 1104) that contains some of the parameters normally part of APID 1254, 1264, 1274 (as sequence flag 01). Also know as the PCE Altimetric Science Data Major Frame described in ICESat-2-MEB-SPEC-0875, section 5.13 Table 19. The data in the group are neither calibrated nor EU-converted, but preserved from ATL01 in order provided diagnostics for TOF processing. Data within this group are stored at the data rate of the source APID (nominally 50 Hz). DS for 2 bytes 1 Dimension Scale 1 2 referenceInformation Dimension scale for an array of 2 samples. DS for 4 bytes 1 Dimension Scale 1 4 referenceInformation Dimension scale for an array of 4 bytes. Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. GPS seconds at the Major Frame seconds ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation GPS seconds at the Major Frame delta_time Band Mask counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Band Mask. Each byte corresponds to a single Band, in the order of 1-4. delta_time AMET seconds at the Major Frame seconds ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation AMET seconds at the Major Frame delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Band Channel Mask counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Band Channel Mask. (Bands 1-4) delta_time PCE Major frame counter counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time Number of bands counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Number of bands. delta_time delta_time ds_4bytes ds_2samples The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation FSW error flags ../delta_time Error Flags counts Day/Night flag counts ATL01/atlas/pcex/a_pmf_algorithm_science 0 1 referenceInformation ATLAS flight software Day/Night Flag associated with the major frame. 0= day, 1 =night. Based on an algorithm determination of the background rate, not on the actual position of the sun. ../delta_time day night 0 1 Decision Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w Decision Flags associated with the major frame. indication if there was an error or if no science data is sent and why ../delta_time Flywheel counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Flywheel associated with the major frame. ../delta_time Signal Found Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w signal event flags associated with the major frame. ../delta_time The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation FSW error flags ../delta_time Error Flags counts Day/Night flag counts ATL01/atlas/pcex/a_pmf_algorithm_science 0 1 referenceInformation ATLAS flight software Day/Night Flag associated with the major frame. 0= day, 1 =night. Based on an algorithm determination of the background rate, not on the actual position of the sun. ../delta_time day night 0 1 Decision Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w Decision Flags associated with the major frame. indication if there was an error or if no science data is sent and why ../delta_time Flywheel counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Flywheel associated with the major frame. ../delta_time Signal Found Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w signal event flags associated with the major frame. ../delta_time The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Histogram Dimension Scale seconds ATL02 referenceInformation Relative bin values of windowed, peak-centered TOF histograms. Peak value = 0 Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for Strong Channels 1 Dimension Scale 1 16 referenceInformation Dimension scale for strong channels. DS for Weak Channels 1 Dimension Scale 1 4 referenceInformation Dimension scale for weak channels. Channel Mask Strong counts ATL01/atlas/pcex/a_alt_science referenceInformation Channel Mask for DLBOs. The 16 flags are a logical OR of the two band offset masks for strong beam delta_time Altimetric Latest Calibration Rising seconds/cell Derived via L1B ATBD referenceInformation The smoothed, calibrated value for the rising edge used to convert cell counts to units of time. time per cell count based on USO for each PCE. delta_time Altimetric Latest Calibration Falling seconds/cell Derived via L1B ATBD referenceInformation The smoothed, calibrated value for the falling edge used to convert cell counts to units of time. time per cell count based on USO for each PCE. delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PCE Major frame counter counts ATL02 referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Number Downlink Bands counts ATL01/atlas/pcex/a_alt_science referenceInformation Number of bands (in addition to the nominal 1 band) selected for downlink. delta_time Channel Mask Weak counts ATL01/atlas/pcex/a_alt_science referenceInformation Channel Mask for DLBOs. The 4 flags are a logical OR of the two band offset masks for weak beam delta_time delta_time ds_weak_channel_index ds_strong_channel_index ds_hist The PCE Altimetry Science Packet data common to both beams (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Band2 Width seconds L1A ATBD physicalMeasurement Width of downlink band2. ../delta_time Band1 Offset L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band1. ../delta_time seconds Band1 Width L1A ATBD physicalMeasurement Width of downlink band1. ../delta_time seconds Altimetric Range Window Width seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds from the range window start and range window stop ../delta_time Center-aligned TOF Histogram counts ATL02 qualityInformation Per-major frame, peak-aligned, windowed time-of-flight histograms. ../ds_hist ../delta_time Altimetric Range Window Start seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds between the transmit pulse and the start of the altimetric range window for the beam ../delta_time Band2 Offset seconds L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band2. ../delta_time Number of photons counts Derived auxiliaryInformation Number of photons within each major frame. ../delta_time Photon Index Begin counts Derived auxiliaryInformation Index (1-based) within the photon-rate data of the first photon within each major frame. ../delta_time The PCE Altimetry Science Packet specific to a beam (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The Time of Day for the specific Transmit (TX) pulse associated with the Received (RX) event. (see L1B ATBD section 5 time of flight), relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. photon event counter counts Derived as part of Photon ID referenceInformation photon event counter is part of photon ID and will count from 1 for each channel until reset by laser pulse counter. If ph_id_count is 0, then there was a transmit pulse without any received photons. In this case, the transmit portion of the alt_science packet is valid, but the receive portion is all 0s and should not be used. delta_time Time of Flight ATL02 ATBD physicalMeasurement Time of flight (TOF); the round trip time in seconds of the received photon relative to the beam's zero range point (ZRP). Computed from the Transmit (Tx) and Receive (Rx) Time-of-flight components and then calibrated to the centroid of the transmit pulse. delta_time seconds Other Transmit Time from LL seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Time of flight from the PCE-specific leading-lower (LL) threshold (tx_ll_tof) to the detected other transmit pulse edge. For PCE1, this is the time from the PCE1 LL to the Transmit Leading Upper edge (LU) threshold; for PCE2, this is the time from the PCE2 LL to the Transmit Trailing Upper edge (TU) threshold; and for PCE3, this is the time from the PCE3 LL to the Transmit Trailing Lower edge (TL) threshold. delta_time laser pulse counter counts Derived as part of Photon ID referenceInformation laser pulse counter is part of photon ID and will count from 1 to 200 and reset for each new major frame (major_fram_id). If the corresponding ph_id_count is 0, then there was a transmit pulse without any received photons. delta_time rx downlink band id counts ATL01/atlas/pcex/a_alt_science_ph RX data 0 1 referenceInformation Flag to indicate downlink band id associated with the received rx_tof (received photon event). A value of 0 indicates the photon corresponds to band1; A value of 1 indicates the photon corresponds to band2. Corresponding parameters are band_width, band_offset and band_eventcount. delta_time band1 band2 0 1 Receive channel id 1 Derived as part of Photon ID 1 120 referenceInformation Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120). delta_time Transmit LL time from T0 seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Transmit (Tx) Leading Lower (LL) time of flight (TOF); the round trip time in seconds from the detected lower leading edge of the transmit pulse relative to the ATLAS T0. Includes all calibrations of coarse and fine counts. delta_time TOF Flag counts L1B ATBD Sect 2.5.4 1 18 referenceInformation Time Of Flight center correction flag. Values indicate what components were used to adjust the TOF to the centroid of the Tx pulse, based on the alignment of Tx components across all 3 PCEs. 1=LL_LU_TU_TL; 2=LL_TU_TL; 3=LL_LU_TL; 4=LL_LU_TU; 5=LL_TL; 6=LL_TU; 7=LL_LU; 8=LL. Values greater than 10 indicate the same sequence of conditions indicated for a potential TEP photon. delta_time LL_LU_TU_TL LL_TU_TL LL_LU_TL LL_LU_TU LL_TL LL_TU LL_LU LL TEP_LL_LU_TU_TL TEP_LL_TU_TL TEP_LL_LU_TL TEP_LL_LU_TU TEP_LL_TL TEP_LL_TU TEP_LL_LU TEP_LL 1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 PCE Major frame counter counts Retained from latest a_alt_science packet referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time delta_time Group contains the PCE Altimetric received photon event (ph) decommutated data and its matching Transmit time tag data. Note the Transmit time tag data are repeated for each received photon event. Data is from Altimetry Science Packet (alt_sci_tlm) APID 1254, 1264, 1274 with Sequence Flag = 0 or 2. See ICESat-2-MEB-SPEC-0875, section 5.12, SPACEWIRE: TIME TAG SCIENCE DATA FORMAT Data within this group are stored at the data rate of the source photon events. (varies by detection; nominal value is sixty thousand per second, derived from laser_rate * photons_per_shot * beams_per_pce; where laser_rate=10000, photons_per_shot=3, beams_per_pce=2.) Band2 Width seconds L1A ATBD physicalMeasurement Width of downlink band2. ../delta_time Band1 Offset L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band1. ../delta_time seconds Band1 Width L1A ATBD physicalMeasurement Width of downlink band1. ../delta_time seconds Altimetric Range Window Width seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds from the range window start and range window stop ../delta_time Center-aligned TOF Histogram counts ATL02 qualityInformation Per-major frame, peak-aligned, windowed time-of-flight histograms. ../ds_hist ../delta_time Altimetric Range Window Start seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds between the transmit pulse and the start of the altimetric range window for the beam ../delta_time Band2 Offset seconds L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band2. ../delta_time Number of photons counts Derived auxiliaryInformation Number of photons within each major frame. ../delta_time Photon Index Begin counts Derived auxiliaryInformation Index (1-based) within the photon-rate data of the first photon within each major frame. ../delta_time The PCE Altimetry Science Packet specific to a beam (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The Time of Day for the specific Transmit (TX) pulse associated with the Received (RX) event. (see L1B ATBD section 5 time of flight), relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. photon event counter counts Derived as part of Photon ID referenceInformation photon event counter is part of photon ID and will count from 1 for each channel until reset by laser pulse counter. If ph_id_count is 0, then there was a transmit pulse without any received photons. In this case, the transmit portion of the alt_science packet is valid, but the receive portion is all 0s and should not be used. delta_time Time of Flight ATL02 ATBD physicalMeasurement Time of flight (TOF); the round trip time in seconds of the received photon relative to the beam's zero range point (ZRP). Computed from the Transmit (Tx) and Receive (Rx) Time-of-flight components and then calibrated to the centroid of the transmit pulse. delta_time seconds Other Transmit Time from LL seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Time of flight from the PCE-specific leading-lower (LL) threshold (tx_ll_tof) to the detected other transmit pulse edge. For PCE1, this is the time from the PCE1 LL to the Transmit Leading Upper edge (LU) threshold; for PCE2, this is the time from the PCE2 LL to the Transmit Trailing Upper edge (TU) threshold; and for PCE3, this is the time from the PCE3 LL to the Transmit Trailing Lower edge (TL) threshold. delta_time laser pulse counter counts Derived as part of Photon ID referenceInformation laser pulse counter is part of photon ID and will count from 1 to 200 and reset for each new major frame (major_fram_id). If the corresponding ph_id_count is 0, then there was a transmit pulse without any received photons. delta_time rx downlink band id counts ATL01/atlas/pcex/a_alt_science_ph RX data 0 1 referenceInformation Flag to indicate downlink band id associated with the received rx_tof (received photon event). A value of 0 indicates the photon corresponds to band1; A value of 1 indicates the photon corresponds to band2. Corresponding parameters are band_width, band_offset and band_eventcount. delta_time band1 band2 0 1 Receive channel id 1 Derived as part of Photon ID 1 120 referenceInformation Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120). delta_time Transmit LL time from T0 seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Transmit (Tx) Leading Lower (LL) time of flight (TOF); the round trip time in seconds from the detected lower leading edge of the transmit pulse relative to the ATLAS T0. Includes all calibrations of coarse and fine counts. delta_time TOF Flag counts L1B ATBD Sect 2.5.4 1 18 referenceInformation Time Of Flight center correction flag. Values indicate what components were used to adjust the TOF to the centroid of the Tx pulse, based on the alignment of Tx components across all 3 PCEs. 1=LL_LU_TU_TL; 2=LL_TU_TL; 3=LL_LU_TL; 4=LL_LU_TU; 5=LL_TL; 6=LL_TU; 7=LL_LU; 8=LL. Values greater than 10 indicate the same sequence of conditions indicated for a potential TEP photon. delta_time LL_LU_TU_TL LL_TU_TL LL_LU_TL LL_LU_TU LL_TL LL_TU LL_LU LL TEP_LL_LU_TU_TL TEP_LL_TU_TL TEP_LL_LU_TL TEP_LL_LU_TU TEP_LL_TL TEP_LL_TU TEP_LL_LU TEP_LL 1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 PCE Major frame counter counts Retained from latest a_alt_science packet referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time delta_time Group contains the PCE Altimetric received photon event (ph) decommutated data and its matching Transmit time tag data. Note the Transmit time tag data are repeated for each received photon event. Data is from Altimetry Science Packet (alt_sci_tlm) APID 1254, 1264, 1274 with Sequence Flag = 0 or 2. See ICESat-2-MEB-SPEC-0875, section 5.12, SPACEWIRE: TIME TAG SCIENCE DATA FORMAT Data within this group are stored at the data rate of the source photon events. (varies by detection; nominal value is sixty thousand per second, derived from laser_rate * photons_per_shot * beams_per_pce; where laser_rate=10000, photons_per_shot=3, beams_per_pce=2.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for ATM histogram bins 1 Dimension Scale 1 467 referenceInformation Dimension scale for atmosphere histogram bins. counts Atmospheric Range Window Shift ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of bins the range window start of one of the histograms was shifted to align them before they are added together. delta_time Atmospheric Range Window Start seconds ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of seconds between the transmit pulse and the start of the Atmospheric range window delta_time Atmospheric Range Window Width seconds ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of seconds from the Atmospheric range window start and range window stop. delta_time PCE Major frame counter counts ATL01/atlas/pcex/a_atm_hist_x referenceInformation Major Frame Counter - The major frame counter is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Atmospheric Science Histogram counts ATL01/atlas/pcex/a_atm_hist_x referenceInformation The histogram bins for the Atmospheric beam.Once every 400 shots ( laser pulses). Bin 1 (clouds) is nearest to spacecraft .Bin 467 is under ground. delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 delta_time ds_hist_bin_index Contains parameters relating to the PCE Atmospheric Data Histograms. Normally 25 hz. (APID 1255, 1259, 1265, 1269, 1275, 1279). P1 S,P1 W, P2 S, P2 W, P3 S, P3 W. Data in this group is stored at a 25hz (25 per second) rate. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. AutoRestartDFCCount counts APID 1073, 1089, 1105 Byte 0090-0091 referenceInformation Number of DFC Auto Restarts delta_time cmd_err_cntr counts APID 1073, 1089, 1105 Byte 0012-0012 referenceInformation Command error counter delta_time cmd_suc_cntr counts APID 1073, 1089, 1105 Byte 0013-0013 referenceInformation Command success counter. delta_time ActiveKnobsTable counts APID 1073, 1089, 1105 Byte 0037-0037 referenceInformation The active knobs table. delta_time Mode counts APID 1073, 1089, 1105 Byte 0036-0036 0 5 referenceInformation PCE Mode. 0=STBY; 1=Science; 2=Test; 3=Manual; 4=Radio; 5=Unknown delta_time STBY Science Test Manual Radio Test 0 1 2 3 4 5 delta_time PCE Diagnostic Telemetry Packet from one of the following APIDs : 1073, 1089, 1105 (each APID is associated with a specific PCE). Packet Frequency is 1 Hertz. Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for 50 bytes 1 ATL01/atlas/pcex/a_sxp_ssr 1 50 referenceInformation Dimension scale for an array of 50 samples. delta_time latitude longitude latitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Latitude delta_time longitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Longitude delta_time First Major Frame cosZ counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the solar zenith angle delta_time latitude longitude PCE Major frame counter counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time latitude longitude cosB counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the off-nadir angle as calculated onboard from the spacecraft information delta_time latitude longitude srm 1 ATL01/atlas/pcex/a_sxp_ssr referenceInformation Surface type, vegetation and coastline information from the SRM. (bit 0-1 = surface type (0=ocean, 1=land, 2=sea ice, 3=land ice). Bit 2 = vegetation present, Bit 3 = coastline present) delta_time latitude longitude delta_time ds_50samples SBC Extrapolation Task telemetry containing Flight Science Receiver Algorithm team requested telemetry for the first set of PCE extrapolation data for a major frame.: lat, long, range, nadir angle, etc. (from APIDs 1152 thru 1157) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the 50 laser pulses used for background, in seconds relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. delta_time Weak background counts counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w indicates for the beam the # of counted time tags (BackgroundCounts_50Shot) during the range windows associated with a set of 50 laser pulses of the major frame. delta_time counts Strong background counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w indicates for the beam the # of counted time tags (BackgroundCounts_50Shot) during the range windows associated with a set of 50 laser pulses of the major frame. delta_time PCE Major frame counter counts Derived referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 delta_time The background data is specific to each beam and reported at a 50-shot rate. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Group contains the Photon Counting Electronics x (PCEx) packet decommutated data Data within this group are stored at the data rate of the source PCE Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for 50 bytes 1 ATL01/atlas/pcex/a_sxp_ssr 1 50 referenceInformation Dimension scale for an array of 50 samples. delta_time latitude longitude latitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Latitude delta_time longitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Longitude delta_time First Major Frame cosZ counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the solar zenith angle delta_time latitude longitude PCE Major frame counter counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time latitude longitude cosB counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the off-nadir angle as calculated onboard from the spacecraft information delta_time latitude longitude srm 1 ATL01/atlas/pcex/a_sxp_ssr referenceInformation Surface type, vegetation and coastline information from the SRM. (bit 0-1 = surface type (0=ocean, 1=land, 2=sea ice, 3=land ice). Bit 2 = vegetation present, Bit 3 = coastline present) delta_time latitude longitude delta_time ds_50samples SBC Extrapolation Task telemetry containing Flight Science Receiver Algorithm team requested telemetry for the first set of PCE extrapolation data for a major frame.: lat, long, range, nadir angle, etc. (from APIDs 1152 thru 1157) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. last sequence packet count counts APID 1072, 1088, 1104 Byte 0060-0061 referenceInformation CCSDS Packet Sequence Count value of the last downlink packet prior to the major frame. This should be the last packet associated with the previous major frame. That packet should contain the last Tx/RX data for the last shot of the previous major frame. (not EU-converted) delta_time Altimetric Weak Range Window Start Reg counts APID 1072, 1088, 1104 Byte 0086-0088 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the altimetric range window for the weak spot. (not EU-converted) delta_time T0 counter counts APID 1072, 1088, 1104 Byte 0028-0029 referenceInformation ATLAS flight s/w T0 counter that clears with 1PPS (not EU-converted) delta_time SpW Not Ready Counter counts APID 1072, 1088, 1104 Byte 0115 referenceInformation Counts each time SpW causes DFC to wait to transmit data to back-end (Status Only) (not EU-converted) delta_time Science Data Segment Limit Size counts APID 1072, 1088, 1104 Byte 0069-0070 referenceInformation Science Data Segment Limit Size ; initialization Value (not EU-converted) delta_time Altimetric Strong Range Window Start Reg counts APID 1072, 1088, 1104 Byte 0076-0078 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the altimetric range window for the strong spot (not EU-converted) delta_time strong spot tag counter counts APID 1072, 1088, 1104 Byte 0034-0041 referenceInformation The number of events received by the DFC on channels 1 through 16 summed over 50 range window openings. The four elements of the array correspond to dividing the major frame up into 50 shots. The last element of the array can be 49 or 51 shots depending on the alignment of the range windows with respect to the major frame. Note that these counts are time tag counts and are subject to all the limitations and behaviors associated with time tags (duplicates, FIFO overflows, etc.). (not EU-converted) delta_time Altimetric Strong Range Window Width Reg counts APID 1072, 1088, 1104 Byte 0079-0080 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the range window start and range window stop for the strong spot. (not EU-converted) delta_time weak spot tag counter counts APID 1072, 1088, 1104 Byte 0042-48 referenceInformation The number of events received by the DFC on channels 17 through 20 summed over 50 range window openings. The four elements of the array correspond to dividing the major frame up into 50 shots. The last element of the array can be 49 or 51 shots depending on the alignment of the range windows with respect to the major frame. Note that these counts are time tag counts and are subject to all the limitations and behaviors associated with time tags (duplicates, FIFO overflows, etc.). (not EU-converted) delta_time Command Counter counts APID 1072, 1088, 1104 Byte 0062-0063 referenceInformation Command Counter; Indicates the number of good commands received by the DFC prior to the Major Frame Packet being transmitted (not EU-converted) delta_time General Purpose Register counts APID 1072, 1088, 1104 Byte 0100-0101 referenceInformation General Purpose Register (not EU-converted) delta_time tx latest leading edge coarse counts APID 1072, 1088, 1104 Byte 0054-0056 referenceInformation Latest Leading Start Time Tag-acquired leading start time tag value (paired with trailing start time time tag value) coarse time in counts (not EU-converted) delta_time APID 1072, 1088, 1104 Byte 0106-0110 referenceInformation DFC Housekeeping Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time DFC Housekeeping Status Bits counts Tag write watchdog value counts APID 1072, 1088, 1104 Byte 0072-0073 referenceInformation Tag write watchdog value ; initialization Value (not EU-converted) delta_time Atmospheric Strong Range Window Start Reg clock cycles APID 1072, 1088, 1104 Byte 0081-0083 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the Atmospheric range window for the strong spot. (not EU-converted) delta_time Duplicate time tag removal counts APID 1072, 1088, 1104 Byte 0066-0067 referenceInformation Duplicate time tag removal ; initialization Value (not EU-converted) delta_time tx latest trailing edge fine counts APID 1072, 1088, 1104 Byte 0057-0059 referenceInformation Latest trailing Start Time Tag-acquired trailing start time tag value (paired with trailing start time time tag value) cell counts (not EU-converted) delta_time Atmospheric Weak Range Window Width Reg clock cycles APID 1072, 1088, 1104 Byte 0094-0095 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the Atmospheric range window start and range window stop for the weak spot. (not EU-converted) delta_time Major frame frequency counts APID 1072, 1088, 1104 Byte 0074 referenceInformation The number of shots per major frame. (not EU-converted) delta_time Debug Status Bits counts APID 1072, 1088, 1104 Byte 0112-0114 referenceInformation Debug Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12. (not EU-converted) delta_time Configuration counts APID 1072, 1088, 1104 Byte 0075 referenceInformation Configuration bits (not EU-converted) delta_time tx latest trailing edge coarse counts APID 1072, 1088, 1104 Byte 0057-0059 referenceInformation Latest trailing Start Time Tag-acquired trailing start time tag value (paired with trailing start time time tag value) coarse time in counts (not EU-converted) delta_time Logical address for science data transmit counts APID 1072, 1088, 1104 Byte 0065 referenceInformation Logical address for science data transmit ; initialization Value (not EU-converted) delta_time Tag wait watchdog value counts APID 1072, 1088, 1104 Byte 0071 referenceInformation Tag wait watchdog value ; initialization Value (not EU-converted) delta_time tx latest leading edge fine counts APID 1072, 1088, 1104 Byte 0054-0056 referenceInformation Latest Leading Start Time Tag-acquired leading start time tag value (paired with trailing start time time tag value) cell counts (not EU-converted) delta_time Atmospheric Weak Range Window Start Reg clock cycles APID 1072, 1088, 1104 Byte 0091-0093 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the transmit pulse and the start of the Atmospheric range window for the weak spot. (not EU-converted) delta_time Atmospheric Strong Range Window Width Reg clock cycles APID 1072, 1088, 1104 Byte 0084-0085 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the Atmospheric range window start and range window stop for the strong spot. (not EU-converted) delta_time IMET at 1 pps counts APID 1072, 1088, 1104 Byte 0016-0021 referenceInformation ATLAS flight s/w 25 MHz IMET counter value when 1PPS is received (not EU-converted) delta_time Debug Control Register counts APID 1072, 1088, 1104 Byte 0096-0099 referenceInformation Debug Control Register (not EU-converted) delta_time Calibration request interval from TDC counts APID 1072, 1088, 1104 Byte 0068 referenceInformation Calibration request interval from TDC (not EU-converted) delta_time EDAC Status Bits counts APID 1072, 1088, 1104 Byte 102-105 referenceInformation EDAC Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time counts Altimetric Latest Calibration Rising APID 1072, 1088, 1104 Byte 0050-0051 referenceInformation The PCE latest calibration value for the rising edge (not EU-converted) delta_time PCE Major frame counter counts APID 1072, 1088, 1104 Byte 0030-0033 referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time IMET at first T0 after 1 pps counts APID 1072, 1088, 1104 Byte 0022-0027 referenceInformation ATLAS flight s/w 25 MHz IMET counter value when 1PPS is received (not EU-converted) delta_time Last Opcode Received counts APID 1072, 1088, 1104 Byte 0064 referenceInformation Indicates the last good opcode received prior to the Major Frame Packet being transmitted; 0xFF indicates an error condition of either protocol ID mismatch, invalid opcode, or invalid length (not EU-converted) delta_time Altimetric Weak Range Window Width Reg counts APID 1072, 1088, 1104 Byte 0089-0090 referenceInformation Value of register set in initialization command for the number of 10ns ticks between the range window start and range window stop for the weak spot. (not EU-converted) delta_time MET 1pps counter counts APID 1072, 1088, 1104 Byte 0012-0015 referenceInformation ATLAS flight s/w 1PPS counter (not EU-converted) delta_time DFC Status Bits counts APID 1072, 1088, 1104 Byte 0111 referenceInformation DFC Status Bits. Defined in ATLAS MEB PCE DFC FPGA Specification, ICESat-2-MEB-SPEC-0875, section 5.12 (not EU-converted) delta_time Altimetric Latest Calibration Falling counts APID 1072, 1088, 1104 Byte 0052-0053 referenceInformation The PCE latest calibration value for the falling edge. (not EU-converted) delta_time delta_time This DFCx_hk is a diagnostic packet (APID 1072, 1088, 1104) that contains some of the parameters normally part of APID 1254, 1264, 1274 (as sequence flag 01). Also know as the PCE Altimetric Science Data Major Frame described in ICESat-2-MEB-SPEC-0875, section 5.13 Table 19. The data in the group are neither calibrated nor EU-converted, but preserved from ATL01 in order provided diagnostics for TOF processing. Data within this group are stored at the data rate of the source APID (nominally 50 Hz). DS for 2 bytes 1 Dimension Scale 1 2 referenceInformation Dimension scale for an array of 2 samples. DS for 4 bytes 1 Dimension Scale 1 4 referenceInformation Dimension scale for an array of 4 bytes. Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. GPS seconds at the Major Frame seconds ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation GPS seconds at the Major Frame delta_time Band Mask counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Band Mask. Each byte corresponds to a single Band, in the order of 1-4. delta_time AMET seconds at the Major Frame seconds ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation AMET seconds at the Major Frame delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Band Channel Mask counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Band Channel Mask. (Bands 1-4) delta_time PCE Major frame counter counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time Number of bands counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Number of bands. delta_time delta_time ds_4bytes ds_2samples The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation FSW error flags ../delta_time Error Flags counts Day/Night flag counts ATL01/atlas/pcex/a_pmf_algorithm_science 0 1 referenceInformation ATLAS flight software Day/Night Flag associated with the major frame. 0= day, 1 =night. Based on an algorithm determination of the background rate, not on the actual position of the sun. ../delta_time day night 0 1 Decision Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w Decision Flags associated with the major frame. indication if there was an error or if no science data is sent and why ../delta_time Flywheel counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Flywheel associated with the major frame. ../delta_time Signal Found Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w signal event flags associated with the major frame. ../delta_time The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation FSW error flags ../delta_time Error Flags counts Day/Night flag counts ATL01/atlas/pcex/a_pmf_algorithm_science 0 1 referenceInformation ATLAS flight software Day/Night Flag associated with the major frame. 0= day, 1 =night. Based on an algorithm determination of the background rate, not on the actual position of the sun. ../delta_time day night 0 1 Decision Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w Decision Flags associated with the major frame. indication if there was an error or if no science data is sent and why ../delta_time Flywheel counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight software Flywheel associated with the major frame. ../delta_time Signal Found Flags counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w signal event flags associated with the major frame. ../delta_time The PCE PMF Algorithm Science data group. Contains outputs from the onboard receiver algorithm software. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Histogram Dimension Scale seconds ATL02 referenceInformation Relative bin values of windowed, peak-centered TOF histograms. Peak value = 0 Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for Strong Channels 1 Dimension Scale 1 16 referenceInformation Dimension scale for strong channels. DS for Weak Channels 1 Dimension Scale 1 4 referenceInformation Dimension scale for weak channels. Channel Mask Strong counts ATL01/atlas/pcex/a_alt_science referenceInformation Channel Mask for DLBOs. The 16 flags are a logical OR of the two band offset masks for strong beam delta_time Altimetric Latest Calibration Rising seconds/cell Derived via L1B ATBD referenceInformation The smoothed, calibrated value for the rising edge used to convert cell counts to units of time. time per cell count based on USO for each PCE. delta_time Altimetric Latest Calibration Falling seconds/cell Derived via L1B ATBD referenceInformation The smoothed, calibrated value for the falling edge used to convert cell counts to units of time. time per cell count based on USO for each PCE. delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PCE Major frame counter counts ATL02 referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Number Downlink Bands counts ATL01/atlas/pcex/a_alt_science referenceInformation Number of bands (in addition to the nominal 1 band) selected for downlink. delta_time Channel Mask Weak counts ATL01/atlas/pcex/a_alt_science referenceInformation Channel Mask for DLBOs. The 4 flags are a logical OR of the two band offset masks for weak beam delta_time delta_time ds_weak_channel_index ds_strong_channel_index ds_hist The PCE Altimetry Science Packet data common to both beams (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Band2 Width seconds L1A ATBD physicalMeasurement Width of downlink band2. ../delta_time Band1 Offset L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band1. ../delta_time seconds Band1 Width L1A ATBD physicalMeasurement Width of downlink band1. ../delta_time seconds Altimetric Range Window Width seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds from the range window start and range window stop ../delta_time Center-aligned TOF Histogram counts ATL02 qualityInformation Per-major frame, peak-aligned, windowed time-of-flight histograms. ../ds_hist ../delta_time Altimetric Range Window Start seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds between the transmit pulse and the start of the altimetric range window for the beam ../delta_time Band2 Offset seconds L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band2. ../delta_time Number of photons counts Derived auxiliaryInformation Number of photons within each major frame. ../delta_time Photon Index Begin counts Derived auxiliaryInformation Index (1-based) within the photon-rate data of the first photon within each major frame. ../delta_time The PCE Altimetry Science Packet specific to a beam (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The Time of Day for the specific Transmit (TX) pulse associated with the Received (RX) event. (see L1B ATBD section 5 time of flight), relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. photon event counter counts Derived as part of Photon ID referenceInformation photon event counter is part of photon ID and will count from 1 for each channel until reset by laser pulse counter. If ph_id_count is 0, then there was a transmit pulse without any received photons. In this case, the transmit portion of the alt_science packet is valid, but the receive portion is all 0s and should not be used. delta_time Time of Flight ATL02 ATBD physicalMeasurement Time of flight (TOF); the round trip time in seconds of the received photon relative to the beam's zero range point (ZRP). Computed from the Transmit (Tx) and Receive (Rx) Time-of-flight components and then calibrated to the centroid of the transmit pulse. delta_time seconds Other Transmit Time from LL seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Time of flight from the PCE-specific leading-lower (LL) threshold (tx_ll_tof) to the detected other transmit pulse edge. For PCE1, this is the time from the PCE1 LL to the Transmit Leading Upper edge (LU) threshold; for PCE2, this is the time from the PCE2 LL to the Transmit Trailing Upper edge (TU) threshold; and for PCE3, this is the time from the PCE3 LL to the Transmit Trailing Lower edge (TL) threshold. delta_time laser pulse counter counts Derived as part of Photon ID referenceInformation laser pulse counter is part of photon ID and will count from 1 to 200 and reset for each new major frame (major_fram_id). If the corresponding ph_id_count is 0, then there was a transmit pulse without any received photons. delta_time rx downlink band id counts ATL01/atlas/pcex/a_alt_science_ph RX data 0 1 referenceInformation Flag to indicate downlink band id associated with the received rx_tof (received photon event). A value of 0 indicates the photon corresponds to band1; A value of 1 indicates the photon corresponds to band2. Corresponding parameters are band_width, band_offset and band_eventcount. delta_time band1 band2 0 1 Receive channel id 1 Derived as part of Photon ID 1 120 referenceInformation Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120). delta_time Transmit LL time from T0 seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Transmit (Tx) Leading Lower (LL) time of flight (TOF); the round trip time in seconds from the detected lower leading edge of the transmit pulse relative to the ATLAS T0. Includes all calibrations of coarse and fine counts. delta_time TOF Flag counts L1B ATBD Sect 2.5.4 1 18 referenceInformation Time Of Flight center correction flag. Values indicate what components were used to adjust the TOF to the centroid of the Tx pulse, based on the alignment of Tx components across all 3 PCEs. 1=LL_LU_TU_TL; 2=LL_TU_TL; 3=LL_LU_TL; 4=LL_LU_TU; 5=LL_TL; 6=LL_TU; 7=LL_LU; 8=LL. Values greater than 10 indicate the same sequence of conditions indicated for a potential TEP photon. delta_time LL_LU_TU_TL LL_TU_TL LL_LU_TL LL_LU_TU LL_TL LL_TU LL_LU LL TEP_LL_LU_TU_TL TEP_LL_TU_TL TEP_LL_LU_TL TEP_LL_LU_TU TEP_LL_TL TEP_LL_TU TEP_LL_LU TEP_LL 1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 PCE Major frame counter counts Retained from latest a_alt_science packet referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time delta_time Group contains the PCE Altimetric received photon event (ph) decommutated data and its matching Transmit time tag data. Note the Transmit time tag data are repeated for each received photon event. Data is from Altimetry Science Packet (alt_sci_tlm) APID 1254, 1264, 1274 with Sequence Flag = 0 or 2. See ICESat-2-MEB-SPEC-0875, section 5.12, SPACEWIRE: TIME TAG SCIENCE DATA FORMAT Data within this group are stored at the data rate of the source photon events. (varies by detection; nominal value is sixty thousand per second, derived from laser_rate * photons_per_shot * beams_per_pce; where laser_rate=10000, photons_per_shot=3, beams_per_pce=2.) Band2 Width seconds L1A ATBD physicalMeasurement Width of downlink band2. ../delta_time Band1 Offset L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band1. ../delta_time seconds Band1 Width L1A ATBD physicalMeasurement Width of downlink band1. ../delta_time seconds Altimetric Range Window Width seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds from the range window start and range window stop ../delta_time Center-aligned TOF Histogram counts ATL02 qualityInformation Per-major frame, peak-aligned, windowed time-of-flight histograms. ../ds_hist ../delta_time Altimetric Range Window Start seconds ATL01/atlas/pcex/a_pmf_algorithm_science and L1B ATBD conversion referenceInformation The number of seconds between the transmit pulse and the start of the altimetric range window for the beam ../delta_time Band2 Offset seconds L1A ATBD physicalMeasurement Downlink band offset (DLBO) for band2. ../delta_time Number of photons counts Derived auxiliaryInformation Number of photons within each major frame. ../delta_time Photon Index Begin counts Derived auxiliaryInformation Index (1-based) within the photon-rate data of the first photon within each major frame. ../delta_time The PCE Altimetry Science Packet specific to a beam (PCEx_ALT_SCI_TLM_MID in APID 1254, 1264, 1274 sequence flag 01 (once per major frame). (see ICESat-2-MEB-SPEC-0875, section 5.12, Spacewire: Major Frame Packet Data Format Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The Time of Day for the specific Transmit (TX) pulse associated with the Received (RX) event. (see L1B ATBD section 5 time of flight), relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. photon event counter counts Derived as part of Photon ID referenceInformation photon event counter is part of photon ID and will count from 1 for each channel until reset by laser pulse counter. If ph_id_count is 0, then there was a transmit pulse without any received photons. In this case, the transmit portion of the alt_science packet is valid, but the receive portion is all 0s and should not be used. delta_time Time of Flight ATL02 ATBD physicalMeasurement Time of flight (TOF); the round trip time in seconds of the received photon relative to the beam's zero range point (ZRP). Computed from the Transmit (Tx) and Receive (Rx) Time-of-flight components and then calibrated to the centroid of the transmit pulse. delta_time seconds Other Transmit Time from LL seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Time of flight from the PCE-specific leading-lower (LL) threshold (tx_ll_tof) to the detected other transmit pulse edge. For PCE1, this is the time from the PCE1 LL to the Transmit Leading Upper edge (LU) threshold; for PCE2, this is the time from the PCE2 LL to the Transmit Trailing Upper edge (TU) threshold; and for PCE3, this is the time from the PCE3 LL to the Transmit Trailing Lower edge (TL) threshold. delta_time laser pulse counter counts Derived as part of Photon ID referenceInformation laser pulse counter is part of photon ID and will count from 1 to 200 and reset for each new major frame (major_fram_id). If the corresponding ph_id_count is 0, then there was a transmit pulse without any received photons. delta_time rx downlink band id counts ATL01/atlas/pcex/a_alt_science_ph RX data 0 1 referenceInformation Flag to indicate downlink band id associated with the received rx_tof (received photon event). A value of 0 indicates the photon corresponds to band1; A value of 1 indicates the photon corresponds to band2. Corresponding parameters are band_width, band_offset and band_eventcount. delta_time band1 band2 0 1 Receive channel id 1 Derived as part of Photon ID 1 120 referenceInformation Channel number assigned for each received photon event. This is part of the photon ID. Values range from 1 to 120 to span all channels and rise/fall edges. Values 1 to 60 are for falling edge; PCE1 (1 to 20), PCE 2 (21 to 40) and PCE3 (41 to 60). Values 61 to 120 are for rising edge; PCE1 (61 to 80), PCE 2 (81 to 100) and PC3 (101 to 120). delta_time Transmit LL time from T0 seconds ATL01/atlas/pcex/a_alt_science_ph TX data L1B ATBD section tof referenceInformation Transmit (Tx) Leading Lower (LL) time of flight (TOF); the round trip time in seconds from the detected lower leading edge of the transmit pulse relative to the ATLAS T0. Includes all calibrations of coarse and fine counts. delta_time TOF Flag counts L1B ATBD Sect 2.5.4 1 18 referenceInformation Time Of Flight center correction flag. Values indicate what components were used to adjust the TOF to the centroid of the Tx pulse, based on the alignment of Tx components across all 3 PCEs. 1=LL_LU_TU_TL; 2=LL_TU_TL; 3=LL_LU_TL; 4=LL_LU_TU; 5=LL_TL; 6=LL_TU; 7=LL_LU; 8=LL. Values greater than 10 indicate the same sequence of conditions indicated for a potential TEP photon. delta_time LL_LU_TU_TL LL_TU_TL LL_LU_TL LL_LU_TU LL_TL LL_TU LL_LU LL TEP_LL_LU_TU_TL TEP_LL_TU_TL TEP_LL_LU_TL TEP_LL_LU_TU TEP_LL_TL TEP_LL_TU TEP_LL_LU TEP_LL 1 2 3 4 5 6 7 8 11 12 13 14 15 16 17 18 PCE Major frame counter counts Retained from latest a_alt_science packet referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time delta_time Group contains the PCE Altimetric received photon event (ph) decommutated data and its matching Transmit time tag data. Note the Transmit time tag data are repeated for each received photon event. Data is from Altimetry Science Packet (alt_sci_tlm) APID 1254, 1264, 1274 with Sequence Flag = 0 or 2. See ICESat-2-MEB-SPEC-0875, section 5.12, SPACEWIRE: TIME TAG SCIENCE DATA FORMAT Data within this group are stored at the data rate of the source photon events. (varies by detection; nominal value is sixty thousand per second, derived from laser_rate * photons_per_shot * beams_per_pce; where laser_rate=10000, photons_per_shot=3, beams_per_pce=2.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for ATM histogram bins 1 Dimension Scale 1 467 referenceInformation Dimension scale for atmosphere histogram bins. counts Atmospheric Range Window Shift ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of bins the range window start of one of the histograms was shifted to align them before they are added together. delta_time Atmospheric Range Window Start seconds ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of seconds between the transmit pulse and the start of the Atmospheric range window delta_time Atmospheric Range Window Width seconds ATL01/atlas/pcex/a_atm_hist_x and L1B ATBD section ATM referenceInformation The number of seconds from the Atmospheric range window start and range window stop. delta_time PCE Major frame counter counts ATL01/atlas/pcex/a_atm_hist_x referenceInformation Major Frame Counter - The major frame counter is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Atmospheric Science Histogram counts ATL01/atlas/pcex/a_atm_hist_x referenceInformation The histogram bins for the Atmospheric beam.Once every 400 shots ( laser pulses). Bin 1 (clouds) is nearest to spacecraft .Bin 467 is under ground. delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 delta_time ds_hist_bin_index Contains parameters relating to the PCE Atmospheric Data Histograms. Normally 25 hz. (APID 1255, 1259, 1265, 1269, 1275, 1279). P1 S,P1 W, P2 S, P2 W, P3 S, P3 W. Data in this group is stored at a 25hz (25 per second) rate. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. AutoRestartDFCCount counts APID 1073, 1089, 1105 Byte 0090-0091 referenceInformation Number of DFC Auto Restarts delta_time cmd_err_cntr counts APID 1073, 1089, 1105 Byte 0012-0012 referenceInformation Command error counter delta_time cmd_suc_cntr counts APID 1073, 1089, 1105 Byte 0013-0013 referenceInformation Command success counter. delta_time ActiveKnobsTable counts APID 1073, 1089, 1105 Byte 0037-0037 referenceInformation The active knobs table. delta_time Mode counts APID 1073, 1089, 1105 Byte 0036-0036 0 5 referenceInformation PCE Mode. 0=STBY; 1=Science; 2=Test; 3=Manual; 4=Radio; 5=Unknown delta_time STBY Science Test Manual Radio Test 0 1 2 3 4 5 delta_time PCE Diagnostic Telemetry Packet from one of the following APIDs : 1073, 1089, 1105 (each APID is associated with a specific PCE). Packet Frequency is 1 Hertz. Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the major frame, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for 50 bytes 1 ATL01/atlas/pcex/a_sxp_ssr 1 50 referenceInformation Dimension scale for an array of 50 samples. delta_time latitude longitude latitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Latitude delta_time longitude degrees ATL01/atlas/pcex/a_sxp_ssr referenceInformation Longitude delta_time First Major Frame cosZ counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the solar zenith angle delta_time latitude longitude PCE Major frame counter counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. delta_time latitude longitude cosB counts ATL01/atlas/pcex/a_sxp_ssr referenceInformation Cosine of the off-nadir angle as calculated onboard from the spacecraft information delta_time latitude longitude srm 1 ATL01/atlas/pcex/a_sxp_ssr referenceInformation Surface type, vegetation and coastline information from the SRM. (bit 0-1 = surface type (0=ocean, 1=land, 2=sea ice, 3=land ice). Bit 2 = vegetation present, Bit 3 = coastline present) delta_time latitude longitude delta_time ds_50samples SBC Extrapolation Task telemetry containing Flight Science Receiver Algorithm team requested telemetry for the first set of PCE extrapolation data for a major frame.: lat, long, range, nadir angle, etc. (from APIDs 1152 thru 1157) Elapsed GPS seconds time seconds since 2018-01-01 Derived via L1B ATBD referenceInformation The time of the first TX pulse in the 50 laser pulses used for background, in seconds relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. delta_time Weak background counts counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w indicates for the beam the # of counted time tags (BackgroundCounts_50Shot) during the range windows associated with a set of 50 laser pulses of the major frame. delta_time counts Strong background counts ATL01/atlas/pcex/a_pmf_algorithm_science referenceInformation ATLAS flight s/w indicates for the beam the # of counted time tags (BackgroundCounts_50Shot) during the range windows associated with a set of 50 laser pulses of the major frame. delta_time PCE Major frame counter counts Derived referenceInformation Major Frame ID - The major frame ID is read from the DFC and starts counting at DFC POR. The counter is used to identify individual major frames across diag and science packets. This counter can go for about 2.7 years before rolling over. It is in the first time tag science packet. Used as part of the photon ID delta_time Science Mode Flag counts ATL01/atlas/pcex/a_alt_sci/ 0 15 referenceInformation Science Mode Flag. Used by ATL03 to discard non-science mode data. 0=stby, 1=science_mode, 2=test, 3=manual, 4=radio, 5=unknown, > 10=amcs_not_normal delta_time stby science test manual radio unknown unused unused unused unused stby_alt_amcs science_alt_amcs test_alt_amcs manual_alt_amcs radio_alt_amcs unknown_alt_amcs 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 delta_time The background data is specific to each beam and reported at a 50-shot rate. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Contains parameters related to the GPS Receiver. Data within this group are stored at the data rate of the source GPS Receiver Data Packets. (nominally one per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. DS for 16 slots 1 Dimension Scale 1 16 referenceInformation Dimension scale representing each of the 16 slots. dBHz CADR Carrier to Noise Power Density Ratio ATL01/sc3/gpsr/carrier_amplitude converted referenceInformation Carrier Amplitude Data Record (CADR) - Carrier to Noise Power Density Ratio. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time Number of slots filled counts ATL01/sc3/gpsr/carrier_amplitude/dfh/raw_num_recs 0 24 referenceInformation Number of the 16 available slots filled by telemetry. Data values after the number of valid slots are filled with 0. Note: Valid data records will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 16, then the remaining unused data fields within the arrays will be zero-filled. delta_time CADR Antenna Identifier 1 ATL01/sc3/gpsr/carrier_amplitude 0 1 referenceInformation Carrier Amplitude Data Record (CADR) - Antenna Identifier. 0 = First Antenna 1 = Second Antenna (invalid for present receiver) All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time first_antenna second_antenna 0 1 ATL01/sc3/gpsr/carrier_amplitude 0 6 referenceInformation Carrier Amplitude Data Record (CADR) - GPS Signal Type. 0 = GPS L1 C/A 1 = GPS L1 P 2 = GPS L2 C/A (N/A for present receiver) 3 = GPS L2 P 4 = GPS L2 CM 5 = GPS L2 CL (N/A for present receiver) 6 = No signal processing on this channel All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time gps_l1a_ca gps_l1_p gps_l2_ca gps_l2_p gps_l2_cm gps_l2_cl no_signal_processing 0 1 2 3 4 5 6 CADR GPS Signal Type 1 CADR Constellation ID counts ATL01/sc3/gpsr/carrier_amplitude referenceInformation Carrier Amplitude Data Record (CADR) - Constellation ID - Single Frequency Channel 1-24 (0 = GPS Constellation; All other values invalid). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CADR Channel Number counts ATL01/sc3/gpsr/carrier_amplitude 0 23 referenceInformation Carrier Amplitude Data Record (CADR) - Channel Number. 0 to 23; All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CADR Carrier Amplitude dB ATL01/sc3/gpsr/carrier_amplitude converted referenceInformation Carrier Amplitude Data Record (CADR) - Carrier Amplitude - Multiple Frequency Processing. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CADR Space Vehicle ID counts ATL01/sc3/gpsr/carrier_amplitude 0 32 referenceInformation Carrier Amplitude Data Record (CADR) - Space Vehicle ID. (0 = No signal acquisition or tracking; 1-32 = GPS SVs. All other values invalid). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time delta_time ds_16_slots Contains parameters related to Carrier Amplitude Data Record (CADR). Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) 1 DS for 24 slots Dimension Scale 1 24 referenceInformation Dimension scale representing each of the 24 slots. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. CRPDR Delta Range meters/second ATL01/sc3/gpsr/carrier_phase converted referenceInformation Carrier Phase Data Record (CrPDR) - Delta Range. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time Number of slots filled counts ATL01/sc3/gpsr/carrier_phase/dfh_x/raw_num_recs 0 24 referenceInformation Number of the 24 available slots filled by telemetry. Data values after the number of valid slots are filled with 0. Note: Valid data records will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused data fields within the arrays will be zero-filled. delta_time CRPDR Antenna Identifier 1 ATL01/sc3/gpsr/carrier_phase referenceInformation Carrier Phase Data Record (CrPDR) - Antenna Identifier. 0 = First Antenna 1 = Second Antenna (invalid for present receiver) All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time first_antenna second_antenna 0 1 CRPDR Constellation ID counts ATL01/sc3/gpsr/carrier_phase referenceInformation Carrier Phase Data Record (CrPDR) - Constellation ID - Single Frequency Channel 1-24 (0 = GPS Constellation; All other values invalid). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CRPDR GPS Signal Type 1 ATL01/sc3/gpsr/carrier_phase 0 6 referenceInformation Carrier Phase Data Record (CrPDR) - GPS Signal Type. 0 = GPS L1 C/A 1 = GPS L1 P 2 = GPS L2 C/A (N/A for present receiver) 3 = GPS L2 P 4 = GPS L2 CM 5 = GPS L2 CL (N/A for present receiver) 6 = No signal processing on this channel All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time gps_l1a_ca gps_l1_p gps_l2_ca gps_l2_p gps_l2_cm gps_l2_cl no_signal_processing 0 1 2 3 4 5 6 CRPDR Deterioration Flag 1 ATL01/sc3/gpsr/carrier_phase 0 1 referenceInformation Carrier Phase Data Record (CrPDR) - Deterioration Flag. 0= Carrier Loop Lock Steady 1 = Carrier Loop Lock Unsteady (Measurement data may be deteriorated). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time steady unsteady 0 1 CRPDR Integer Carrier Cycle Counter counts ATL01/sc3/gpsr/carrier_phase referenceInformation Carrier Phase Data Record (CrPDR) - Integer Carrier Cycle Counter - Note: At the beginning of each track the integer carrier cycle count starts with 0. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time degrees CRPDR Carrier Cycle Fraction ATL01/sc3/gpsr/carrier_phase converted referenceInformation Carrier Phase Data Record (CrPDR) - Carrier Cycle Fraction - Fraction corresponding to 360 degrees divided by 4096. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CRPDR Channel Number counts ATL01/sc3/gpsr/carrier_phase 0 23 referenceInformation Carrier Phase Data Record (CrPDR) - Channel Number. 0 to 23; All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CRPDR Space Vehicle ID counts ATL01/sc3/gpsr/carrier_phase 0 32 referenceInformation Carrier Phase Data Record (CrPDR) - Space Vehicle ID. (0 = No signal acquisition or tracking; 1-32 = GPS SVs. All other values invalid). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time delta_time ds_24_slots Contains parameters related to the GPSR Carrier Phase Data Record (CrPDR). Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) DS for 24 slots 1 Dimension Scale 1 24 referenceInformation Dimension scale representing each of the 24 slots. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. CSR Code Loop Bandwidth counts ATL01/sc4/gpsr/channel_status 0 127 referenceInformation Channel Status Record (CSR) - Index of actual code loop bandwidth setting - Single Frequency Channel 1-24, Value = 0; Multiple Settings are not applicable for this parameter type. All other values invalid delta_time CSR Code Loop Correlator Spacing Final Flag 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Code Loop Correlator Spacing (CdLCS) Final Flag (FF) - Single Frequency Channel 1-24. 0 = Code loop correlator not final, 1 = Final code loop correlator applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Code Phase Deterioration 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Code Phase Deterioration (CdPD) - Single Frequency Channel 1-24. 0 = No deterioration, 1 = Measurement quality deterioration. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time no_deterioration deterioration 0 1 CSR Carrier Loop Int Time Final Flag 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Carrier Loop Int Time (CrLIT) Final Flag (FF) - Single Frequency Channel 1-24. 0 = Carrier loop integration time not final, 1 = Final carrier loop integration time applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Navigation Data Sync Status 1 ATL01/sc4/gpsr/channel_status 0 3 referenceInformation Channel Status Record (CSR) - Navigation Data Sync Status - Single Frequency Channel 1-24. 0 = Nav Data Not Synchronized, 1 = Nav Data Synchronized, Data Stream Not Inverted, 3 = Nav Data Synchronized, Data Stream Inverted. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_synced synced_not_inverted synced_inverted 0 1 3 Number of slots filled counts ATL01/sc4/gpsr/channel_status/dfh/raw_num_recs 0 24 referenceInformation Number of the 24 available slots filled by telemetry. Data values after the number of valid slots are filled with 0. Note: Valid data records will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused data fields within the arrays will be zero-filled. delta_time CSR Logical Tracking State counts ATL01/sc4/gpsr/channel_status referenceInformation Channel Status Record (CSR) - Logical Tracking State - Single Frequency Channel 1-24. See Appendix C within DN-ICESAT2-SYS-024 for enumerated values. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time CSR Carrier Loop Int Time counts ATL01/sc4/gpsr/channel_status 0 24 referenceInformation Channel Status Record (CSR) - Index of actual carrier loop integration time setting - Single Frequency Channel 1-24. Value = 0; Multiple Settings are not applicable for this parameter type. All other values invalid. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time CSR Carrier Phase Deterioration 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Carrier Phase Deterioration; 0 = No deterioration, 1 = Measurement quality deterioration. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time no_deterioration deterioration 0 1 CSR Carrier Loop Bandwidth Final Flag 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Carrier Loop Bandwidth (CrLB) Final Flag (FF) - Single Frequency Channel 1-24. 0 = Carrier loop bandwidth not final, 1 = Final carrier bandwidth time applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Antenna Identifier 1 ATL01/sc4/gpsr/channel_status referenceInformation Channel Status Record (CSR) - Antenna Identifier. 0 = First Antenna 1 = Second Antenna (invalid for present receiver) All other values invalid. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time first_antenna second_antenna 0 1 CSR Code Loop Int Time Final Flag 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Code Loop Int Time Final (CdLIT) Flag (FF) - Single Frequency Channel 1-24. 0 = Code loop integration time not final, 1 = Final code loop integration time applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Code Loop Int Time 1 ATL01/sc4/gpsr/channel_status 0 24 referenceInformation Channel Status Record (CSR) - Index of actual code loop integration time setting - Single Frequency Channel 1-24. Value = 0; Multiple Settings are not applicable for this parameter type. All other values invalid. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time CSR Code Loop Bandwidth Final Flag 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Code Loop Bandwidth (CdLB) Final Flag (FF) - Single Frequency Channel 1-24. 0 = Code loop bandwidth not final, 1 = Final code bandwidth time applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Code Loop Lock 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Code Loop Lock (CdLL) - Single Frequency Channel 1-24. 0 = Not locked, 1 = Locked. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_locked locked 0 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Carrier Loop Lock (CrLL) - Single Frequency Channel 1-24. 0 = Not locked, 1 = Locked. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_locked locked 0 1 CSR Carrier Loop Lock 1 CSR Constellation ID counts ATL01/sc4/gpsr/channel_status referenceInformation Channel Status Record (CSR) - Constellation ID - Single Frequency Channel 1-24 (0 = GPS Constellation; All other values invalid). Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time CSR Carrier Loop Bandwidth counts ATL01/sc4/gpsr/channel_status 0 24 referenceInformation Channel Status Record (CSR) - Index of actual carrier loop bandwidth setting - Single Frequency Channel 1-24 Value = 0; Multiple Settings are not applicable for this parameter type. All other values invalid. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time CSR GPS Signal Type 1 ATL01/sc4/gpsr/channel_status 0 6 referenceInformation Channel Status Record (CSR) - GPS Signal Type. 0 = GPS L1 C/A 1 = GPS L1 P 2 = GPS L2 C/A (N/A for present receiver) 3 = GPS L2 P 4 = GPS L2 CM 5 = GPS L2 CL (N/A for present receiver) 6 = No signal processing on this channel All other values invalid. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time gps_l1a_ca gps_l1_p gps_l2_ca gps_l2_p gps_l2_cm gps_l2_cl no_signal_processing 0 1 2 3 4 5 6 CSR Code Loop Mode 1 ATL01/sc4/gpsr/channel_status 0 3 referenceInformation Channel Status Record (CSR) - Code Loop Mode - Single Frequency Channel 1-24. 0 = No code loop activities, 1 = Code acquisition ongoing, 2 = Code tracking ongoing, 3 = Code acquisition error. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time no_activities acquisition tracking acq_error 0 1 2 3 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Carrier Loop Threshold (CrLT) Final Flag (FF) - Single Frequency Channel 1-24. 0 = Carrier loop threshold not final, 1 = Final carrier loop threshold applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Carrier Loop Threshold Final Flag 1 CSR Code Loop Threshold Final Flag 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Code Loop Threshold (CdLT) Final Flag (FF) - Single Frequency Channel 1-24. 0 = Code loop threshold not final, 1 = Final code loop threshold applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Channel Number counts ATL01/sc4/gpsr/channel_status 0 23 referenceInformation Channel Status Record (CSR) - Channel Number. 0 to 23; All other values invalid. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time CSR Carrier Loop Mode 1 ATL01/sc4/gpsr/channel_status 0 3 referenceInformation Channel Status Record (CSR) - Carrier Loop Mode) - Single Frequency Channel 1-24. 0 = No carrier loop activities; 1 = Carrier acquisition ongoing; 2 = Carrier tracking ongoing; 3 = Carrier acquisition error. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time no_activities acquisition tracking acq_error 0 1 2 3 CSR Carrier Loop Discriminator Final Flag 1 ATL01/sc4/gpsr/channel_status 0 1 referenceInformation Channel Status Record (CSR) - Carrier Loop Discriminator (CrLD) Final Flag (FF) - Single Frequency Channel 1-24. 0 = Carrier loop discriminator not final, 1 = Final carrier loop discriminator applied. Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time not_final applied 0 1 CSR Space Vehicle ID counts ATL01/sc4/gpsr/channel_status 0 32 referenceInformation Channel Status Record (CSR) - Space Vehicle ID. (0 = No signal acquisition or tracking; 1-32 = GPS SVs. All other values invalid). Note: num_valid_slots indicate the number of channel that actual valid to use. the remaining unused data fields are zero-filled. delta_time delta_time ds_24_slots Contains parameters related to Channel Status record (CSR). Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) DS for 24 slots 1 Dimension Scale 1 24 referenceInformation Dimension scale representing each of the 24 slots. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Number of slots filled counts ATL01/sc3/gpsr/code_phase/dfh_x/raw_num_recs 0 24 referenceInformation Number of the 24 available slots filled by telemetry. Data values after the number of valid slots are filled with 0. Note: Valid data records will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused data fields within the arrays will be zero-filled. delta_time CDPDR Chip Count counts ATL01/sc3/gpsr/code_phase referenceInformation Code Phase Data Record (CdPDR) - Number of Code Chips Since Start of GPS Week. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CDPDR Antenna Identifier 1 ATL01/sc3/gpsr/code_phase 0 1 referenceInformation Code Phase Data Record (CdPDR) - Antenna Identifier. 0 = First Antenna 1 = Second Antenna (invalid for present receiver) All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time first_antenna second_antenna 0 1 CDPDR Smoothing Flag 1 ATL01/sc3/gpsr/code_phase 0 1 referenceInformation Code Phase Data Record (CdPDR) - Smoothing Flag. 0 = Smoothing Not Applied 1 = Carrier phase-based smoothing applied for the reported code phase. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time not_applied applied 0 1 CDPDR Fractional Chip Count counts ATL01/sc3/gpsr/code_phase converted referenceInformation Code Phase Data Record (CdPDR) - Fractional Portion of Number of Code Chips Since Start of GPS Week. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CDPDR Constellation ID counts ATL01/sc3/gpsr/code_phase referenceInformation Code Phase Data Record (CdPDR) - Constellation ID - Single Frequency Channel 1-24 (0 = GPS Constellation; All other values invalid). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CDPDR GPS Signal Type 1 ATL01/sc3/gpsr/code_phase 0 6 referenceInformation Code Phase Data Record (CdPDR) - GPS Signal Type. 0 = GPS L1 C/A 1 = GPS L1 P 2 = GPS L2 C/A (N/A for present receiver) 3 = GPS L2 P 4 = GPS L2 CM 5 = GPS L2 CL (N/A for present receiver) 6 = No signal processing on this channel All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time gps_l1a_ca gps_l1_p gps_l2_ca gps_l2_p gps_l2_cm gps_l2_cl no_signal_processing 0 1 2 3 4 5 6 CDPDR Deterioration Flag 1 ATL01/sc3/gpsr/code_phase 0 1 referenceInformation Code Phase Data Record (CdPDR) - Deterioration Flag. 0= Carrier Loop Lock Steady 1 = Carrier Loop Lock Unsteady (Measurement data may be deteriorated). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time steady unsteady 0 1 CDPDR Channel Number counts ATL01/sc3/gpsr/code_phase 0 23 referenceInformation Code Phase Data Record (CdPDR) - Channel Number. 0 to 23; All other values invalid. Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time CDPDR Space Vehicle ID counts ATL01/sc3/gpsr/code_phase 0 32 referenceInformation Code Phase Data Record (CdPDR) - Space Vehicle ID. (0 = No signal acquisition or tracking; 1-32 = GPS SVs. All other values invalid). Note: Valid data records (num_valid_slots) will only be included for the amount of SFCs being tracked by the GPSR. If the tracked SFCs < 24, then the remaining unused CSR data fields within the ancillary packet will be zero-filled. delta_time delta_time ds_24_slots Contains parameters related to Code Phase Data Record (CdPDR). Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) NAV Longitude (WGS84) degrees_east ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Longitude (WGS84) delta_time NAV Latitude (WGS84) degrees_north ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Latitude (WGS84) delta_time Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. GPSR Time Dilution of Precision meters ATL01/sc4/gpsr/navigation converted referenceInformation GPSR - Time Dilution of Precision. Values greater than 655.34 are saturated to 655.34; Value set to 655.35 when NSM = 1 or in the case NSM = 5 with fewer than 4 SVs available. delta_time latitude longitude NAV Vertical Speed meters/second ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Vertical Speed delta_time latitude longitude GPSR Navigation Solution Method (NSM) 1 ATL01/sc4/gpsr/navigation 1 7 referenceInformation GPSR - Navigation Solution Method. 1 = Propagated 2 = Cold Start - First Nav Fix 3 = Cold Start - Least Squares Method w/ no GDOP Optimization 4 = Least Squares Method w/ all Visible SVs 5 = Kalman Filter Method (Normal Operation) 7 = Invalid Navigation Solution All other values invalid delta_time latitude longitude propagated cold_lsq_no_gdop lsqm_w_svs normal_lsqm normal_kalman unused invalid_solution 1 2 3 4 5 6 7 NAV Velocity Error X meters/second ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated X velocity error delta_time latitude longitude NAV Maximum User Range Accuracy (URA) counts ATL01/sc4/gpsr/navigation -16 15 referenceInformation Navigation Solution Data Record (NAV) - Maximum User Range Accuracy (-16 means that no URA is available) delta_time latitude longitude NAV Position Dilution of Precision counts ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Position Dilution of Precision. Values greater than 655.34 are saturated to 655.34; Value set to 655.35 when NSM = 1 or in the case NSM = 5 with fewer than 4 SVs available. delta_time latitude longitude TCDR GPS Time (Subseconds) 1/4294967296 seconds ATL01/sc4/gpsr/navigation referenceInformation Time Correlation Data Record (TCDR) - Subseconds portion of the GPS Time (GPST) representation of the synchronization time stamp. Total seconds elapsed since GPS epoch (6-Jan-1980 00:00:00) starting with 0. (Same data that is provided to ATLAS in RT) delta_time latitude longitude NAV Number of SVs in Solution counts ATL01/sc4/gpsr/navigation 0 8 referenceInformation Navigation Solution Data Record (NAV) - The number of SVs the receiver was able to use for the Navigation Solution computation, i.e. SVs for which code and carrier phase measurements and Ephemeris data were available delta_time latitude longitude NAV Velocity Error Z meters/second ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Z velocity error delta_time latitude longitude NAV Maximum Curve Fit 1 ATL01/sc4/gpsr/navigation 0 15 referenceInformation Navigation Solution Data Record (NAV) - Maximum Curve Fit interval taken from all SVs used in current navigation solution delta_time latitude longitude 4h 6h 8h 14h 26h 50h 74h 98h 122h 146h no_curve_fit 0 1 2 3 4 5 6 7 8 9 15 NAV Position Y (WGS84) meters ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Y position of the platform reference point according to the Navigation Solution Method (NSM) at the point in time of GPST (WGS84) delta_time latitude longitude NAV Position Error Y meters ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Y position error delta_time latitude longitude NAV Velocity Y (WGS84) meters/second ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Y velocity of the platform reference point according to the Navigation Solution Method (NSM) at the point in time of GPST (WGS84) delta_time latitude longitude NAV Position X (WGS84) meters ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated X position of the platform reference point according to the Navigation Solution Method (NSM) at the point in time of GPST (WGS84) delta_time latitude longitude TCDR GPS Time (Seconds) seconds ATL01/sc4/gpsr/navigation referenceInformation Time Correlation Data Record (TCDR) - GPS Time (GPST) representation of the synchronization time stamp. Total seconds elapsed since GPS epoch (6-Jan-1980 00:00:00) starting with 0. (Same data that is provided to ATLAS in RT) delta_time latitude longitude NAV Position Z (WGS84) meters ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Z position of the platform reference point according to the Navigation Solution Method (NSM) at the point in time of GPST (WGS84) delta_time latitude longitude NAV Velocity X (WGS84) meters/second ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated X velocity of the platform reference point according to the Navigation Solution Method (NSM) at the point in time of GPST (WGS84) delta_time latitude longitude NAV Geometric Dilution of Precision meters ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Geometric Dilution of Precision (Values greater than 655.34 m are saturated to 655.34 m.) delta_time latitude longitude NAV Receiver Clock Frequency Error seconds ATL01/sc4/gpsr/navigation referenceInformation Navigation Solution Data Record (NAV) - Receiver Clock Frequency Error delta_time NAV GNSS System Time Error seconds ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - GNSS System Time Error delta_time latitude longitude NAV Velocity Error Y meters/second ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Y velocity error delta_time latitude longitude NAV Position Error X meters ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated X position error delta_time latitude longitude NAV Time Quality Index seconds ATL01/sc4/gpsr/navigation 0 4095 referenceInformation Navigation Solution Data Record (NAV) - Time Quality Index; Values greater than 4095 ns are saturated to 4095 ns. delta_time latitude longitude NAV Velocity Z (WGS84) meters/second ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Z velocity of the platform reference point according to the Navigation Solution Method (NSM) at the point in time of GPST (WGS84) delta_time latitude longitude meters NAV Height Above Reference Ellipsoid (WGS84) ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Height Above Reference Ellipsoid (WGS84) delta_time latitude longitude NAV Position Error Z meters ATL01/sc4/gpsr/navigation converted referenceInformation Navigation Solution Data Record (NAV) - Estimated Z position error delta_time latitude longitude delta_time Contains parameters related to navigation solution. Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) DS for each chain 1 Dimension Scale 1 2 referenceInformation Dimension scale representing each of the 2 chains. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. NHDR Chain Index - Chain 1-2 1 ATL01/sc3/gpsr/noise_histogram 0 1 referenceInformation Noise Histogram Data Record (NHDR) - Chain Index - Down Conversion Chain Identifier 1-2 delta_time antenna1_l1carrier antenna1_l2carrier 0 1 NHDR Normalized Negative Quadrature-Phase Counts M1 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the negative Quadrature-phase samples (M1) - Down Conversion Chain Identifier 1-2 delta_time NHDR Normalized Positive Quadrature-Phase Counts P3 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the positive Quadrature-phase samples (P3) - Down Conversion Chain Identifier 1-2 delta_time NHDR Normalized Positive Quadrature-Phase Counts P1 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the positive Quadrature-phase samples (P1) - Down Conversion Chain Identifier 1-2 delta_time NHDR Noise Power - Chain 1-2 dB ATL01/sc3/gpsr/noise_histogram converted referenceInformation Noise Histogram Data Record (NHDR) - Noise Power as seen at the input of the variable gain IF amplifier - Down Conversion Chain Identifier 1-2 delta_time NHDR Normalized Positive In-Phase Counts P3 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the positive In-phase samples (P3) - Down Conversion Chain Identifier 1-2 delta_time NHDR Normalized Positive In-Phase Counts P1 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the positive In-phase samples (P1) - Down Conversion Chain Identifier 1-2 delta_time NHDR Normalized Negative Quadrature-Phase Counts M3 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the negative Quadrature-phase samples (M3) - Down Conversion Chain Identifier 1-2 delta_time NHDR Normalized Negative In-Phase Counts M3 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the negative In-phase samples (M3) - Down Conversion Chain Identifier 1-2 delta_time NHDR Normalized Negative In-Phase Counts M1 - Chain 1-2 counts ATL01/sc3/gpsr/noise_histogram referenceInformation Noise Histogram Data Record (NHDR) - Normalized signal level detector counts of the negative In-phase samples (M1) - Down Conversion Chain Identifier 1-2 delta_time delta_time ds_chain Contains parameters related to the GPS Noise Histogram Data Record (NHDR). Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. HK Instr Cache Tag Error Counter counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Instr Cache Tag Error Counter delta_time counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - MilBus I/F EDAC Single Bit Error delta_time HK MilBus I/F EDAC Single Bit Error HK Data Cache Data Error Counter counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Data Cache Data Error Counter delta_time HK Corrected Register File Errors 1 ATL01/sc4/gpsr/hk 0 1 referenceInformation Housekeeping Parameter Report (HK) - Corrected Register File Errors delta_time no_error_detected error_detected 0 1 HK CPU Processor Load counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - CPU Load of most recent PPS interval delta_time GPSR Navigation Solution Method (NSM) 1 ATL01/sc4/gpsr/hk 0 7 referenceInformation GPSR - Navigation Solution Method. 1 = Propagated; 2 = Cold Start - First Nav Fix; 3 = Cold Start - Least Squares Method w/ no GDOP Optimization; 4 = Least Squares Method w/ all Visible SVs; 5 = Kalman Filter Method (Normal Operation); 7 = Invalid Navigation Solution. All other values are invalid. delta_time unknown propagated cold_first_nav cold_lsq_no_gdop lsqm_w_svs normal_kalman invalid_solution 0 1 2 3 4 5 7 counts HK MilBus I/F EDAC Double Bit Error ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - MilBus I/F EDAC Double Bit Error delta_time HK SRAM EDAC Status 1 ATL01/sc4/gpsr/hk 0 1 referenceInformation Housekeeping Parameter Report (HK) - SRAM EDAC Single bit error delta_time no_error_detected error_detected 0 1 counts HK Discarded TM Packet Counter ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Number of TM packets discarded since start of GPSR (wrapping counter). delta_time HK Number of SVs Being Acquired counts ATL01/sc4/gpsr/hk 0 8 referenceInformation Housekeeping Parameter Report (HK) - GNSS satellites being acquired at the most recent PPS, i.e. channels with Multi-Frequency Tracking state 2...4 delta_time HK MilBus Protocol Selection Flag counts ATL01/sc4/gpsr/hk 0 1 referenceInformation Housekeeping Parameter Report (HK) - MilBus Protocol Selection Flag delta_time HK MilBus Transient Protocol Error Count counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - MilBus Transient Protocol Error Count delta_time counts HK Data Cache Tag Error Counter ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Data Cache Tag Error Counter delta_time HK Clock Source 1 ATL01/sc4/gpsr/hk 0 1 referenceInformation Housekeeping Parameter Report (HK) - Clock Source delta_time internal_clock value_invalid 0 1 HK PROM EDAC Status counts ATL01/sc4/gpsr/hk 0 1 referenceInformation Housekeeping Parameter Report (HK) - PROM EDAC Single bit or uncorrectable error delta_time no_error_detected error_detected 0 1 DFH Front End Temperature counts GPSR_DFH physicalMeasurement GPSR Data Field Header - R/F Front End Temperature (raw counts; not EU-converted) delta_time HK Number of SVs Used for PVT counts ATL01/sc4/gpsr/hk 0 8 referenceInformation Housekeeping Parameter Report (HK) - GNSS satellites being used for PVT at the PPS before the most recent PPS delta_time HK Number of Tracked SVs w/o All Components in Tracking State counts ATL01/sc4/gpsr/hk 0 8 referenceInformation Housekeeping Parameter Report (HK) - GNSS satellites being tracked with not all signal components in a final tracking state at the most recent PPS, i.e. channels with Multi-Frequency Tracking state 5...10 (L1 C/A & P(Y)) or Multi-Frequency Tracking state 5...7 (L1 C/A & L2 CM) delta_time HK Transmit Buffer Occupancy counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Number of bytes buffered for transmission delta_time HK Number of Tracked SVs w All Components in Tracking State counts ATL01/sc4/gpsr/hk 0 8 referenceInformation Housekeeping Parameter Report (HK) - GNSS satellites being tracked with all signal components in final tracking state at the most recent PPS delta_time counts HK Discarded TC Packet Counter ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Number of TC packets discarded since start of GPSR (wrapping counter). delta_time HK Instr Cache Data Error Counter counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Instr Cache Data Error Counter delta_time HK Memory Dump Status counts ATL01/sc4/gpsr/hk referenceInformation Housekeeping Parameter Report (HK) - Number of TM packets to be generated until the current Memory Dump is finished delta_time delta_time Contains parameters related to GPSR housekeeping. Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time, in seconds since the ATLAS SDP GPS Epoch, computed from raw_gps_time_sec and subseconds in the time correlation group. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. TCDR TCDR UTC Time - Microseconds usec ATL01/sc4/gpsr/time_correlation referenceInformation Time Correlation Data Record (TCDR) - UTC time representation of the synchronization time stamp. Number of microseconds of current day. delta_time GPSR Time Dilution of Precision meters ATL01/sc4/gpsr/time_correlation converted referenceInformation GPSR - Time Dilution of Precision. Values greater than 655.34 are saturated to 655.34; Value set to 655.35 when NSM = 1 or in the case NSM = 5 with fewer than 4 SVs available. delta_time GPSR Navigation Solution Method (NSM) 1 ATL01/sc4/gpsr/time_correlation 1 7 referenceInformation GPSR - Navigation Solution Method. 1 = Propagated 2 = Cold Start - First Nav Fix 3 = Cold Start - Least Squares Method w/ no GDOP Optimization 4 = Least Squares Method w/ all Visible SVs 5 = Kalman Filter Method (Normal Operation) 7 = Invalid Navigation Solution All other values invalid delta_time propagated cold_lsq_no_gdop lsqm_w_svs normal_lsqm normal_kalman unused invalid_solution 1 2 3 4 5 6 7 TCDR Instrument Measurement Time counts ATL01/sc4/gpsr/time_correlation referenceInformation Time Correlation Data Record (TCDR) - Time Correlation Data Record (TCDR) - Instrument Measurement Time (IMT) representation of the synchronization time stamp. IMT precisely describes how the GPSR clock oscillator behaves, and is for internal and maintenance use only. This field contains the raw 64-bit IMT value. (Be aware of possible precision loss possible when converting to seconds.) delta_time TCDR GPS Time (Seconds) seconds ATL01/sc4/gpsr/time_correlation referenceInformation Time Correlation Data Record (TCDR) - GPS Time (GPST) representation of the synchronization time stamp. Total seconds elapsed since GPS epoch (6-Jan-1980 00:00:00) starting with 0. (Same data that is provided to ATLAS in RT) delta_time TCDR Time Quality Index nanoseconds ATL01/sc4/gpsr/time_correlation 0 4095 referenceInformation Time Correlation Data Record (TCDR) - Time Quality Index. Nanoseconds; Values greater than 4095 ns are saturated to 4095 ns. delta_time TCDR GPS Time (Subseconds) 1/4294967296 seconds ATL01/sc4/gpsr/time_correlation referenceInformation Time Correlation Data Record (TCDR) - Subseconds portion of the GPS Time (GPST) representation of the synchronization time stamp. Total seconds elapsed since GPS epoch (6-Jan-1980 00:00:00) starting with 0. (Same data that is provided to ATLAS in RT) delta_time days TCDR TCDR UTC Time - Days ATL01/sc4/gpsr/time_correlation referenceInformation Time Correlation Data Record (TCDR) - UTC time representation of the synchronization time stamp. Number of days since 1st January 2000, 00:00:00 starting with 0. delta_time msec ATL01/sc4/gpsr/time_correlation referenceInformation Time Correlation Data Record (TCDR) - UTC time representation of the synchronization time stamp. Number of milliseconds of current day. delta_time TCDR TCDR UTC Time - Milliseconds delta_time Contains parameters related to GPSR time correlation data record (TCDR). Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) Group contains the Laser Reference System (LRS) packet decommutated data Data within this group are stored at the nominal rate of the corresponding LRS APIDs (varies per APID). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time values retrieved from the CCSDS header timestamps, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. counts LRS_LCENT centroid magitude LRS_LCENT referenceInformation The 12-bit centroid magnitude. The centroids are the Transmit Laser Centroids and TAMS Centroids. delta_time 1 LRS_LCENT Centroid quality LRS_LCENT 0 1 referenceInformation Flag indicates centroids pass basic validity checks in the LRS software. 0 = valid centroids; 1 = the corresponding centroid is considered questionable (that is, the corresponding centroid should not be expected to report a valid target with full accuracy). The win parameter within this group correlates the flags to tams/laser windows. However, the correlation of the windows to the actual tams/laser spots is not guaranteed. delta_time valid questionable 0 1 LRS_LCENT centroid H pixels LRS_LCENT referenceInformation The centroid H value. The centroids are the Transmit Laser Centroids and TAMS Centroids. delta_time counts Center of integration base LRS referenceInformation Base age of centroids relative to secondary header timestamp. This 32-bit value indicates how many 843.75 kHz time ticks of offset should be applied between the secondary header timestamp and the center_of_integration for the laser centroids reported. This time offset assumes that the secondary header timestamp represents an exact milli-second (that is, is accurate beyond the precision expressed in the timestamp). The offset is based on the LRS internal 27 MHz oscillator (divided by 32), and it can express offset from zero to more than 84 minutes with about 1.185 micro second resolution. Under normal operating conditions, the offset should never exceed 20 milli seconds (about 16875 counts). Centroid timetags offset with this value alone should be adequate for coarse geo-location, but not precision geo-location knowledge as expected for science (individual centroid offsets are required for that purpose). delta_time 1 LRS_LCENT Tracking status LRS_LCENT 0 1 referenceInformation Flag indicates tracking status for centroid; 1 = valid tracking of that centroid window; 0 = the corresponding window is in a searching or acquiring state (that is, the corresponding centroid should not be considered to report a valid target). The win parameter within this group correlates the flags to tams/laser windows. However, the correlation of the windows to the actual tams/laser spots is not guaranteed. delta_time acq_state track_state 0 1 Window 1 LRS_LCENT 0 10 referenceInformation Indicates the window corresponding to each component of the centmagtime and corresponding flags. Values of 1-4 correspond to TAMS windows; values of 5-10 correspond to laser windows. Assignment of a window to a particular spot is not guaranteed. delta_time none tams0 tams1 tams2 tams3 laser1 laser2 laser3 laser4 laser5 laser6 0 1 2 3 4 5 6 7 8 9 10 LRS_LCENT centroid V pixels LRS_LCENT referenceInformation The centroid V value. The centroids are the Transmit Laser Centroids and TAMS Centroids. delta_time counts Center of integration offset LRS referenceInformation The signed 16-bit center of integration offset for this specific centroid. delta_time delta_time Contains parameters relating to the Application Laser Centroid (LCENT) Data. The (Application Mode) Laser Centroid Data Packet contains reported Laser-Side Centroids, which are part of the core LRS data output. This packet normally will contain 10 valid centroids, reported and stored at a nominally 50 Hz rate and is available through all data channels (SSR, real time telemetry, and onboard to the spacecraft ACS). Data within this group are stored at the data rate of the source LRS Application Laser Centroid Data (nominally fifty per second). Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Retrieved times from the CCSDS header timestamps, in seconds relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Center of integration offset counts LRS referenceInformation The signed 16-bit center of integration offset for this specific centroid. delta_time LRS_LCENT centroid magitude counts LRS_LCENT referenceInformation The 12-bit centroid magnitude. From Word 2, bits 15 (MSB) to 4 delta_time Center of integration base counts LRS referenceInformation Base age of centroids relative to secondary header timestamp. This 32-bit value indicates how many 843.75 kHz time ticks of offset should be applied between the secondary header timestamp and the center_of_integration for the laser centroids reported. This time offset assumes that the secondary header timestamp represents an exact milli-second (that is, is accurate beyond the precision expressed in the timestamp). The offset is based on the LRS internal 27 MHz oscillator (divided by 32), and it can express offset from zero to more than 84 minutes with about 1.185 micro second resolution. Under normal operating conditions, the offset should never exceed 20 milli seconds (about 16875 counts). Centroid timetags offset with this value alone should be adequate for coarse geo-location, but not precision geo-location knowledge as expected for science (individual centroid offsets are required for that purpose). delta_time LRS_LCENT centroid H pixels LRS_LCENT referenceInformation The centroid H value. delta_time LRS_LCENT Centroid quality 1 LRS_LCENT 0 1 referenceInformation Flag indicates centroids pass basic validity checks in the LRS software. 0 indicate valid centroids; 1 indicate the corresponding centroid is considered questionable (that is, the corresponding centroid should not be expected to report a valid target with full accuracy). delta_time valid questionable 0 1 LRS_LCENT centroid V pixels LRS_LCENT referenceInformation The centroid V value. delta_time 1 LRS_LCENT Tracking status LRS_LCENT 0 1 referenceInformation Flag indicates tracking status for centroid. 1 indicate valid tracking of that centroid window; 0 indicate the corresponding window is in a searching or acquiring state (that is, the corresponding centroid should not be considered to report a valid target). delta_time acq_state track_state 0 1 delta_time The (Application Mode) Stellar Centroid Data Packet contains reported Stellar-Side Centroids, which are part of the core LRS data output. This packet is normally reported and stored at a nominally 10 Hz rate with a variable number of stars reported and is available through all data channels (SSR, real time telemetry, and onboard to the spacecraft ACS). Data within this group are stored at the data rate of the source LRS Stellar Centroid Data Packet. (nominally 10 per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. latitude longitude LRS_HK Stellar Pattern Rate Y pixels/second LRS_HK referenceInformation Y component (tip/tilt) of the stellar rate pattern estimate delta_time LRS_HK Processor Card Thermistor degreesC LRS_HK referenceInformation Temperature of Processor Card - 0x0000 = 0.000 V (nominal short;) 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Spacewire tlm packets dropped due to link not available counts LRS_HK referenceInformation This 32-bit counter is incremented every time a spacewire telemetry packet is dropped by Failsafe Mode while waiting for a valid spacewire link between the LRS and MEB (an abnormal condition). It starts at 0x00000000, and rolls over to 0x00000000 when it increments from 0xFFFFFFFF. This counter will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK System Status Register - Analog Converter Status 1 LRS_HK 0 1 referenceInformation The current status of the LRS FPGA Analog Converter. (0 =DISABLED (abnormal condition); 1 = ENABLED (normal operating condition)) delta_time disabled enabled 0 1 LRS_HK Valid Time Sync Command Counter counts LRS_HK referenceInformation The Valid Time Sync Command Counter is a 16-bit counter that increments each time that the Failsafe Mode processes a valid command of the corresponding command type. A valid command is defined as a command that passes all verification tests. The counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. The counter is reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK -12VDC LDC Monitor volts LRS_HK referenceInformation Voltage of -12VDC LDC Monitor - 0x0000 = 0.000 V; 0xBF9D = -12.000 V (nominal value); 0xFFFF = -16.000 V : A_LRS_HK.ANALOGHK[11] delta_time LRS_HK Time Sync Command Error Counter counts LRS_HK referenceInformation The 16-bit Time Sync Command error Counter is incremented every time the Failsafe Mode has one or more command verification or processing errors with the corresponding command type (abnormal conditions). The counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. The counter increments only once per command when there is at least one verification/processing error for that command. TIMEERRCODE will indicate the type of error. The counter is reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK +5VDC SDC Monitor volts LRS_HK referenceInformation Voltage of +5VDC SDC Monitor - 0x0000 = 0.000 V; 0xA000 = +5.000 V (nominal value); 0xFFFF = +8.000 V : A_LRS_HK.ANALOGHK[13] delta_time LRS_HK Unique Code for User Command Errors counts LRS_HK referenceInformation The 16-bit Command Error Unique Code indicates the last type of command error that occurred in Failsafe Mode. This code will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). The error codes are defined in Table 19: Command Validation Error Codes in the LRS command and data ICD. delta_time 1 LRS_HK Checksum Status Register - EEPROM Stellar Detector Dark Frame Checksum LRS_HK 0 1 referenceInformation EEPROM Stellar Detector (SD) Dark Frame data checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK System Status Register - Spacewire Module Status 1 LRS_HK 0 1 referenceInformation The current status of the Spacewire Module (0 = NOT RUNNING (abnormal condition); 1 = RUNNING (normal operating condition)) delta_time not_running running 0 1 LRS_HK Spacewire Status Register - Last Link Error 1 LRS_HK 0 3 referenceInformation This is the Last Link Error Code portion of the LRS spacewire interface register. delta_time disconnected parity_err esc_rec credit_err 0 1 2 3 LRS_HK +3.3VDC Current Monitor amps LRS_HK referenceInformation Amperage of +3.3VDC Current Monitor - 0x0000 = 0.000 A; 0xFFFF = +4.000 A : A_LRS_HK.ANALOGHK[9] delta_time LRS_HK Spacewire Status Register _ Packet Error Counter counts LRS_HK referenceInformation This is the 6-bit Packet Error Counter portion of the LRS spacewire interface status register delta_time LRS_HK +5VDC Analog Monitor volts LRS_HK referenceInformation Voltage of +5VDC Analog Monitor - 0x0000 = 0.000 V; 0xA000 = +5.000 V (nominal value); 0xFFFF = +8.000 V : A_LRS_HK.ANALOGHK[16] delta_time LRS_HK Time Sync Command Error Code counts LRS_HK referenceInformation The 16-bit Time Sync Error Code indicates the last type of time sync error that occurred in Failsafe Mode. This code will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). The error codes are defined in Table 19: Command Validation Error Codes. delta_time 1 LRS_HK Checksum Status Register - SRAM Stellar Detector Dark Frame Checksum LRS_HK 0 1 referenceInformation SRAM Stellar Detector (SD) Dark Frame data checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK -12VDC Current Monitor amps LRS_HK referenceInformation Amperage of -12VDC Current Monitor - 0x0000 = 0.000 A; 0xFFFF = +0.400 A : A_LRS_HK.ANALOGHK[6] delta_time LRS_HK +1.5VDC Monitor volts LRS_HK referenceInformation Voltage of +1.5VDC Monitor - 0x0000 = 0.000 V; 0x6000 = +1.500 V (nominal value); 0xFFFF = +4.000 V : A_LRS_HK.ANALOGHK[3] delta_time LRS_HK Optics Thermistor #4 (Metering Bars #1 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #4 (Metering Bars #1) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Oscillator Offset Ticks counts LRS_HK referenceInformation Oscillator Offset (ticks) for TOD (time of day) correction. delta_time LRS_HK +12VDC Analog Monitor volts LRS_HK referenceInformation Voltage of +12VDC Analog Monitor - 0x0000 = 0.000 V; 0xC000 = +12.000 V (nominal value); 0xFFFF = +16.000 V : A_LRS_HK.ANALOGHK[15] delta_time LRS_HK Ground 2 Voltage volts LRS_HK referenceInformation Voltage of Ground 2 - 0x0000 = 0.000 V (nominal value); 0xFFFF = +4.000 V : A_LRS_HK.ANALOGHK[1] delta_time LRS_HK Thermistor Reference (open) volts LRS_HK referenceInformation Voltage of Thermistor Reference (open) - 0x0000 = 0.000 V; 0xFFFF = +4.000 V (nominal value) : A_LRS_HK.ANALOGHK[21] delta_time LRS_HK Thermistor Reference (ground) volts LRS_HK referenceInformation Voltage of Thermistor Reference (ground) - 0x0000 = 0.000 V (nominal value); 0xFFFF = +4.000 V : A_LRS_HK.ANALOGHK[20] delta_time LRS_HK System Status Register - SDC Digital Cable Status 1 LRS_HK 0 1 referenceInformation The current status of the LRS FPGA SDCD (Stellar Detector Card Digital Cable. (0 = DISCONNECTED (abnormal condition); 1 = CONNECTED (normal operating condition)) delta_time disconnected connected 0 1 LRS_HK Optics Thermistor #8 (Stellar Side Barrel #2 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #8 (Stellar Side Barrel #2) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK System Status Register - Laser Sync validity Status 1 LRS_HK 0 1 referenceInformation The current validity of the Laser Sync (0 = INVALID (abnormal condition); 1 = VALID (normal operating condition)) delta_time invalid valid 0 1 LRS_HK System Status Register - LDC Status 1 LRS_HK 0 1 referenceInformation The current status of the Laser Detector Card (LDC) working (0 = Finished Execution; 1 = Executing). Note: The FPGA toggles these values based on what logic is executing, so they may show up as 0 or 1 based on when the packet is generated delta_time finished executing 0 1 LRS_HK Checksum Status Register - EEPROM Application Text Checksum 1 LRS_HK 0 1 referenceInformation EEPROM Application Text (AT) checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK System Status Register - LDC Digital Cable Status 1 LRS_HK 0 1 referenceInformation The current status of the LRS FPGA LDCD (Laser Detector Card Digital Cable. (0 = DISCONNECTED (abnormal condition); 1 = CONNECTED (normal operating condition)) delta_time disconnected connected 0 1 LRS_HK Checksum Status Register - EEPROM Application Text Checksum 1 LRS_HK 0 1 referenceInformation EEPROM Application Data (AD) checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK LD Memory Conflicts counts LRS_HK referenceInformation This 16-bit counter is incremented each time the Application Mode is still accessing Laser-Side shared memory when a new LRS cycle starts. This conflict is an error, which indicates that shared memory access did not complete in the allocated time and may have caused stale or invalid laser centroids. This counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. This counter will be reset at Application Mode initialization and by an Application Reset Counters Command (LRScmRSTCNT). delta_time LRS_HK System Status Register - Jumper 1 1 LRS_HK 0 1 referenceInformation Jumper 1 status (no planned use on ATLAS). 0 = Jumper is DISCONNECTED (normal operating condition delta_time disconnected connected 0 1 LRS_HK Spacewire tlm packets dropped due to buffer not being empty counts LRS_HK referenceInformation This 32-bit counter is incremented every time a spacewire telemetry packet is dropped by Failsafe Mode while waiting for the transmission buffer to empty (an abnormal condition). It starts at 0x00000000, and rolls over to 0x00000000 when it increments from 0xFFFFFFFF. This counter will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK -12VDC Supply Monitor volts LRS_HK referenceInformation Voltage of 112VDC Supply Monitor - 0x0000 = 0.000 V; 0xBF9D = -12.000 V (nominal value); 0xFFFF = -16.000 V : A_LRS_HK.ANALOGHK[14] delta_time LRS_HK Stellar Pattern Rate X pixels/sec LRS_HK referenceInformation X component (tip/tilt) of the stellar rate pattern estimate. delta_time LRS_HK User Command Error Counter counts LRS_HK referenceInformation The 16-bit User Command Error Counter is incremented every time the Failsafe Mode has one or more command verification or processing errors with the corresponding command type (abnormal conditions). The counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. The counter increments only once per command when there is at least one verification/processing error for that command. CMDERRCODE will indicate the type of error. The counter is reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time 1 LRS_HK Checksum Status Register - EEPROM Laser Detector Dark Frame Checksum LRS_HK 0 1 referenceInformation EEPROM Laser Detector (LD) Dark Frame data checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK Remaining number of dump packets to go counts LRS_HK referenceInformation This 16-bit counter indicates the remaining number of dump packets to send during Failsafe Mode processing of a Failsafe Dump Memory Command (LRSfscmDPMEM). It is 0x0000 whenever no dump command is active. delta_time LRS_HK -12VDC SDC Monitor volts LRS_HK referenceInformation Voltage of -12VDC SDC Monitor - 0x0000 = 0.000 V; 0xBF9D = -12.000 V (nominal value); 0xFFFF = -16.000 V : A_LRS_HK.ANALOGHK[10] delta_time LRS_HK 1PPS sync counter counts LRS_HK referenceInformation A 32-bit count of sync pulses registered by the LRS FPGA. The value of the pulse counter starts at 0x00000000, and rolls over to 0x00000000 when it increments from 0xFFFFFFFF. delta_time LRS_HK System Status Register - Jumper 2 1 LRS_HK 0 1 referenceInformation Jumper 2 status (no planned use on ATLAS). 0 = Jumper is DISCONNECTED (normal operating condition) delta_time disconnected connected 0 1 counts LRS_HK LRS_HK Valid User Command Counter referenceInformation The Valid User Command Counter is a 16-bit counter that increments each time that the Failsafe Mode processes a valid command of the corresponding command type. A valid command is defined as a command that passes all verification tests. The counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. The counter is reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK Latched oscillator value at 1PPS sync counts LRS_HK referenceInformation The 32-bit count of internal 27 MHz oscillator ticks at the time when the last 1 PPS sync pulse was registered by the LRS FPGA. delta_time LRS_HK Optics Thermistor #1 (Laser Side Barrel #1 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #1 (Laser Side Barrel #1) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Spacewire words skipped to find sync counts LRS_HK referenceInformation This 32-bit counter is incremented each time a spacewire command word is skipped by Failsafe Mode to reach a valid packet sync (an abnormal condition). It starts at 0x00000000, and rolls over to 0x00000000 when it increments from 0xFFFFFFFF. This counter will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK Ground 1 Voltage volts LRS_HK referenceInformation Voltage of Ground 1 - 0x0000 = 0.000 V (nominal value); 0xFFFF = +4.000 V : A_LRS_HK.ANALOGHK[0] delta_time LRS_HK LD Processing Overruns counts LRS_HK referenceInformation This 16-bit counter is incremented each time the Application Mode is still processing Laser-Side data when a new LRS cycle starts. This overrun condition is a warning, which indicates that some processor activity did not complete in the allocated time and may delay reporting of the next laser data packets. This counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. This counter will be reset at Application Mode initialization and by an Application Reset Counters Command (LRScmRSTCNT). delta_time LRS_HK LD background counts LRS_HK referenceInformation The 16-bit values are measures of the measured detector background for the laser side after subtracting the predicted dark frame. Each is a scaled average of the background levels from all tracking windows on that detector, for all measurements in the preceding one (1) second. Because the search and imaging windows move around, these values should be expected to fluctuate significantly; however, they are an indication of how well the predicted dark frame matches the background (stray light) levels. If they are occasionally very large, there is probably a stray light problem. If they are consistently very large, there is probably error in the dark frame calibration. delta_time LRS_HK Number of memory words loaded counts LRS_HK referenceInformation This 32-bit counter records the total number of memory words loaded during Failsafe Mode processing of Failsafe Load Memory Command (LRSfscmLDMEM). It starts at 0x00000000, and rolls over to 0x00000000 when it increments from 0xFFFFFFFF. This counter will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT) delta_time 1 LRS_HK Checksum Status Register -SRAM Application Text Checksum LRS_HK 0 1 referenceInformation SRAM Application Text (AT) checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK SD Processing Overruns counts LRS_HK referenceInformation This 16-bit counter is incremented each time the Application Mode is still processing Stellar-Side data when a new LRS cycle starts that should include new Stellar-Side data collection. This overrun condition is a warning, which indicates that some processor activity did not complete in the allocated time and may delay reporting of the next stellar data packets. This counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. This counter will be reset at Application Mode initialization and by an Application Reset Counters Command (LRScmRSTCNT). delta_time LRS_HK Optics Thermistor #3 (Laser Side Barrel #3 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #3 (Laser Side Barrel #3) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK SD Memory Conflicts counts LRS_HK referenceInformation This 16-bit counter is incremented each time the Application Mode is still accessing Stellar-Side shared memory when a new LRS cycle starts that includes new Stellar-Side data collection. This conflict is an error, which indicates that shared memory access did not complete in the allocated time and may have caused stale or invalid stellar centroids. This counter starts at 0x0000, and rolls over to 0x0000 when it increments from 0xFFFF. This counter will be reset at Application Mode initialization and by an Application Reset Counters Command (LRScmRSTCNT). delta_time LRS_HK +5VDC LDC Monitor volts LRS_HK referenceInformation Voltage of +5VDC LDC Monitor - 0x0000 = 0.000 V; 0xA000 = +5.000 V (nominal value); 0xFFFF = +8.000 V : A_LRS_HK.ANALOGHK[12] delta_time LRS_HK Number of memory words dumped counts LRS_HK referenceInformation This 32-bit counter records the total number of memory words dumped during Failsafe Mode processing of Failsafe Dump Memory Command (LRSfscmDPMEM). It starts at 0x00000000, and rolls over to 0x00000000 when it increments from 0xFFFFFFFF. This counter will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK Laser Detector Card Temperature degreesC LRS_HK referenceInformation Temperature of Laser Detector Card - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Reference Voltage volts LRS_HK referenceInformation Reference Voltage - 0x0000 = 0.000 V; 0x8000 = +2.000 V (nominal value); 0xFFFF = +4.000 V : A_LRS_HK.ANALOGHK[2] delta_time LRS_HK Optics Thermistor #5 (Metering Bars #2 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #5 (Metering Bars #2) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Optics Thermistor #6 (Metering Bars #3 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #6 (Metering Bars #3) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK SD background counts LRS_HK referenceInformation The 16-bit values are measures of the measured detector background of the stellar side after subtracting the predicted dark frame. Each is a scaled average of the background levels from all tracking windows on that detector, for all measurements in the preceding one (1) second. Because the search and imaging windows move around, these values should be expected to fluctuate significantly; however, they are an indication of how well the predicted dark frame matches the background (stray light) levels. If they are occasionally very large, there is probably a stray light problem. If they are consistently very large, there is probably error in the dark frame calibration. delta_time LRS_HK Stellar Detector Card Temperature counts LRS_HK referenceInformation Temperature of Stellar Detector Card - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK +3.3VDC Monitor volts LRS_HK referenceInformation Voltage of +3.3VDC Monitor - 0x0000 = 0.000 V; 0xD333 = +3.300 V (nominal value); 0xFFFF = +4.000 V : A_LRS_HK.ANALOGHK[18] delta_time 1 LRS_HK Checksum Status Register - SRAM Laser Detector Dark Frame Checksum LRS_HK 0 1 referenceInformation SRAM Laser Detector (LD) Dark Frame data checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK +12VDC Current Monitor amps LRS_HK referenceInformation Amperage of +12VDC Current Monitor - 0x0000 = 0.000 A; 0xFFFF = +0.400 A : A_LRS_HK.ANALOGHK[7] delta_time LRS_HK +5VDC Supply Monitor volts LRS_HK referenceInformation Voltage of +5VDC Supply Monitor - 0x0000 = 0.000 V; 0xA000 = +5.000 V (nominal value); 0xFFFF = +8.000 V : A_LRS_HK.ANALOGHK[16] delta_time degreesC LRS_HK Optics Thermistor #10 (Stellar Side Shroud Temperature) LRS_HK referenceInformation Temperature of Optics Thermistor #10 (Stellar Side Shroud) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Checksum Status Register - EEPROM Boot Config Checksum 1 LRS_HK 0 1 referenceInformation EEPROM Boot Configuration (BC) checksum (0=PASSED (normal operating condition) 1=FAILED (abnormal condition)) delta_time passed failed 0 1 LRS_HK System Status Register - LDC Power and Signals Enable Status 1 LRS_HK 0 1 referenceInformation The current status of the LRS FPGA LDC (Laser Detector Card) Power and Signals. (0 = DISABLED (abnormal condition); 1 = ENABLED (normal operating condition)) delta_time disabled enabled 0 1 ms LRS_HK LRS_HK Oscillator Offset referenceInformation Oscillator Offset (milliseconds) for TOD (time of day) correction. delta_time LRS_HK System Status Register HK Working 1 LRS_HK 0 1 referenceInformation The current status of the Housekeeping working (0 = Finished Execution; 1 = Executing ). Note: The FPGA toggles these values based on what logic is executing, so they may show up as 0 or 1 based on when the packet is generated delta_time finished executing 0 1 LRS_HK Optics Thermistor #9 (Stellar Side Barrel #3 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #9 (Stellar Side Barrel #3) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Optics Thermistor #7 (Stellar Side Barrel #1 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #7 (Stellar Side Barrel #1) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Stellar Pattern Rate Z radians/second LRS_HK referenceInformation Z (rotation) component of the stellar rate pattern estimate delta_time LRS_HK System Status Register - SDC Power and Signals Enable Status 1 LRS_HK 0 1 referenceInformation The current status of the LRS FPGA SDC (Stellar Detector Card) Power and Signals. (0 = DISABLED (abnormal condition); 1 = ENABLED (normal operating condition)) delta_time disabled enabled 0 1 LRS_HK +1.8VDC Monitor Voltage volts LRS_HK referenceInformation Volage of +1.8VDC Monitor - 0x0000 = 0.000 V; 0x7332 = 1.800 V (nominal); 0xFFFF = +4.000 V : A_LRS_HK.ANALOGHK[19] delta_time LRS_HK System Status Register - SDC Status 1 LRS_HK 0 1 referenceInformation The current status of the Stellar Detector Card (SDC) working (0 = Finished Execution; 1 = Executing). Note: The FPGA toggles these values based on what logic is executing, so they may show up as 0 or 1 based on when the packet is generated delta_time finished executing 0 1 LRS_HK Power Converter Card Temperature degreesC LRS_HK referenceInformation Temperature of Power Converter Card - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Optics Thermistor #2 (Laser Side Barrel #2 Temperature) degreesC LRS_HK referenceInformation Temperature of Optics Thermistor #2 (Laser Side Barrel #2) - 0x0000 = 0.000 V (nominal short); 0xFFFF = +4.000 V (nominal open) [see thermistor scaling section later for temperature scaling] delta_time LRS_HK Spacewire words dropped due to timeout waiting for full CCSDS packet counts LRS_HK referenceInformation This 32-bit counter is incremented each time a spacewire command word is dropped by Failsafe Mode due to a timeout while waiting for a full CCSDS packet (an abnormal condition). It starts at 0x00000000, and rolls over to 0x00000000 when it increments from 0xFFFFFFFF. This counter will be reset at power on and by a Failsafe Reset Counters Command (LRSfscmRSTCNT). delta_time LRS_HK System Status Register - SDC Analog Cable Status 1 LRS_HK 0 1 referenceInformation The current status of the LRS FPGA SDCD (Stellar Detector Card Digital Cable. (0 = DISCONNECTED (abnormal condition); 1 = CONNECTED (normal operating condition)) delta_time disconnected connected 0 1 LRS_HK +5VDC Current Monitor amps LRS_HK referenceInformation Amperage of +5VDC Current Monitor - 0x0000 = 0.000 A; 0xFFFF = +0.400 A : A_LRS_HK.ANALOGHK[8] delta_time LRS_HK Spacewire Status Register - Last Packet Error 1 LRS_HK 0 3 referenceInformation This is the Last Packet Error Code portion of the LRS spacewire interface register. delta_time no_error eep_rec incomplete_sw invalid 0 1 2 3 LRS_HK System Status Register - LDC Analog Cable Status 1 LRS_HK 0 1 referenceInformation The current status of the LRS FPGA LDCA (Laser Detector Card Analog) Cable. (0 = DISCONNECTED (abnormal condition); 1 = CONNECTED (normal operating condition)) delta_time disconnected connected 0 1 LRS_HK Spacewire Status Register - Status 1 LRS_HK 0 1 referenceInformation This is the status flag portion of the LRS spacewire interface status register. delta_time not_running running 0 1 delta_time Contains parameters relating to the Application Housekeeping Packet (LRStmHK)(APID 1120). The (Application Mode) Housekeeping Packet provides all LRS health and safety data. It is normally reported and stored at a 1 Hz rate. Data within this group are stored at the data rate of the source LRS Housekeeping Data (nominally once per second). Granule Start Time time seconds since 2018-01-01 Operations referenceInformation Number of GPS seconds since the ATLAS SDP epoch at the start of the granule. At the time of ATL02 creation, the equator crossing time is not precisely known.. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Cycle Number 1 0 50 referenceInformation A count of the number of exact repeats of this reference orbit. delta_time Operations Orbit Number 1 1 65000 referenceInformation Unique identifying number for each planned ICESat-2 orbit. delta_time Operations Reference Ground track 1 Operations 1 1387 referenceInformation The reference ground track (RGT) is the track on the earth at which a specified unit vector within the observatory is pointed. Under nominal operating conditions, there will be no data collected along the RGT, as the RGT is spanned by GT3 and GT4. During slews or off-pointing, it is possible that ground tracks may intersect the RGT. The ICESat-2 mission has 1387 RGTs. delta_time delta_time Contains orbit information. Data within this group are stored at the data rate of the source PCE Altimetric Data Packets. (nominally fifty per second.) Dimension scale for QA statistics 1 Derived (QA) qualityInformation QA statistics array index number_of_points minimum maximum average standard_deviation 1 2 3 4 5 Granule Failure Reason 1 0 5 qualityInformation Flag indicating granule failure reason. 0=no failure; 1=processing error; 2=Insufficient output data was generated; 3=An uncorrected TxRx slip condition was detected; 4=TBD_Failure; 5=other failure. no_failure NO_SIM_HK NO_PMF_TIME TIME_OF_DAY_FAILURE TIME_OF_FLIGHT_FAILURE OTHER_FAILURE 0 1 2 3 4 5 Operations Granule Pass Flag 1 0 1 qualityInformation Flag indicating granule quality. 0=granule passes automatic QA. 1=granule fails automatic QA. PASS FAIL 0 1 Operations Contains quality assessment data. This may include QA counters, QA along-track data and/or QA summary data. ds_statistics Elapsed UTC seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of seconds since the ATLAS SDP epoch at the start of the QA interval. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of seconds since the ATLAS SDP epoch at the end of the QA interval. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. delta_time_start Along-track statistics Number of duplicates counts Derived (QA) qualityInformation The number of duplicate Rx events detected in the along-track interval. ../delta_time_start counts Number of Weak Rx Events Derived (QA) qualityInformation The number of Weak Rx events in the along-track interval. ../delta_time_start counts Number of Strong Rx Events Derived (QA) qualityInformation The number of Strong Rx events in the along-track interval. ../delta_time_start Number of TEPs counts Derived (QA) qualityInformation The number of TEP events detected in the along-track interval. ../delta_time_start Number of Tx Pulses counts Derived (QA) qualityInformation The number of Tx Pulses in the along-track interval. ../delta_time_start QA Tx LL Stat counts Derived (QA) qualityInformation Along-track statistic of Transmit Leading Lower time of flight. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA Tx Other Stat counts Derived (QA) qualityInformation Along-track statistic of the Other Transmit time of flight measurement. For PCE1, this is Transmit Leading Upper edge (LU) time; for PCE2 this is Transmit Trailing Upper edge (TU) time; and for PCE3 this is Transmit Trailing Lower edge (TL) time. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Along-track statistics Number of duplicates counts Derived (QA) qualityInformation The number of duplicate Rx events detected in the along-track interval. ../delta_time_start counts Number of Weak Rx Events Derived (QA) qualityInformation The number of Weak Rx events in the along-track interval. ../delta_time_start counts Number of Strong Rx Events Derived (QA) qualityInformation The number of Strong Rx events in the along-track interval. ../delta_time_start Number of TEPs counts Derived (QA) qualityInformation The number of TEP events detected in the along-track interval. ../delta_time_start Number of Tx Pulses counts Derived (QA) qualityInformation The number of Tx Pulses in the along-track interval. ../delta_time_start QA Tx LL Stat counts Derived (QA) qualityInformation Along-track statistic of Transmit Leading Lower time of flight. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA Tx Other Stat counts Derived (QA) qualityInformation Along-track statistic of the Other Transmit time of flight measurement. For PCE1, this is Transmit Leading Upper edge (LU) time; for PCE2 this is Transmit Trailing Upper edge (TU) time; and for PCE3 this is Transmit Trailing Lower edge (TL) time. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Along-track statistics Number of duplicates counts Derived (QA) qualityInformation The number of duplicate Rx events detected in the along-track interval. ../delta_time_start counts Number of Weak Rx Events Derived (QA) qualityInformation The number of Weak Rx events in the along-track interval. ../delta_time_start counts Number of Strong Rx Events Derived (QA) qualityInformation The number of Strong Rx events in the along-track interval. ../delta_time_start Number of Tx Pulses counts Derived (QA) qualityInformation The number of Tx Pulses in the along-track interval. ../delta_time_start QA Tx LL Stat counts Derived (QA) qualityInformation Along-track statistic of Transmit Leading Lower time of flight. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA Tx Other Stat counts Derived (QA) qualityInformation Along-track statistic of the Other Transmit time of flight measurement. For PCE1, this is Transmit Leading Upper edge (LU) time; for PCE2 this is Transmit Trailing Upper edge (TU) time; and for PCE3 this is Transmit Trailing Lower edge (TL) time. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Along-track statistics Event count statistics EDACStartTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_DBE bit TDC_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOEmpty bit Burst_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the Burst_FIFOEmpty bit TDC_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOWentFull bit alt_t0_cnt instances 1 dfc_hk qualityInformation Number of instances where the alt_t0_cnt increment is not 200. SDRAMMismatch_Err changes 1 dfc_hk qualityInformation Number of changes in the SDRAMMismatch_Err bit major frame gap instances 1 dfc_hk qualityInformation Number of instances where there is a gap in the major_frame counter values. DidNotFinishWritingData_Err changes 1 dfc_hk qualityInformation Number of changes in the DidNotFinishWritingData_Err bit TDC_FIFOHalfFull changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOHalfFull bit DidNotFinishTransfer_Err changes 1 dfc_hk qualityInformation Number of changes in the DidNotFinishTransfer_Err bit alt_sci_seg_limit changes 1 dfc_hk qualityInformation Number of changes in the alt_sci_seg_limit TDC_WeakPath_Err changes 1 dfc_hk qualityInformation Number of changes in the TDC_WeakPath_Err bit EDACCardReadoutRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardReadoutRAM_SBE bit EDACMFNumber_SBE changes 1 qualityInformation Number of changes in the EDACMFNumber_SBE bit dfc_hk PacketizerA_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the PacketizerA_FIFOWentFull bit SpwRxInvalidOpcode_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxInvalidOpcode_Err bit EDACPacketFIFO_B_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_B_DBE bit alt_gp_reg changes 1 dfc_hk qualityInformation Number of changes in the alt_gp_reg EDACCardCreationRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardCreationRAM_SBE bit Number of nested_exits 1 dfc_hk qualityInformation Number of instances where a nested_exit condition is possible. mode changes 1 pmf_hk qualityInformation Number of changes in the mode cmd_err_cntr changes 1 pmf_hk qualityInformation Number of changes in the cmd_err_cntr StartTag_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the StartTag_FIFOWentFull bit PacketizerA_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the PacketizerA_FIFOEmpty bit EDACBurstFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACBurstFIFO_SBE bit EDACSingleBitErrorCnt changes 1 dfc_hk qualityInformation Number of changes in the EDACSingleBitErrorCnt byte SpwRxInvalidLength_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxInvalidLength_Err bit EDACSDRAM_A_DBEchanges 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_A_DBE bit spw_not_ready_cnt changes 1 dfc_hk qualityInformation Number of changes in spw_not_ready_cnt alt_write_watchdog changes 1 dfc_hk qualityInformation Number of changes in the alt_write_watchdog Tracking_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the Tracking_FIFOEmpty bit StartDataCollection changes 1 dfc_hk qualityInformation Number of changes in the StartDataCollection bit EDACPacketFIFO_B_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_B_SBE bit alt_dupe_margin changes 1 dfc_hk qualityInformation Number of changes in the alt_dupe_margin EDACStartTagFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_SBE bit EDACStartTrackingFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTrackingFIFO_SBE bit autorestartdfccount changes 1 pmf_hk qualityInformation Number of changes in the autorestartdfccount EDACPacketFIFO_A_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_A_DBE bit alt_mframe_freq changes 1 qualityInformation Number of changes in the alt_mframe_freq dfc_hk EDACCardFlagRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardFlagRAM_SBE bit EDACSDRAM_B_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_B_SBE bit alt_config changes 1 dfc_hk qualityInformation Number of changes in the alt_config EDACStartTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_DBE bit SpwRxEEP_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxEEP_Err bit SpWDisconnectErrorCount changes 1 dfc_hk qualityInformation Number of changes in the SpWDisconnectErrorCount bit EDACEventTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACEventTagFIFO_DBE bit EDACEventTagFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACEventTagFIFO_SBE bit TDC_StrongPath_Err changes 1 dfc_hk qualityInformation Number of changes in the TDC_StrongPath_Err bit activeknobstable changes 1 pmf_hk qualityInformation Number of changes in the activeknobstable PacketizerB_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the PacketizerB_FIFOEmpty bit Tracking_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the Tracking_FIFOWentFull bit alt_sci_addr changes 1 dfc_hk qualityInformation Number of changes in the alt_sci_addr TxPulsesInMajorFrame changes 1 dfc_hk qualityInformation Number of changes in the TxPulsesInMajorFrame bit EDACCardCreationRAM_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardCreationRAM_DBE bit cmd_suc_cntr changes 1 pmf_hk qualityInformation Number of changes in the cmd_suc_cntr EDACPacketFIFO_A_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_A_SBE bit alt_wait_watchdog changes 1 dfc_hk qualityInformation Number of changes in the alt_wait_watchdog PacketizerB_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the PacketizerB_FIFOWentFull bit Burst_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the Burst_FIFOWentFull bit SpWDebugMuxOut changes 1 dfc_hk qualityInformation Number of changes in the SpWDebugMuxOut bit RangeWindowDropout_Err changes 1 dfc_hk qualityInformation Number of changes in the RangeWindowDropout_Err bit EDACSDRAM_B_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_B_DBE bit CardDataNotFinished_Err changes 1 dfc_hk qualityInformation Number of changes in the CardDataNotFinished_Err bit alt_debug_reg changes 1 dfc_hk qualityInformation Number of changes in the alt_debug_reg alt_cmd_cnt increments 1 dfc_hk qualityInformation Number of increments in the alt_cmd_cnt alt_cal_interval changes 1 dfc_hk qualityInformation Number of changes in the alt_cal_interval EDACSDRAM_A_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_A_SBE bit CurrentReadSDRAMBuffer changes 1 dfc_hk qualityInformation Number of changes in the CurrentReadSDRAMBuffer bit EventTag_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the EventTag_FIFOWentFull bit EDACStartTrackingFIFO_DBE changes 1 qualityInformation Number of changes in the EDACStartTrackingFIFO_DBE bit dfc_hk SpWParityErrorCount changes 1 dfc_hk qualityInformation Number of changes in the SpWParityErrorCount bit EventTag_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the EventTag_FIFOEmpty bit EDACCardReadoutRAM_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardReadoutRAM_DBE bit EDACMFNumber_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACMFNumber_DBE bit alt_last_opcode changes 1 dfc_hk qualityInformation Number of changes in the alt_last_opcode EDACBurstFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACBurstFIFO_DBE bit StartTag_FIFOEmpty changes 1 qualityInformation Number of changes in the StartTag_FIFOEmpty bit dfc_hk Per-PCE event count statistics EDACStartTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_DBE bit TDC_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOEmpty bit Burst_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the Burst_FIFOEmpty bit TDC_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOWentFull bit alt_t0_cnt instances 1 dfc_hk qualityInformation Number of instances where the alt_t0_cnt increment is not 200. SDRAMMismatch_Err changes 1 dfc_hk qualityInformation Number of changes in the SDRAMMismatch_Err bit major frame gap instances 1 dfc_hk qualityInformation Number of instances where there is a gap in the major_frame counter values. DidNotFinishWritingData_Err changes 1 dfc_hk qualityInformation Number of changes in the DidNotFinishWritingData_Err bit TDC_FIFOHalfFull changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOHalfFull bit DidNotFinishTransfer_Err changes 1 dfc_hk qualityInformation Number of changes in the DidNotFinishTransfer_Err bit alt_sci_seg_limit changes 1 dfc_hk qualityInformation Number of changes in the alt_sci_seg_limit TDC_WeakPath_Err changes 1 dfc_hk qualityInformation Number of changes in the TDC_WeakPath_Err bit EDACCardReadoutRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardReadoutRAM_SBE bit EDACMFNumber_SBE changes 1 qualityInformation Number of changes in the EDACMFNumber_SBE bit dfc_hk PacketizerA_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the PacketizerA_FIFOWentFull bit SpwRxInvalidOpcode_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxInvalidOpcode_Err bit EDACPacketFIFO_B_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_B_DBE bit alt_gp_reg changes 1 dfc_hk qualityInformation Number of changes in the alt_gp_reg EDACCardCreationRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardCreationRAM_SBE bit Number of nested_exits 1 dfc_hk qualityInformation Number of instances where a nested_exit condition is possible. mode changes 1 pmf_hk qualityInformation Number of changes in the mode cmd_err_cntr changes 1 pmf_hk qualityInformation Number of changes in the cmd_err_cntr StartTag_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the StartTag_FIFOWentFull bit PacketizerA_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the PacketizerA_FIFOEmpty bit EDACBurstFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACBurstFIFO_SBE bit EDACSingleBitErrorCnt changes 1 dfc_hk qualityInformation Number of changes in the EDACSingleBitErrorCnt byte SpwRxInvalidLength_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxInvalidLength_Err bit EDACSDRAM_A_DBEchanges 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_A_DBE bit spw_not_ready_cnt changes 1 dfc_hk qualityInformation Number of changes in spw_not_ready_cnt alt_write_watchdog changes 1 dfc_hk qualityInformation Number of changes in the alt_write_watchdog Tracking_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the Tracking_FIFOEmpty bit StartDataCollection changes 1 dfc_hk qualityInformation Number of changes in the StartDataCollection bit EDACPacketFIFO_B_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_B_SBE bit alt_dupe_margin changes 1 dfc_hk qualityInformation Number of changes in the alt_dupe_margin EDACStartTagFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_SBE bit EDACStartTrackingFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTrackingFIFO_SBE bit autorestartdfccount changes 1 pmf_hk qualityInformation Number of changes in the autorestartdfccount EDACPacketFIFO_A_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_A_DBE bit alt_mframe_freq changes 1 qualityInformation Number of changes in the alt_mframe_freq dfc_hk EDACCardFlagRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardFlagRAM_SBE bit EDACSDRAM_B_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_B_SBE bit alt_config changes 1 dfc_hk qualityInformation Number of changes in the alt_config EDACStartTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_DBE bit SpwRxEEP_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxEEP_Err bit SpWDisconnectErrorCount changes 1 dfc_hk qualityInformation Number of changes in the SpWDisconnectErrorCount bit EDACEventTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACEventTagFIFO_DBE bit EDACEventTagFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACEventTagFIFO_SBE bit TDC_StrongPath_Err changes 1 dfc_hk qualityInformation Number of changes in the TDC_StrongPath_Err bit activeknobstable changes 1 pmf_hk qualityInformation Number of changes in the activeknobstable PacketizerB_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the PacketizerB_FIFOEmpty bit Tracking_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the Tracking_FIFOWentFull bit alt_sci_addr changes 1 dfc_hk qualityInformation Number of changes in the alt_sci_addr TxPulsesInMajorFrame changes 1 dfc_hk qualityInformation Number of changes in the TxPulsesInMajorFrame bit EDACCardCreationRAM_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardCreationRAM_DBE bit cmd_suc_cntr changes 1 pmf_hk qualityInformation Number of changes in the cmd_suc_cntr EDACPacketFIFO_A_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_A_SBE bit alt_wait_watchdog changes 1 dfc_hk qualityInformation Number of changes in the alt_wait_watchdog PacketizerB_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the PacketizerB_FIFOWentFull bit Burst_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the Burst_FIFOWentFull bit SpWDebugMuxOut changes 1 dfc_hk qualityInformation Number of changes in the SpWDebugMuxOut bit RangeWindowDropout_Err changes 1 dfc_hk qualityInformation Number of changes in the RangeWindowDropout_Err bit EDACSDRAM_B_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_B_DBE bit CardDataNotFinished_Err changes 1 dfc_hk qualityInformation Number of changes in the CardDataNotFinished_Err bit alt_debug_reg changes 1 dfc_hk qualityInformation Number of changes in the alt_debug_reg alt_cmd_cnt increments 1 dfc_hk qualityInformation Number of increments in the alt_cmd_cnt alt_cal_interval changes 1 dfc_hk qualityInformation Number of changes in the alt_cal_interval EDACSDRAM_A_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_A_SBE bit CurrentReadSDRAMBuffer changes 1 dfc_hk qualityInformation Number of changes in the CurrentReadSDRAMBuffer bit EventTag_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the EventTag_FIFOWentFull bit EDACStartTrackingFIFO_DBE changes 1 qualityInformation Number of changes in the EDACStartTrackingFIFO_DBE bit dfc_hk SpWParityErrorCount changes 1 dfc_hk qualityInformation Number of changes in the SpWParityErrorCount bit EventTag_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the EventTag_FIFOEmpty bit EDACCardReadoutRAM_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardReadoutRAM_DBE bit EDACMFNumber_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACMFNumber_DBE bit alt_last_opcode changes 1 dfc_hk qualityInformation Number of changes in the alt_last_opcode EDACBurstFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACBurstFIFO_DBE bit StartTag_FIFOEmpty changes 1 qualityInformation Number of changes in the StartTag_FIFOEmpty bit dfc_hk Per-PCE event count statistics EDACStartTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_DBE bit TDC_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOEmpty bit Burst_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the Burst_FIFOEmpty bit TDC_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOWentFull bit alt_t0_cnt instances 1 dfc_hk qualityInformation Number of instances where the alt_t0_cnt increment is not 200. SDRAMMismatch_Err changes 1 dfc_hk qualityInformation Number of changes in the SDRAMMismatch_Err bit major frame gap instances 1 dfc_hk qualityInformation Number of instances where there is a gap in the major_frame counter values. DidNotFinishWritingData_Err changes 1 dfc_hk qualityInformation Number of changes in the DidNotFinishWritingData_Err bit TDC_FIFOHalfFull changes 1 dfc_hk qualityInformation Number of changes in the TDC_FIFOHalfFull bit DidNotFinishTransfer_Err changes 1 dfc_hk qualityInformation Number of changes in the DidNotFinishTransfer_Err bit alt_sci_seg_limit changes 1 dfc_hk qualityInformation Number of changes in the alt_sci_seg_limit TDC_WeakPath_Err changes 1 dfc_hk qualityInformation Number of changes in the TDC_WeakPath_Err bit EDACCardReadoutRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardReadoutRAM_SBE bit EDACMFNumber_SBE changes 1 qualityInformation Number of changes in the EDACMFNumber_SBE bit dfc_hk PacketizerA_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the PacketizerA_FIFOWentFull bit SpwRxInvalidOpcode_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxInvalidOpcode_Err bit EDACPacketFIFO_B_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_B_DBE bit alt_gp_reg changes 1 dfc_hk qualityInformation Number of changes in the alt_gp_reg EDACCardCreationRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardCreationRAM_SBE bit Number of nested_exits 1 dfc_hk qualityInformation Number of instances where a nested_exit condition is possible. mode changes 1 pmf_hk qualityInformation Number of changes in the mode cmd_err_cntr changes 1 pmf_hk qualityInformation Number of changes in the cmd_err_cntr StartTag_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the StartTag_FIFOWentFull bit PacketizerA_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the PacketizerA_FIFOEmpty bit EDACBurstFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACBurstFIFO_SBE bit EDACSingleBitErrorCnt changes 1 dfc_hk qualityInformation Number of changes in the EDACSingleBitErrorCnt byte SpwRxInvalidLength_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxInvalidLength_Err bit EDACSDRAM_A_DBEchanges 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_A_DBE bit spw_not_ready_cnt changes 1 dfc_hk qualityInformation Number of changes in spw_not_ready_cnt alt_write_watchdog changes 1 dfc_hk qualityInformation Number of changes in the alt_write_watchdog Tracking_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the Tracking_FIFOEmpty bit StartDataCollection changes 1 dfc_hk qualityInformation Number of changes in the StartDataCollection bit EDACPacketFIFO_B_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_B_SBE bit alt_dupe_margin changes 1 dfc_hk qualityInformation Number of changes in the alt_dupe_margin EDACStartTagFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_SBE bit EDACStartTrackingFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTrackingFIFO_SBE bit autorestartdfccount changes 1 pmf_hk qualityInformation Number of changes in the autorestartdfccount EDACPacketFIFO_A_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_A_DBE bit alt_mframe_freq changes 1 qualityInformation Number of changes in the alt_mframe_freq dfc_hk EDACCardFlagRAM_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardFlagRAM_SBE bit EDACSDRAM_B_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_B_SBE bit alt_config changes 1 dfc_hk qualityInformation Number of changes in the alt_config EDACStartTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACStartTagFIFO_DBE bit SpwRxEEP_Err changes 1 dfc_hk qualityInformation Number of changes in the SpwRxEEP_Err bit SpWDisconnectErrorCount changes 1 dfc_hk qualityInformation Number of changes in the SpWDisconnectErrorCount bit EDACEventTagFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACEventTagFIFO_DBE bit EDACEventTagFIFO_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACEventTagFIFO_SBE bit TDC_StrongPath_Err changes 1 dfc_hk qualityInformation Number of changes in the TDC_StrongPath_Err bit activeknobstable changes 1 pmf_hk qualityInformation Number of changes in the activeknobstable PacketizerB_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the PacketizerB_FIFOEmpty bit Tracking_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the Tracking_FIFOWentFull bit alt_sci_addr changes 1 dfc_hk qualityInformation Number of changes in the alt_sci_addr TxPulsesInMajorFrame changes 1 dfc_hk qualityInformation Number of changes in the TxPulsesInMajorFrame bit EDACCardCreationRAM_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardCreationRAM_DBE bit cmd_suc_cntr changes 1 pmf_hk qualityInformation Number of changes in the cmd_suc_cntr EDACPacketFIFO_A_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACPacketFIFO_A_SBE bit alt_wait_watchdog changes 1 dfc_hk qualityInformation Number of changes in the alt_wait_watchdog PacketizerB_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the PacketizerB_FIFOWentFull bit Burst_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the Burst_FIFOWentFull bit SpWDebugMuxOut changes 1 dfc_hk qualityInformation Number of changes in the SpWDebugMuxOut bit RangeWindowDropout_Err changes 1 dfc_hk qualityInformation Number of changes in the RangeWindowDropout_Err bit EDACSDRAM_B_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_B_DBE bit CardDataNotFinished_Err changes 1 dfc_hk qualityInformation Number of changes in the CardDataNotFinished_Err bit alt_debug_reg changes 1 dfc_hk qualityInformation Number of changes in the alt_debug_reg alt_cmd_cnt increments 1 dfc_hk qualityInformation Number of increments in the alt_cmd_cnt alt_cal_interval changes 1 dfc_hk qualityInformation Number of changes in the alt_cal_interval EDACSDRAM_A_SBE changes 1 dfc_hk qualityInformation Number of changes in the EDACSDRAM_A_SBE bit CurrentReadSDRAMBuffer changes 1 dfc_hk qualityInformation Number of changes in the CurrentReadSDRAMBuffer bit EventTag_FIFOWentFull changes 1 dfc_hk qualityInformation Number of changes in the EventTag_FIFOWentFull bit EDACStartTrackingFIFO_DBE changes 1 qualityInformation Number of changes in the EDACStartTrackingFIFO_DBE bit dfc_hk SpWParityErrorCount changes 1 dfc_hk qualityInformation Number of changes in the SpWParityErrorCount bit EventTag_FIFOEmpty changes 1 dfc_hk qualityInformation Number of changes in the EventTag_FIFOEmpty bit EDACCardReadoutRAM_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACCardReadoutRAM_DBE bit EDACMFNumber_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACMFNumber_DBE bit alt_last_opcode changes 1 dfc_hk qualityInformation Number of changes in the alt_last_opcode EDACBurstFIFO_DBE changes 1 dfc_hk qualityInformation Number of changes in the EDACBurstFIFO_DBE bit StartTag_FIFOEmpty changes 1 qualityInformation Number of changes in the StartTag_FIFOEmpty bit dfc_hk Per-PCE event count statistics Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of seconds since the ATLAS SDP epoch at the start of the QA interval. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Number of LRS Laser Centroid inputs. counts Derived (QA) qualityInformation The number of LRS Laser Centroid inputs processed. delta_time_start Number of LRS Laser Window inputs. counts Derived (QA) qualityInformation The number of LRS Laser Window inputs processed. delta_time_start Number of A_HKT_E inputs. counts Derived (QA) qualityInformation The number of A_HKT_E inputs processed. delta_time_start Number of A_HKT_B inputs. counts Derived (QA) qualityInformation The number of A_HKT_B inputs processed. delta_time_start Number of A_HKT_D inputs. counts Derived (QA) qualityInformation The number of A_HKT_D inputs processed. delta_time_start Number of A_HKT_STATUS inputs. counts Derived (QA) qualityInformation The number of A_HKT_STATUS inputs processed. delta_time_start Number of SC3 inputs. counts Derived (QA) qualityInformation The number of SC3 inputs processed. delta_time_start Number of LRS HK inputs. counts Derived (QA) qualityInformation The number of LRS HK inputs processed. delta_time_start Number of LRS Stellar Centroid inputs. counts Derived (QA) qualityInformation The number of LRS Stellar Centroid inputs processed. delta_time_start Number of LRS Stellar Window inputs. counts Derived (QA) qualityInformation The number of LRS Stellar Window inputs processed. delta_time_start Number of A_SLA_HK inputs. counts Derived (QA) qualityInformation The number of A_SLA_HK inputs processed. delta_time_start Number of A_MCE_POS inputs. counts qualityInformation The number of A_MCE_POS inputs processed. delta_time_start Derived (QA) Number of A_HKT_C inputs. counts Derived (QA) qualityInformation The number of A_HKT_C inputs processed. delta_time_start Number of SC4 inputs. counts Derived (QA) qualityInformation The number of SC4 inputs processed. delta_time_start Number of A_HKT_A inputs. counts Derived (QA) qualityInformation The number of A_HKT_A inputs processed. delta_time_start Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of seconds since the ATLAS SDP epoch at the end of the interval. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Number of A_SC_PON inputs. counts Derived (QA) qualityInformation The number of A_SC_PON inputs processed. delta_time_start Number of SC1 inputs. counts Derived (QA) qualityInformation The number of SC1 inputs processed. delta_time_start Number of A_SC_POS inputs. counts Derived (QA) qualityInformation The number of A_SC_POS inputs processed. delta_time_start Number of A_SC_TAT inputs. counts Derived (QA) qualityInformation The number of A_SC_TAT inputs processed. delta_time_start Number of LRS Laser Image inputs. counts Derived (QA) qualityInformation The number of LRS Laser Image inputs processed. delta_time_start Number of LRS Stellar Image inputs. counts Derived (QA) qualityInformation The number of LRS Stellar Image inputs processed. delta_time_start Number of SIM_HK inputs. counts Derived (QA) qualityInformation The number of SIM_HK inputs processed. delta_time_start Number of SC2 inputs. counts Derived (QA) qualityInformation The number of SC2 inputs processed. delta_time_start Number of LRS TAMS Window inputs. counts Derived (QA) qualityInformation The number of LRS TAMS Window inputs processed. delta_time_start Packet count statistics Number of major frame inputs. counts Derived (QA) qualityInformation The number of major frame inputs processed. ../delta_time_start Number of ATM Strong inputs. counts Derived (QA) qualityInformation The number of ATM strong inputs processed. ../delta_time_start Number of ATM weak inputs. counts Derived (QA) qualityInformation The number of ATM weak inputs processed. ../delta_time_start Number of PMF Algorithm Science inputs. counts qualityInformation The number of PMF Algorithm Science inputs processed. ../delta_time_start Derived (QA) Number of PMF Timekeeping inputs. counts qualityInformation The number of PMF TImekeeping inputs processed. ../delta_time_start Derived (QA) Number of DFC HK Inputs counts Derived (QA) qualityInformation The number of A_DFC_HK inputs processed. ../delta_time_start Number of SXP_SSR inputs. counts Derived (QA) qualityInformation The number of SXP_SSR processed. ../delta_time_start Number of major frame inputs. counts Derived (QA) qualityInformation The number of major frame inputs processed. ../delta_time_start Number of ATM Strong inputs. counts Derived (QA) qualityInformation The number of ATM strong inputs processed. ../delta_time_start Number of ATM weak inputs. counts Derived (QA) qualityInformation The number of ATM weak inputs processed. ../delta_time_start Number of PMF Algorithm Science inputs. counts qualityInformation The number of PMF Algorithm Science inputs processed. ../delta_time_start Derived (QA) Number of PMF Timekeeping inputs. counts qualityInformation The number of PMF TImekeeping inputs processed. ../delta_time_start Derived (QA) Number of DFC HK Inputs counts Derived (QA) qualityInformation The number of A_DFC_HK inputs processed. ../delta_time_start Number of SXP_SSR inputs. counts Derived (QA) qualityInformation The number of SXP_SSR processed. ../delta_time_start Number of major frame inputs. counts Derived (QA) qualityInformation The number of major frame inputs processed. ../delta_time_start Number of ATM Strong inputs. counts Derived (QA) qualityInformation The number of ATM strong inputs processed. ../delta_time_start Number of ATM weak inputs. counts Derived (QA) qualityInformation The number of ATM weak inputs processed. ../delta_time_start Number of PMF Algorithm Science inputs. counts qualityInformation The number of PMF Algorithm Science inputs processed. ../delta_time_start Derived (QA) Number of PMF Timekeeping inputs. counts qualityInformation The number of PMF TImekeeping inputs processed. ../delta_time_start Derived (QA) Number of DFC HK Inputs counts Derived (QA) qualityInformation The number of A_DFC_HK inputs processed. ../delta_time_start Number of SXP_SSR inputs. counts Derived (QA) qualityInformation The number of SXP_SSR processed. ../delta_time_start Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Num LRS Temp OOB counts Derived (QA) qualityInformation Number of instances where the LRS temperature is outside the limit of -20 to 50 degC. delta_time_start Num Bias Offset X OOB counts Derived (QA) qualityInformation Number of instances where the bias offset X value is outside the limit of -70 to 70 microradians. delta_time_start QA for a_sla_hk TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive A_SLA_HK time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for sc_imu TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /sc/intertial_measurement_unit time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Num LRS Mag Invalid counts Derived (QA) qualityInformation Number of instances where an LRS laser magnitude is outside the limit of 0-500. delta_time_start CAL47 temperature OOB counts Derived (QA) qualityInformation Number of instances where the CAL-47 temperature is outside the limit of -20 to 50 degC. delta_time_start Shot Time correlation OOB counts Derived (QA) qualityInformation Where the ratio of unaligned shots/aligned shots exceeds the limit of 0.9; 0=Doesn?t Exceed Limit, 1=Exceeds Limit delta_time_start QA for hk_pdu TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/meb time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Num Internal Temp OOB counts Derived (QA) qualityInformation Number of instances where input laser temperature values exceed the limit of 20 to 40 degC. delta_time_start Num Internal Energy OOB counts Derived (QA) qualityInformation Number of instances where input internal laser energy values exceed the limit of 0 to 200 counts. delta_time_start Num SPD Temp OOB counts Derived (QA) qualityInformation Number of instances where SPD temperature values exceed the limit of -20 to 50 degC. delta_time_start QA for gpsr TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /gpsr time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Num LRS Sums Invalid counts Derived (QA) qualityInformation Number of instances where the sum of the 6 LRS laser spots is outside the limit of 0 to 2000. delta_time_start Num HVPC Bias Mod 5 OOB counts Derived (QA) qualityInformation Number of instances where the HVPC Bias Mod5 value is outside the limit of -2000 to 0 counts. delta_time_start Num Bias Offset Y OOB counts Derived (QA) qualityInformation Number of instances where the bias offset Y value is outside the limit of -70 to 70 microradians. delta_time_start Freewheel Indicated counts Derived (QA) qualityInformation Number of instances where the freewheel flag is non-zero. delta_time_start QA for hk_pointing TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/pointing time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Num HVPC Bias Mod 6 OOB counts Derived (QA) qualityInformation Number of instances where the HVPC Bias Mod6 value is outside the limit of -2000 to 0 counts. delta_time_start Num Internal Energy OOB counts Derived (QA) qualityInformation Number of instances where the computed total internal laser energy is outside the limit of 130 to 2700 microjoules. delta_time_start Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of seconds since the ATLAS SDP epoch at the end of the QA interval. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. QA for hk_pdu TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/pdu time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for hk_therm TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/hk_thermal time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for sc_star_tracker_oh1 TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /sc/star_tracker/optical_head1 time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for hk_laser_energy TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/laser_energy time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for mce_position TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/mce_position time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for acs TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /sc/attitude_control_system time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Num SPD Energy OOB counts Derived (QA) qualityInformation Number of instances where input SPD laser energy values exceed the limit of -30000 to 0 counts. delta_time_start Num HVPC Bias Mod 1 OOB counts qualityInformation Number of instances where the HVPC Bias Mod1 value is outside the limit of -2000 to 0 counts. delta_time_start Derived (QA) QA for sc_star_tracker TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /sc/star_tracker time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Num HVPC Bias Mod 3 OOB counts Derived (QA) qualityInformation Number of instances where the HVPC Bias Mod3 value is outside the limit of -2000 to 0 counts. delta_time_start Num SPD Energy OOB counts Derived (QA) qualityInformation Number of instances where the computed total SPD laser energy is outside the limit of 130 to 2700 microjoules. delta_time_start Num LRS Energy OOB counts Derived (QA) qualityInformation Number of instances where the computed total LRS laser energy is outside the limit of 130 to 2700 microjoules. delta_time_start Num LRS Spots Missing counts Derived (QA) qualityInformation Number of instances where not all 6 laser spots are valid when computing LRS laser energy. delta_time_start AMET Increment OOB counts Derived (QA) qualityInformation Number of instances where the difference between external AMET counter and the GPS 1PPS exceeds the limit of 1.0. delta_time_start Num HVPC Bias Mod 4 OOB counts Derived (QA) qualityInformation Number of instances where the HVPC Bias Mod4 value is outside the limit of -2000 to 0 counts. delta_time_start QA for hk_tat TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/time_at_the_tone time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for hk_pos_vel TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/housekeeping/position_velocity time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for sc_ephemeris TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /sc/ephemeris time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start QA for sc_star_tracker_oh2 TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /sc/star_tracker/optical_head2 time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Num HVPC Bias Mod 2 OOB counts Derived (QA) qualityInformation Number of instances where the HVPC Bias Mod2 value is outside the limit of -2000 to 0 counts. delta_time_start AMET Increment OOB counts Derived (QA) qualityInformation Number of instances where the difference between internal AMET at 1PPS and GPS 1PPS exceed the limit of 100.e6. delta_time_start QA for sc_hk TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /sc/hk time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. delta_time_start Summary statistics QA alt_cal_fall counts Derived (QA) qualityInformation Summary statistic of the full-rate (before interpolation) alt_cal_fall computation. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Tx Leading Fine Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx leading fine count value exceeds the limit of 75 counts. ../delta_time_start Rx Fine Count OOB counts qualityInformation Number of instances where the Rx fine count value exceeds the limit of 75 counts. ../delta_time_start Derived (QA) QA 1P MF missed counts Derived via L1B ATBD qualityInformation The number of times major frame counter was not consecutive. ../delta_time_start Rx Channel ID OOB counts qualityInformation Number of instances where the Rx channel ID contains an unexpected value. ../delta_time_start Derived (QA) Num Weak Return Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed weak return sensitivity value is outside the limit of 0 to 2e18. ../delta_time_start QA from TOD Methods counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between Time_T0_Method1 and Time _T0_Method2. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Num TEP OOB counts Derived (QA) qualityInformation Number of instances where TEP TOF values exceed the limit of 0 to 110ns. ../delta_time_start Rx Coarse Count OOB counts qualityInformation Number of instances where the Rx coarse count value exceeds the limit of 10000 counts. ../delta_time_start Derived (QA) Num Strong Return Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed strong return sensitivity value is outside the limit of 0 to 2e18. ../delta_time_start QA for atm_hist_w TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/atmosphere_weak time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Number of TEPs counts Derived (QA) qualityInformation The number of TEP events detected in the granule. ../delta_time_start QA alt_cal_rise counts Derived (QA) qualityInformation Summary statistic of the full-rate (before interpolation) alt_cal_rise computation. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA for atm_his_st TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/atmosphere_strong time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA for pcex_background TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/background time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA number of instances TX out of bounds counts Derived via L1B ATBD referenceInformation The number of times the Tx count is out of bounds (oob); i.e.: 199 to 201 TX pulses were not reported in a major frame. ../delta_time_start QA Tx Other Stat counts Derived (QA) qualityInformation Summary statistic of the Other Transmit time of flight measurement. For PCE1, this is Transmit Leading Upper edge (LU) time; for PCE2 this is Transmit Trailing Upper edge (TU) time; and for PCE3 this is Transmit Trailing Lower edge (TL) time. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Channel Dupe Percent OOB counts Derived (QA) qualityInformation Number of instances where the per-channel number of duplicates is greater than 10% of the total number of per-channel events. ../delta_time_start Num Weak Bg Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed weak background sensitivity value is outside the limit of 5e17 to 2e18. ../delta_time_start Number of Weak Rx Events counts Derived (QA) qualityInformation The number of Weak Rx events in the granule. ../delta_time_start QA 1PPS missed counts Derived via L1B ATBD qualityInformation Number of times 1 pps was not consecutive. ../delta_time_start Number of Strong Rx Events counts Derived (QA) qualityInformation The number of Strong Rx events in the granule. ../delta_time_start QA for pcex_alt TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/altimetry time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Number of Missed Tx Threshold Crossings counts Derived (QA) qualityInformation The number of Tx pulses in which a missed threshold crossing was detected. The condition occurs if the Tx leading and trailing fine raw counts are the exact same value. ../delta_time_start Number of Tx Pulses counts Derived (QA) qualityInformation The number of Tx Pulses in the granule. ../delta_time_start Tx Coarse Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx coarse count value exceeds the limit of 10000 counts. ../delta_time_start Tx Trailing Fine Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx trailing fine count value exceeds the limit of 75 counts. ../delta_time_start Number of duplicates counts Derived (QA) qualityInformation The number of duplicate Rx events detected in the granule. ../delta_time_start Tx LL OOB counts Derived (QA) qualityInformation Where the maximum minus minimum Tx leading lower exceeds the limit of 39 ns. ../delta_time_start Number of Tx Fine Swaps counts Derived (QA) qualityInformation The number of Tx pulses for which a PCE anomaly forced the Tx fine count values to be swapped. ../delta_time_start QA Tx LL Stat counts Derived (QA) qualityInformation Summary statistic of Transmit Leading Lower time of flight. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Num Strong Bg Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed strong background sensitivity value is outside the limit of 5e17 to 2e18. ../delta_time_start QA alt_cal_fall counts Derived (QA) qualityInformation Summary statistic of the full-rate (before interpolation) alt_cal_fall computation. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Tx Leading Fine Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx leading fine count value exceeds the limit of 75 counts. ../delta_time_start Rx Fine Count OOB counts qualityInformation Number of instances where the Rx fine count value exceeds the limit of 75 counts. ../delta_time_start Derived (QA) QA 1P MF missed counts Derived via L1B ATBD qualityInformation The number of times major frame counter was not consecutive. ../delta_time_start Rx Channel ID OOB counts qualityInformation Number of instances where the Rx channel ID contains an unexpected value. ../delta_time_start Derived (QA) Num Weak Return Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed weak return sensitivity value is outside the limit of 0 to 2e18. ../delta_time_start QA from TOD Methods counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between Time_T0_Method1 and Time _T0_Method2. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Num TEP OOB counts Derived (QA) qualityInformation Number of instances where TEP TOF values exceed the limit of 0 to 110ns. ../delta_time_start Rx Coarse Count OOB counts qualityInformation Number of instances where the Rx coarse count value exceeds the limit of 10000 counts. ../delta_time_start Derived (QA) Num Strong Return Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed strong return sensitivity value is outside the limit of 0 to 2e18. ../delta_time_start QA for atm_hist_w TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/atmosphere_weak time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Number of TEPs counts Derived (QA) qualityInformation The number of TEP events detected in the granule. ../delta_time_start QA alt_cal_rise counts Derived (QA) qualityInformation Summary statistic of the full-rate (before interpolation) alt_cal_rise computation. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA for atm_his_st TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/atmosphere_strong time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA for pcex_background TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/background time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA number of instances TX out of bounds counts Derived via L1B ATBD referenceInformation The number of times the Tx count is out of bounds (oob); i.e.: 199 to 201 TX pulses were not reported in a major frame. ../delta_time_start QA Tx Other Stat counts Derived (QA) qualityInformation Summary statistic of the Other Transmit time of flight measurement. For PCE1, this is Transmit Leading Upper edge (LU) time; for PCE2 this is Transmit Trailing Upper edge (TU) time; and for PCE3 this is Transmit Trailing Lower edge (TL) time. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Channel Dupe Percent OOB counts Derived (QA) qualityInformation Number of instances where the per-channel number of duplicates is greater than 10% of the total number of per-channel events. ../delta_time_start Num Weak Bg Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed weak background sensitivity value is outside the limit of 5e17 to 2e18. ../delta_time_start Number of Weak Rx Events counts Derived (QA) qualityInformation The number of Weak Rx events in the granule. ../delta_time_start QA 1PPS missed counts Derived via L1B ATBD qualityInformation Number of times 1 pps was not consecutive. ../delta_time_start Number of Strong Rx Events counts Derived (QA) qualityInformation The number of Strong Rx events in the granule. ../delta_time_start QA for pcex_alt TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/altimetry time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Number of Missed Tx Threshold Crossings counts Derived (QA) qualityInformation The number of Tx pulses in which a missed threshold crossing was detected. The condition occurs if the Tx leading and trailing fine raw counts are the exact same value. ../delta_time_start Number of Tx Pulses counts Derived (QA) qualityInformation The number of Tx Pulses in the granule. ../delta_time_start Tx Coarse Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx coarse count value exceeds the limit of 10000 counts. ../delta_time_start Tx Trailing Fine Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx trailing fine count value exceeds the limit of 75 counts. ../delta_time_start Number of duplicates counts Derived (QA) qualityInformation The number of duplicate Rx events detected in the granule. ../delta_time_start Tx LL OOB counts Derived (QA) qualityInformation Where the maximum minus minimum Tx leading lower exceeds the limit of 39 ns. ../delta_time_start Number of Tx Fine Swaps counts Derived (QA) qualityInformation The number of Tx pulses for which a PCE anomaly forced the Tx fine count values to be swapped. ../delta_time_start QA Tx LL Stat counts Derived (QA) qualityInformation Summary statistic of Transmit Leading Lower time of flight. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Num Strong Bg Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed strong background sensitivity value is outside the limit of 5e17 to 2e18. ../delta_time_start QA alt_cal_fall counts Derived (QA) qualityInformation Summary statistic of the full-rate (before interpolation) alt_cal_fall computation. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Tx Leading Fine Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx leading fine count value exceeds the limit of 75 counts. ../delta_time_start Rx Fine Count OOB counts qualityInformation Number of instances where the Rx fine count value exceeds the limit of 75 counts. ../delta_time_start Derived (QA) QA 1P MF missed counts Derived via L1B ATBD qualityInformation The number of times major frame counter was not consecutive. ../delta_time_start Rx Channel ID OOB counts qualityInformation Number of instances where the Rx channel ID contains an unexpected value. ../delta_time_start Derived (QA) Num Weak Return Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed weak return sensitivity value is outside the limit of 0 to 2e18. ../delta_time_start QA from TOD Methods counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between Time_T0_Method1 and Time _T0_Method2. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Num TEP OOB counts Derived (QA) qualityInformation Number of instances where TEP TOF values exceed the limit of 0 to 110ns. ../delta_time_start Rx Coarse Count OOB counts qualityInformation Number of instances where the Rx coarse count value exceeds the limit of 10000 counts. ../delta_time_start Derived (QA) Num Strong Return Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed strong return sensitivity value is outside the limit of 0 to 2e18. ../delta_time_start QA for atm_hist_w TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/atmosphere_weak time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Number of TEPs counts Derived (QA) qualityInformation The number of TEP events detected in the granule. ../delta_time_start QA alt_cal_rise counts Derived (QA) qualityInformation Summary statistic of the full-rate (before interpolation) alt_cal_rise computation. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA for atm_his_st TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/atmosphere_strong time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA for pcex_background TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/background time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start QA number of instances TX out of bounds counts Derived via L1B ATBD referenceInformation The number of times the Tx count is out of bounds (oob); i.e.: 199 to 201 TX pulses were not reported in a major frame. ../delta_time_start QA Tx Other Stat counts Derived (QA) qualityInformation Summary statistic of the Other Transmit time of flight measurement. For PCE1, this is Transmit Leading Upper edge (LU) time; for PCE2 this is Transmit Trailing Upper edge (TU) time; and for PCE3 this is Transmit Trailing Lower edge (TL) time. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Channel Dupe Percent OOB counts Derived (QA) qualityInformation Number of instances where the per-channel number of duplicates is greater than 10% of the total number of per-channel events. ../delta_time_start Num Weak Bg Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed weak background sensitivity value is outside the limit of 5e17 to 2e18. ../delta_time_start Number of Weak Rx Events counts Derived (QA) qualityInformation The number of Weak Rx events in the granule. ../delta_time_start QA 1PPS missed counts Derived via L1B ATBD qualityInformation Number of times 1 pps was not consecutive. ../delta_time_start Number of Strong Rx Events counts Derived (QA) qualityInformation The number of Strong Rx events in the granule. ../delta_time_start QA for pcex_alt TOD counts Derived via L1B ATBD qualityInformation Summary statistics on the differences between successive /atlas/pcex/altimetry time of day values. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Number of Missed Tx Threshold Crossings counts Derived (QA) qualityInformation The number of Tx pulses in which a missed threshold crossing was detected. The condition occurs if the Tx leading and trailing fine raw counts are the exact same value. ../delta_time_start Number of Tx Pulses counts Derived (QA) qualityInformation The number of Tx Pulses in the granule. ../delta_time_start Tx Coarse Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx coarse count value exceeds the limit of 10000 counts. ../delta_time_start Tx Trailing Fine Count OOB counts Derived (QA) qualityInformation Number of instances where the Tx trailing fine count value exceeds the limit of 75 counts. ../delta_time_start Number of duplicates counts Derived (QA) qualityInformation The number of duplicate Rx events detected in the granule. ../delta_time_start Tx LL OOB counts Derived (QA) qualityInformation Where the maximum minus minimum Tx leading lower exceeds the limit of 39 ns. ../delta_time_start Number of Tx Fine Swaps counts Derived (QA) qualityInformation The number of Tx pulses for which a PCE anomaly forced the Tx fine count values to be swapped. ../delta_time_start QA Tx LL Stat counts Derived (QA) qualityInformation Summary statistic of Transmit Leading Lower time of flight. Values are in the order number_of_points, minimum, maximum, average, standard_deviation. ../delta_time_start Num Strong Bg Sensitivity OOB counts Derived (QA) qualityInformation Number of instances where the computed strong background sensitivity value is outside the limit of 5e17 to 2e18. ../delta_time_start TxRx Discard Count counts TxRx detection qualityInformation The number of Tx discarded because of data gaps when attempting to repair a TxRx slip. TxRx Repair Count counts TxRx detection qualityInformation The number of Tx misalignments repaired for the PCE indicated in txrx_slip_repair. (0=no repair attempted) TxRx Repair flag 1 TxRx detection 0 3 qualityInformation Indicates the PCE for which a txrx slip repair was attempted. (0=no repair attempted) not_attempted pce1 pce2 pce3 0 1 2 3 Contains statistics and flags related to TOF QA. Beginning major frame counter counts TxRx detection qualityInformation Major frame count at the start of a Tx misalignment. Nested Exit Confidence 1 TxRx detection qualityInformation Confidence level set by nested-exit checks. Histogram Confidence 1 TxRx detection qualityInformation Confidence level set by analysis of TOF histograms. TxRx Slip Flag 1 TxRx detection 0 2 qualityInformation Flag indicating if a TxRx slip condition was detected. not_detected detected 0 1 Too_Few_Tx_in_MFrame 1 Tx processing qualityInformation The number of major frames with less than 199 Tx. The photons associated with these major frames have been discarded from processing. Sawtooth_Period 1/frequency qualityInformation Period of the Tx sawtooth. TxRx detection Ending major frame counter counts TxRx detection qualityInformation Major frame count at the end of a Tx misalignment. Number_of_DNF 1 Tx processing qualityInformation The number of major frames containing a DNF flag, which indicates that the major frame was truncated. By default, these partial major frames are removed from processing. TXRX_Slip_Magnitude seconds TxRx detection qualityInformation Average magnitude (and direction) of Tx sawtooth misalignment. 1.7976931348623157e+308 Nested Exit Times seconds since 2018-01-01 TxRx slip auxiliaryInformation Times of up to 4 NestedExit instances. Units are the number of seconds since the ATLAS SDP epoch. Tx Align Confidence 1 TxRx detection qualityInformation Confidence level set by Tx alignment (sawtooth) checks. Per-PCE TOF flags and statistics Beginning major frame counter counts TxRx detection qualityInformation Major frame count at the start of a Tx misalignment. Nested Exit Confidence 1 TxRx detection qualityInformation Confidence level set by nested-exit checks. Histogram Confidence 1 TxRx detection qualityInformation Confidence level set by analysis of TOF histograms. TxRx Slip Flag 1 TxRx detection 0 2 qualityInformation Flag indicating if a TxRx slip condition was detected. not_detected detected 0 1 Too_Few_Tx_in_MFrame 1 Tx processing qualityInformation The number of major frames with less than 199 Tx. The photons associated with these major frames have been discarded from processing. Sawtooth_Period 1/frequency qualityInformation Period of the Tx sawtooth. TxRx detection Ending major frame counter counts TxRx detection qualityInformation Major frame count at the end of a Tx misalignment. Number_of_DNF 1 Tx processing qualityInformation The number of major frames containing a DNF flag, which indicates that the major frame was truncated. By default, these partial major frames are removed from processing. TXRX_Slip_Magnitude seconds TxRx detection qualityInformation Average magnitude (and direction) of Tx sawtooth misalignment. 1.7976931348623157e+308 Nested Exit Times seconds since 2018-01-01 TxRx slip auxiliaryInformation Times of up to 4 NestedExit instances. Units are the number of seconds since the ATLAS SDP epoch. Tx Align Confidence 1 TxRx detection qualityInformation Confidence level set by Tx alignment (sawtooth) checks. Per-PCE TOF flags and statistics Beginning major frame counter counts TxRx detection qualityInformation Major frame count at the start of a Tx misalignment. Nested Exit Confidence 1 TxRx detection qualityInformation Confidence level set by nested-exit checks. Histogram Confidence 1 TxRx detection qualityInformation Confidence level set by analysis of TOF histograms. TxRx Slip Flag 1 TxRx detection 0 2 qualityInformation Flag indicating if a TxRx slip condition was detected. not_detected detected 0 1 Too_Few_Tx_in_MFrame 1 Tx processing qualityInformation The number of major frames with less than 199 Tx. The photons associated with these major frames have been discarded from processing. Sawtooth_Period 1/frequency qualityInformation Period of the Tx sawtooth. TxRx detection Ending major frame counter counts TxRx detection qualityInformation Major frame count at the end of a Tx misalignment. Number_of_DNF 1 Tx processing qualityInformation The number of major frames containing a DNF flag, which indicates that the major frame was truncated. By default, these partial major frames are removed from processing. TXRX_Slip_Magnitude seconds TxRx detection qualityInformation Average magnitude (and direction) of Tx sawtooth misalignment. 1.7976931348623157e+308 Nested Exit Times seconds since 2018-01-01 TxRx slip auxiliaryInformation Times of up to 4 NestedExit instances. Units are the number of seconds since the ATLAS SDP epoch. Tx Align Confidence 1 TxRx detection qualityInformation Confidence level set by Tx alignment (sawtooth) checks. Per-PCE TOF flags and statistics Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Number of GPS seconds since the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS Standard Data Product (SDP) epoch. By adding atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch time can be computed. SC time at 1 pps (sec) seconds ATL01/sc referenceInformation SC time at the reception of the last 1PPS signal from the GPSR (seconds since SC epoch: 6-Jan-1980 00:00:00) delta_time SC time at 1 pps (subsec) 100 nanoseconds ATL01/sc referenceInformation Subsecond portion of the SC time at the reception of the last 1PPS signal from the GPSR (seconds since SC epoch: 6-Jan-1980 00:00:00) delta_time ACS time (subsec) 100 nanoseconds ATL01/sc referenceInformation Subsecond portion of the SC time at the initiation of the ACS task (seconds since SC epoch: 6-Jan-1980 00:00:00) (Same time provided within the Attitude/Rate message to ATLAS in RT at 1Hz) delta_time ACS time (sec) seconds ATL01/sc referenceInformation SC time at the initiation of the ACS task (seconds since SC epoch: 6-Jan-1980 00:00:00) (Same time provided within the Attitude/Rate message to ATLAS in RT at 1Hz) delta_time delta_time Group contains the Spacecraft (SC) Ancillary Science packet #1 decommutated data Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation The time tag of the data by using raw_prop_time_sec and subsecs in the L1A ephemeris group, relative to the ATLAS SDP GSP epoch. The ATLAS Standard Data Products (SDP) GPS epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. SC ECI velocity residual Z meters/second ATL01/sc1/ephemeris referenceInformation ACS Orbit Determination Filter velocity of Z frame residual. delta_time SC ECI Velocity Z meters/second ATL01/sc1/ephemeris converted referenceInformation ACS SC Z velocity in the ECI coordinate frame. (Same data that is provided to ATLAS in RT) delta_time SC ECI Position Y meters ATL01/sc1/ephemeris converted referenceInformation ACS SC Y position in the ECI coordinate frame. (Same data that is provided to ATLAS in RT) delta_time SC ECI Velocity Y meters/second ATL01/sc1/ephemeris converted referenceInformation ACS SCY velocity in the ECI coordinate frame. (Same data that is provided to ATLAS in RT) delta_time SC ECI velocity residual X meters/second ATL01/sc1/ephemeris referenceInformation ACS Orbit Determination Filter velocity of X frame residual. delta_time SC ECI Position residual Z meters ATL01/sc1/ephemeris referenceInformation ACS Orbit Determination Filter position of Z frame residual. delta_time SC ECI Position X meters ATL01/sc1/ephemeris converted referenceInformation ACS SC X position in the ECI coordinate frame. (Same data that is provided to ATLAS in RT) delta_time SC ECI Velocity X meters/second ATL01/sc1/ephemeris converted referenceInformation ACS SC X velocity in the ECI coordinate frame. (Same data that is provided to ATLAS in RT) delta_time SC ECI velocity residual Y meters/second ATL01/sc1/ephemeris referenceInformation ACS Orbit Determination Filter velocity of Y frame residual. delta_time SC ECI Position residualY meters ATL01/sc1/ephemeris referenceInformation ACS Orbit Determination Filter position of Y frame residual. delta_time SC ECI Position residual X meters ATL01/sc1/ephemeris referenceInformation ACS Orbit Determination Filter position of X frame residual. delta_time SC ECI Position Z meters ATL01/sc1/ephemeris converted referenceInformation ACS SC Z position in the ECI coordinate frame. (Same data that is provided to ATLAS in RT) delta_time delta_time Contains parameters related to spacecraft Ephemeris Propagator. Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation The time tag of the data computed from raw_acs_time_sec and subseconds in the L1A Attitude_control_ group, relative to the ATLAS SDP epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. SC Inertial to LRS Frame Quaternions 3 counts ATL01/sc1/attitude_control_system and L1B ATBD conversion referenceInformation ACS Spacecraft Inertial frame to Laser Reference System (LRS) reference frame quaternion 3. (Same data provided to ATLAS in RT at 1Hz). delta_time SC Inertial to LRS Frame Quaternions 4 counts ATL01/sc1/attitude_control_system and L1B ATBD conversion referenceInformation ACS Spacecraft Inertial frame to Laser Reference System (LRS) reference frame quaternion4. (Same data provided to ATLAS in RT at 1Hz). delta_time SC Inertial to LRS Frame Quaternions 2 counts ATL01/sc1/attitude_control_system and L1B ATBD conversion referenceInformation ACS Spacecraft Inertial frame to Laser Reference System (LRS) reference frame quaternion 2. (Same data provided to ATLAS in RT at 1Hz). delta_time SC Body Rate (Z) radians/second ATL01/sc1/attitude_control_system and L1B ATBD conversion referenceInformation ACS Fine Rate Estimate - SC Body Z axis. (Same data provided to ATLAS in RT at 1Hz) delta_time ACS Software Mode counts ATL01/sc1/attitude_control_system 0 14 referenceInformation ACS Active ACS Software Mode 0 = Idle 1 = Rate Capture 2 = Sun Acquisition 3 = (Reserved - N/A for ICESat-2) 4 = Slew 5 = Inertial Sun Point 6 = Earth Pointing 7 = ACS Calibration 8 = Inertial Pointing 9 = Reference Ground Track (RGT) 10 = Roll Off-Point (ROP) 11 = Instrument Calibration (ICAL) 12 = DV Wheel Standby 13 = DV Thruster Standby 14 = DV Burn delta_time idle rate_capture sun_acquisition reserved slew inertial_sun_point earth_pointing acs_calibration inertial_pointing reference_ground_track roll_off_point instrument_calibration dv_wheel_standby dv_thruster_standby dv_burn 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 SC Inertial to LRS Frame Quaternions 1 counts ATL01/sc1/attitude_control_system and L1B ATBD conversion referenceInformation ACS Spacecraft Inertial frame to Laser Reference System (LRS) reference frame quaternion1. (Same data provided to ATLAS in RT at 1Hz). delta_time SC Body Rate (Y) radians/second ATL01/sc1/attitude_control_system and L1B ATBD conversion referenceInformation ACS Fine Rate Estimate - SC Body Y axis. (Same data provided to ATLAS in RT at 1Hz) delta_time SC Body Rate (X) radians/second ATL01/sc1/attitude_control_system and L1B ATBD conversion referenceInformation ACS Fine Rate Estimate - SC Body X axis. (Same data provided to ATLAS in RT at 1Hz) delta_time delta_time Contains parameters related to spacecraft ACS (attitude control system) software. Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation SC time at the initiation of the ACS task, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. SADA Azimuth Measured Position (Pot 1) degrees ATL01/sc1/solar_array -100. 100. referenceInformation Solar Array Drive Assembly (SADA) - Estimated Azimuth angle based on Potentiometer 1 (as reported by ACS software). delta_time SADA Azimuth Measured Position (Pot 2) degrees ATL01/sc1/solar_array -100. 100. referenceInformation Solar Array Drive Assembly (SADA) - Estimated Azimuth angle based on Potentiometer 2 (as reported by ACS software). delta_time SADA Azimuth Estimated Position degrees ATL01/sc1/solar_array -100. 100. referenceInformation Solar Array Drive Assembly (SADA) - Estimated Azimuth position used for ACS control delta_time degrees SADA Elevation Measured Position (Pot 1) ATL01/sc1/solar_array -10. 90. referenceInformation Solar Array Drive Assembly (SADA) - Estimated Elevation angle based on Potentiometer 1 (as reported by ACS software). delta_time SADA Elevation Estimated Position degrees ATL01/sc1/solar_array -10. 90. referenceInformation Solar Array Drive Assembly (SADA) - Estimated Elevation position used for ACS control delta_time degrees SADA Elevation Measured Position (Pot 2) ATL01/sc1/solar_array -10. 90. referenceInformation Solar Array Drive Assembly (SADA) - Estimated Elevation angle based on Potentiometer 2 (as reported by ACS software). delta_time delta_time Contains parameters related to solar array driver assembly. Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Time of the Star track subaddress 1 data, relative to the ATLAS SDP GPS Epoch and computed from raw_ace_time_sec/subseconds and etr_delay_tm1. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. ATM Frame Counter counts ATL01/sc2/star_tracker referenceInformation Star Tracker Electronics (STE) [ATM TM#1: Subaddress 13] - External Time Reference (ETR) counter - Used to determine measurement time of reported ATM TLM with respect to SC-provided sync pulse; This item increments upon the reception of the SC-provided sync pulse. delta_time ATM ETR Counter counts ATL01/sc2/star_tracker referenceInformation Star Tracker Electronics (STE) [ATM TM#1: Subaddress 13] - External Time Reference (ETR) delay ticks - Used to determine measurement time of reported ATM TLM with respect to SC-provided sync pulse; Additional delay of quaternion measurement time in ticks of 20 usec from ETR. delta_time counts STE Star Tracker ETR Counter ATL01/sc2/star_tracker referenceInformation Star Tracker Electronics (STE) [Star Tracker Status TM#1: Subaddress 1] - External Time Reference (ETR) counter - Used to determine measurement time of reported STE/OH mode status with respect to SC-provided sync pulse; This item increments upon the reception of the SC-provided sync pulse - Sample 1-10 delta_time 1 STE Star Tracker Mode Status ATL01/sc2/star_tracker 0 15 referenceInformation Star Tracker Electronics (STE) [Star Tracker Status TM#1: Subaddress 1] - Mode Status - Represents the current mode of the STE software . 0 = Initialization 1 = Standby 2 = Memory Read 3 = Memory Write 4 = Self Test 5 = Photo 9 = Angular Rate 10 = Attitude Acquisition 11 = Attitude Tracking 14 = AOM/Attitude Acquisition Phase 15 = AOM/Attitude Tracking Phase All other values invalid delta_time init stby mem_read mem_write self_test photon angular_rate att_acq att_track aom_acq aom_track 0 1 2 3 4 5 9 10 11 14 15 delta_time Data within this group are stored at the data rate of the source Star Tracker data within the Spacecraft Ancillary Science Data Packets. (nominally ten per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Elapsed GPS seconds since the ATLAS SDP GPS Epoch, computed from raw_ace_time_sec and subseconds and atm_etr_delay_tm7. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. STOH Attitude Quality (X) arcsec ATL01/sc2/star_tracker/optical_head_1 converted referenceInformation Star Tracker Optical Head (STOH) Quality measurement of STOH computed quaternion (X) delta_time ATM ETR Counter counts ATL01/sc2/star_tracker/optical_head_1 referenceInformation Star Tracker Optical Head (STOH) 1 [ATM TM#7: Subaddress 19] - External Time Reference (ETR) counter - Used to determine measurement time of reported quaternions with respect to SC- provided sync pulse; This item increments upon the reception of the SC-provided sync pulse. delta_time STOH Attitude Quality (Z) arcsec ATL01/sc2/star_tracker/optical_head_1 converted referenceInformation Star Tracker Optical Head (STOH) Quality measurement of STOH computed quaternion (Z) delta_time 127 Sequencing Mode Status counts ATL01/sc2/star_tracker/optical_head_1 0 7 referenceInformation Star Tracker Optical Head (STOH) [Star Tracker Status TM#1: Subaddress 1] - Sequencing (Mode) Status delta_time off standby photo acquire track autotest win_acq powered 0 1 2 3 4 5 6 7 STOH1 ATM Frame Counter counts ATL01/sc2/star_tracker/optical_head_1 referenceInformation Star Tracker Optical Head (STOH) 1 [ATM TM#7: Subaddress 19] - Frame Counter delta_time STOH1 Quaternion3 counts ATL01/sc2/star_tracker/optical_head_1 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 3 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time STOH Attitude Quality (Y) arcsec ATL01/sc2/star_tracker/optical_head_1 converted referenceInformation Star Tracker Optical Head (STOH) Quality measurement of STOH computed quaternion (Y) delta_time STOH1 Quaternion1 counts ATL01/sc2/star_tracker/optical_head_1 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 1 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time STOH1 Quaternion4 counts ATL01/sc2/star_tracker/optical_head_1 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 4 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time STOH1 Quaternion2 counts ATL01/sc2/star_tracker/optical_head_1 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 2 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time 127 STOHx Number of Coherent Stars counts ATL01/sc2/star_tracker/optical_head_1 referenceInformation Star Tracker Electronics (STE) [ATM TM#1: Subaddress 13] - Number of coherent stars used in STOH attitude calculation. delta_time delta_time Contains parameters related to spacecraft Star Tracker Optical Head 1 (STOH1). Data within this group are stored at the data rate of the source Star Tracker data within the Spacecraft Ancillary Science Data Packets. (nominally ten per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation Elapsed GPS seconds from the ATLAS SDP GPS Epoch, computed from raw_ace_time_sec and subseconds and atm_etr_delay_tm8. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. STOH Attitude Quality (X) arcsec ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) Quality measurement of STOH computed quaternion (X) delta_time ATM ETR Counter counts ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) 2 [ATM TM#8: Subaddress 20] - External Time Reference (ETR) counter - Used to determine measurement time of reported quaternions with respect to SC- provided sync pulse; This item increments upon the reception of the SC-provided sync pulse delta_time STOH Attitude Quality (Z) arcsec ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) Quality measurement of STOH computed quaternion (Z) delta_time 127 Sequencing Mode Status counts ATL01/sc2/star_tracker/optical_head_2 0 7 referenceInformation Star Tracker Optical Head (STOH) [Star Tracker Status TM#1: Subaddress 1] - Sequencing (Mode) Status. A value of 127 indicates that the data could not be filled from the vc5 packets. delta_time off standby photo acquire track autotest win_acq powered 0 1 2 3 4 5 6 7 STOH2 ATM Frame Counter counts ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) 2 [ATM TM#8: Subaddress 20] - Frame Counter delta_time STOH1 Quaternion3 counts ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 3 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time STOH Attitude Quality (Y) arcsec ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) Quality measurement of STOH computed quaternion (Y) delta_time STOH1 Quaternion1 counts ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 1 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time STOH1 Quaternion4 counts ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 4 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time STOH1 Quaternion2 counts ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Optical Head (STOH) [ATM TM#7: Subaddress 19] - Attitude quaternion 2 - STOH reference frame to Earth-Centered Inertial (ECI) reference frame delta_time 127 STOHx Number of Coherent Stars counts ATL01/sc2/star_tracker/optical_head_2 referenceInformation Star Tracker Electronics (STE) [ATM TM#1: Subaddress 13] - Number of coherent stars used in STOH attitude calculation delta_time delta_time Contains parameters related to spacecraft Star Tracker Optical Head 2 (STOH2). Data within this group are stored at the data rate of the source Star Tracker data within the Spacecraft Ancillary Science Data Packets. (nominally ten per second.) Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation IMU delta time tag at the end of the IDL frame over which the integrated gyro angle data was collected, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. IMU Sync Event Time Tag seconds ATL01/sc1/inertial_measurement_unit/hi_rate converted referenceInformation IMU Time remaining on the countdown timer which triggers the IDL interrupt (between the event strobe and the timetag of the next IDL data packet). IMU time at the reception of the last IMU time sync pulse. This word contains the time stamp that is recorded when the Event Strobe input to the SSIRU transitions to the active (low) state. delta_time delta_time Contains parameters related to spacecraft IMU (Inertial Measurement Unit). Data within this main group are stored at the data rate of the source IMU within the Spacecraft Ancillary Science Data Packet. (nominally fifty per second.) IMU Gyro Integrated Angle Counter (Gyros A, B, C, D) arcseconds ATL01/sc1/inertial_measurement_unit/hi_rate converted referenceInformation IMU integrated angle sensed by the SSIRU Gyro. The data word shall increment from 0 to full scale (0xFFFF) and roll over to zero for positive input rates about the Gyro input axis. The data word shall decrement from full scale to 0 and roll over to 0xFFFF for negative input rates about the Gyro input axis. ../delta_time IMU Gyro Rate Valid (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro Integrated Angular Rate data validity status. 0=invalid, 1=valid. ../delta_time invalid valid 0 1 IMU Gyro Saturation Bit (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro saturation mode: Force to Rebalance (FTR) Mode (The gyro operates in this mode during low inertial rates) or Whole Angle Saturation (WAS) Mode (The gyro operates in this mode during high inertial rates). ../delta_time ftr_mode was_mode 0 1 IMU Gyro Scaling Factor (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro scale factor mode: low scaling factor mode with the corresponding Integrated Angle word being 0.05 arc-sec/LSB or high scaling factor with the corresponding Integrated Angle word being 1.6 arc-sec/LSB. ../delta_time low_scale_factor high_scale_factor 0 1 Contains parameters related to spacecraft IMU (Inertial Measurement Unit) gyros. Data within this main group are stored at the data rate of the source IMU high_rate data within the Spacecraft Ancillary Science Data Packet. (nominally fifty per second.) IMU Gyro Integrated Angle Counter (Gyros A, B, C, D) arcseconds ATL01/sc1/inertial_measurement_unit/hi_rate converted referenceInformation IMU integrated angle sensed by the SSIRU Gyro. The data word shall increment from 0 to full scale (0xFFFF) and roll over to zero for positive input rates about the Gyro input axis. The data word shall decrement from full scale to 0 and roll over to 0xFFFF for negative input rates about the Gyro input axis. ../delta_time IMU Gyro Rate Valid (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro Integrated Angular Rate data validity status. 0=invalid, 1=valid. ../delta_time invalid valid 0 1 IMU Gyro Saturation Bit (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro saturation mode: Force to Rebalance (FTR) Mode (The gyro operates in this mode during low inertial rates) or Whole Angle Saturation (WAS) Mode (The gyro operates in this mode during high inertial rates). ../delta_time ftr_mode was_mode 0 1 IMU Gyro Scaling Factor (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro scale factor mode: low scaling factor mode with the corresponding Integrated Angle word being 0.05 arc-sec/LSB or high scaling factor with the corresponding Integrated Angle word being 1.6 arc-sec/LSB. ../delta_time low_scale_factor high_scale_factor 0 1 Contains parameters related to spacecraft IMU (Inertial Measurement Unit) gyros. Data within this main group are stored at the data rate of the source IMU high_rate data within the Spacecraft Ancillary Science Data Packet. (nominally fifty per second.) IMU Gyro Integrated Angle Counter (Gyros A, B, C, D) arcseconds ATL01/sc1/inertial_measurement_unit/hi_rate converted referenceInformation IMU integrated angle sensed by the SSIRU Gyro. The data word shall increment from 0 to full scale (0xFFFF) and roll over to zero for positive input rates about the Gyro input axis. The data word shall decrement from full scale to 0 and roll over to 0xFFFF for negative input rates about the Gyro input axis. ../delta_time IMU Gyro Rate Valid (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro Integrated Angular Rate data validity status. 0=invalid, 1=valid. ../delta_time invalid valid 0 1 IMU Gyro Saturation Bit (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro saturation mode: Force to Rebalance (FTR) Mode (The gyro operates in this mode during low inertial rates) or Whole Angle Saturation (WAS) Mode (The gyro operates in this mode during high inertial rates). ../delta_time ftr_mode was_mode 0 1 IMU Gyro Scaling Factor (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro scale factor mode: low scaling factor mode with the corresponding Integrated Angle word being 0.05 arc-sec/LSB or high scaling factor with the corresponding Integrated Angle word being 1.6 arc-sec/LSB. ../delta_time low_scale_factor high_scale_factor 0 1 Contains parameters related to spacecraft IMU (Inertial Measurement Unit) gyros. Data within this main group are stored at the data rate of the source IMU high_rate data within the Spacecraft Ancillary Science Data Packet. (nominally fifty per second.) IMU Gyro Integrated Angle Counter (Gyros A, B, C, D) arcseconds ATL01/sc1/inertial_measurement_unit/hi_rate converted referenceInformation IMU integrated angle sensed by the SSIRU Gyro. The data word shall increment from 0 to full scale (0xFFFF) and roll over to zero for positive input rates about the Gyro input axis. The data word shall decrement from full scale to 0 and roll over to 0xFFFF for negative input rates about the Gyro input axis. ../delta_time IMU Gyro Rate Valid (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro Integrated Angular Rate data validity status. 0=invalid, 1=valid. ../delta_time invalid valid 0 1 IMU Gyro Saturation Bit (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro saturation mode: Force to Rebalance (FTR) Mode (The gyro operates in this mode during low inertial rates) or Whole Angle Saturation (WAS) Mode (The gyro operates in this mode during high inertial rates). ../delta_time ftr_mode was_mode 0 1 IMU Gyro Scaling Factor (Gyros A, B, C, D) 1 ATL01/sc1/inertial_measurement_unit/hi_rate 0 1 referenceInformation IMU Gyro scale factor mode: low scaling factor mode with the corresponding Integrated Angle word being 0.05 arc-sec/LSB or high scaling factor with the corresponding Integrated Angle word being 1.6 arc-sec/LSB. ../delta_time low_scale_factor high_scale_factor 0 1 Contains parameters related to spacecraft IMU (Inertial Measurement Unit) gyros. Data within this main group are stored at the data rate of the source IMU high_rate data within the Spacecraft Ancillary Science Data Packet. (nominally fifty per second.) Dimension scale for Side A or B 1 Dimension Scale referenceInformation Dimension scale for Side A or B side_a side_b 1 2 Dimension scale for flexure thermistors 1 Dimension Scale referenceInformation Dimension scale for flexure thermistor temperatures. Elapsed GPS seconds time seconds since 2018-01-01 Derived via Time Tagging referenceInformation The derived time tag of the data, relative to the ATLAS SDP GPS Epoch. The ATLAS Standard Data Products (SDP) epoch offset is defined within /ancillary_data/atlas_sdp_gps_epoch as the number of GPS seconds between the GPS epoch (1980-01-06T00:00:00.000000Z UTC) and the ATLAS SDP epoch. By adding the offset contained within atlas_sdp_gps_epoch to delta time parameters, the time in gps_seconds relative to the GPS epoch can be computed. Dimension scale for ATLAS Temperatures 1 Dimension Scale referenceInformation Dimension scale for ATLAS temperatures. ATLAS Switch Status - Survival Heater 4 (Sides A, B) 1 ATL01/sc1/hk 0 1 referenceInformation ATLAS Survival Heater 4 power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 ATLAS Currents - Detector Power (Sides A, B) amps ATL01/sc1/hk converted referenceInformation ATLAS Detector power feed current measured by the SC PDU (7.5A; Sides A, B) delta_time Solar Array Panel 1 (Inboard) Back-Side Temperature degreesC ATL01/sc1/hk converted referenceInformation SC Monitored Temperature of the Back-Side of Solar Panel 1 (Inboard Panel) delta_time Solar Array Panel 4 (Outboard) Back- Side Temperature degreesC ATL01/sc1/hk converted referenceInformation SC Monitored Temperature of the Back-Side of Solar Panel 4 (Outboard Panel) delta_time ATLAS Currents - Survival Heater 2 (Sides A, B) amps ATL01/sc1/hk converted referenceInformation ATLAS Survival Heater 2 power feed current measured by the SC PDU (10A; Sides A, B) delta_time ATLAS Switch Status - LHP Shutdown HTR (Sides A, B) 1 ATL01/sc1/hk 0 1 referenceInformation ATLAS LHP Shutdown Heater power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 ATLAS Switch Status - Survival Heater 1 (Sides A, B) 1 ATL01/sc1/hk referenceInformation ATLAS Survival Heater 1 power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 ATLAS Switch Status - Detector (Sides A, B) 1 ATL01/sc1/hk 0 1 referenceInformation ATLAS Detector power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 ATLAS Currents - Laser A amps ATL01/sc1/hk converted referenceInformation ATLAS Laser A power feed current measured by the SC PDU (20A) delta_time Solar Array Panel 1 (Inboard) Cell-Side Temp degreesC ATL01/sc1/hk converted referenceInformation SC Monitored Temperature of the Cell-Side of Solar Panel 1 (Inboard Panel) delta_time ATLAS Switch Status - Survival Heater 3 (Sides A, B) 1 ATL01/sc1/hk 0 1 referenceInformation ATLAS Survival Heater 3 power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 Solar Array Panel 4 (Outboard) Cell- Side Temperature degreesC ATL01/sc1/hk converted referenceInformation SC Monitored Temperature of the Cell-Side of Solar Panel 4 (Outboard Panel) delta_time SC Essential Bus Voltage (Sides A, B) volts ATL01/sc1/hk converted referenceInformation SC Essential Bus Voltage measured by the SC PDU. (Sides A, B) delta_time ATLAS Switch Status - Laser (Sides A, B) 1 ATL01/sc1/hk 0 1 referenceInformation ATLAS Laser power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 ATLAS Currents - LHP Shutdown HTR (Sides A, B) amps ATL01/sc1/hk converted referenceInformation ATLAS Loop Heat Pipe Shutdown power feed current measured by the SC PDU (7.5A; Sides A, B) delta_time ATLAS Switch Status - Main (Sides A, B) 1 ATL01/sc1/hk 0 1 referenceInformation ATLAS Main power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 ATLAS Switch Status - Survival Heater 2 (Sides A, B) 1 ATL01/sc1/hk 0 1 referenceInformation ATLAS Survival Heater 2 power feed status measured by the SC PDU (Sides A, B) delta_time on off 0 1 ATLAS Currents - Survival Heater 1 (Sides A, B) amps ATL01/sc1/hk converted referenceInformation ATLAS Survival Heater 1 power feed current measured by the SC PDU (10A; Sides A, B) delta_time amps ATLAS Currents - Survival Heater 4 (Sides A, B) ATL01/sc1/hk converted referenceInformation ATLAS Survival Heater 4 power feed current measured by the SC PDU (10A; Sides A, B) delta_time SC-to-ATLAS Flexure Temperature degreesC ATL01/sc1/hk converted referenceInformation SC Monitored Temperature of Mechanical I/F Flexure 1, 2 and 3 delta_time amps ATLAS Currents - Survival Heater 3 (Sides A, B) ATL01/sc1/hk converted referenceInformation ATLAS Survival Heater 3 power feed current measured by the SC PDU (10A; Sides A, B) delta_time ATLAS Temperatures (1-15) degreesC ATL01/sc1/hk converted referenceInformation SC Monitored ATLAS Temperatures (1 to 15) delta_time ATLAS Currents - ATLAS Main (Sides A, B) amps ATL01/sc1/hk converted referenceInformation ATLAS Main power feed current measured by the SC PDU (20A; Sides A, B) delta_time delta_time ds_ab_index ds_flexure_index ds_temp_index Contains parameters related to spacecraft housekeeping data. Data within this group are stored at the data rate of the source Spacecraft Ancillary Science Data Packets. (nominally one per second.) 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NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo> <gmd:CI_Contact id="NSIDC_DAAC_CONTACT_ID"> <gmd:phone> <gmd:CI_Telephone> <gmd:voice> <gco:CharacterString>303-492-6199</gco:CharacterString> </gmd:voice> <gmd:facsimile> <gco:CharacterString>303-492-2468</gco:CharacterString> </gmd:facsimile> </gmd:CI_Telephone> </gmd:phone> <gmd:address> <gmd:CI_Address> <gmd:deliveryPoint> <gco:CharacterString>1540 30th St Campus Box 449</gco:CharacterString> </gmd:deliveryPoint> <gmd:city> <gco:CharacterString>Boulder</gco:CharacterString> </gmd:city> <gmd:administrativeArea> <gco:CharacterString>Colorado</gco:CharacterString> </gmd:administrativeArea> <gmd:postalCode> <gco:CharacterString>80309-0449</gco:CharacterString> </gmd:postalCode> <gmd:country> <gco:CharacterString>USA</gco:CharacterString> </gmd:country> <gmd:electronicMailAddress> <gco:CharacterString>nsidc@nsidc.org</gco:CharacterString> </gmd:electronicMailAddress> </gmd:CI_Address> </gmd:address> <gmd:onlineResource> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://nsidc.org/daac/</gmd:URL> </gmd:linkage> </gmd:CI_OnlineResource> </gmd:onlineResource> <gmd:hoursOfService> <gco:CharacterString>9:00 A.M. to 5:00 P.M., U.S. Mountain Time, Monday through Friday, excluding U.S. holidays.</gco:CharacterString> </gmd:hoursOfService> <gmd:contactInstructions> <gco:CharacterString>Contact by e-mail first</gco:CharacterString> </gmd:contactInstructions> </gmd:CI_Contact> </gmd:contactInfo> <gmd:role> <gmd:CI_RoleCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="pointOfContact">pointOfContact</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:contact> <gmd:dateStamp> <gco:Date>2015-10-15</gco:Date> </gmd:dateStamp> <gmd:metadataStandardName> <gco:CharacterString>ISO 19115-2 Geographic information - Metadata - Part 2: Extensions for imagery and gridded data</gco:CharacterString> </gmd:metadataStandardName> <gmd:metadataStandardVersion> <gco:CharacterString>ISO 19115-2:2009(E)</gco:CharacterString> </gmd:metadataStandardVersion> <gmd:identificationInfo> <gmd:MD_DataIdentification> <gmd:citation> <gmd:CI_Citation> <!-- ECS extracts the LongName from here --> <!-- UMM-C expects the ShortName to precede the LongName separated by a &gt; here --> <gmd:title> <gco:CharacterString>ATLAS/ICESat-2 L1B Converted Telemetry Data</gco:CharacterString> </gmd:title> <gmd:date> <gmd:CI_Date> <!-- ECS extracts the RevisionDate from here --> <gmd:date> <gco:Date>2022-08-09</gco:Date> </gmd:date> <gmd:dateType> <gmd:CI_DateTypeCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_DateTypeCode" codeListValue="revision">revision</gmd:CI_DateTypeCode> </gmd:dateType> </gmd:CI_Date> </gmd:date> <!-- VersionID is expected to be here by the Base Reference Metadata Model document --> <gmd:edition> <gco:CharacterString>006</gco:CharacterString> </gmd:edition> <gmd:identifier> <gmd:MD_Identifier> <!-- ECS extracts the ShortName from here --> <gmd:code> <gco:CharacterString>ATL02</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>The ECS Short Name</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:identifier> <gmd:MD_Identifier> <!-- ECS extracts the VersionID from here --> <gmd:code> <gco:CharacterString>006</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>The ECS Version ID</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:identifier> <gmd:MD_Identifier> <!-- This field provides the Digital Object Identifier (DOI). --> <gmd:code> <gmx:Anchor xlink:actuate="onRequest" xlink:href="http://dx.doi.org/10.5067/ATLAS/ATL02.006">doi:10.5067/ATLAS/ATL02.006</gmx:Anchor> </gmd:code> <gmd:codeSpace> <gco:CharacterString>gov.nasa.esdis</gco:CharacterString> </gmd:codeSpace> <gmd:description> <gco:CharacterString>A Digital Object Identifier (DOI)</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmd:identifier> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty> <gmd:organisationName> <gco:CharacterString>National Aeronautics and Space Administration (NASA)</gco:CharacterString> </gmd:organisationName> <gmd:role> <gmd:CI_RoleCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="resourceProvider">resourceProvider</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty> <!-- ECS expects ProcessingCenter to be here --> <gmd:organisationName> <gco:CharacterString>GSFC I-SIPS &gt; ICESat-2 Science Investigator-led Processing System</gco:CharacterString> </gmd:organisationName> <gmd:role> <gmd:CI_RoleCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="originator">originator</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> <!-- ECS extracts the VersionDescription from here --> <gmd:otherCitationDetails> <gco:CharacterString>Initial version of the processing software</gco:CharacterString> </gmd:otherCitationDetails> </gmd:CI_Citation> </gmd:citation> <!-- ECS extracts the CollectionDescription from here --> <gmd:abstract> <gco:CharacterString>ATL02 Science unit converted time ordered telemetry calibrated for instrument effects. All photon events per beam per shot. Includes atmosphere raw profiles, housekeeping data, engineering data, s/c position, and pointing data.</gco:CharacterString> </gmd:abstract> <gmd:purpose> <gco:CharacterString>The purpose of ATL02 is to provide science-unit, calibrated data for upstream processing. Data converted from raw counts to science units, calibrated for instrument effects and precisely time-tagged. ATL02 provides the position and pointing data needed to precisely geolocate each photon. ATL02 is of limited use to the science community.</gco:CharacterString> </gmd:purpose> <gmd:credit> <gco:CharacterString>The software that generates the ATL02 product was designed and implemented at the NASA Wallops Flight Facility in Wallops Island, Virginia.</gco:CharacterString> </gmd:credit> <gmd:status> <gmd:MD_ProgressCode codeList="http://www.isotc211.org/2005/resources/Codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="onGoing">onGoing</gmd:MD_ProgressCode> </gmd:status> <gmd:pointOfContact> <gmd:CI_ResponsibleParty> <!-- ECS expects ArchiveCenter to be here --> <gmd:organisationName> <gco:CharacterString>NSIDC DAAC &gt; NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo xlink:href="#NSIDC_DAAC_CONTACT_ID"/> <gmd:role> <gmd:CI_RoleCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="distributor">distributor</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:pointOfContact> <gmd:resourceFormat> <gmd:MD_Format> <gmd:name> <gco:CharacterString>HDF</gco:CharacterString> </gmd:name> <gmd:version> <gco:CharacterString>5</gco:CharacterString> </gmd:version> </gmd:MD_Format> </gmd:resourceFormat> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>EARTH SCIENCE &gt; SPECTRAL/ENGINEERING &gt; INFRARED WAVELENGTHS &gt; SENSOR COUNTS &gt; NONE &gt; NONE &gt; Photons</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="theme">theme</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Science Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty id="GCMD_USO_ID"> <gmd:organisationName> <gco:CharacterString>NASA Global Change Master Directory (GCMD) User Support Office</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo> <gmd:CI_Contact> <gmd:phone gco:nilReason="missing"/> <gmd:address> <gmd:CI_Address> <gmd:deliveryPoint> <gco:CharacterString>NASA Global Change Master Directory, Goddard Space Flight Center</gco:CharacterString> </gmd:deliveryPoint> <gmd:city> <gco:CharacterString>Greenbelt</gco:CharacterString> </gmd:city> <gmd:administrativeArea> <gco:CharacterString>MD</gco:CharacterString> </gmd:administrativeArea> <gmd:postalCode> <gco:CharacterString>20771</gco:CharacterString> </gmd:postalCode> <gmd:country> <gco:CharacterString>USA</gco:CharacterString> </gmd:country> <gmd:electronicMailAddress> <gco:CharacterString>gcmduso@gcmd.gsfc.nasa.gov</gco:CharacterString> </gmd:electronicMailAddress> </gmd:CI_Address> </gmd:address> <gmd:onlineResource> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://gcmd.nasa.gov/</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:applicationProfile> <gco:CharacterString>web browser</gco:CharacterString> </gmd:applicationProfile> <gmd:name> <gco:CharacterString>NASA Global Change Master Directory (GCMD)</gco:CharacterString> </gmd:name> <gmd:description> <gco:CharacterString>Home Page</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onlineResource> <gmd:contactInstructions> <gco:CharacterString>http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso</gco:CharacterString> </gmd:contactInstructions> </gmd:CI_Contact> </gmd:contactInfo> <gmd:role> <gmd:CI_RoleCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="custodian">custodian</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> <gmd:citedResponsibleParty> <gmd:CI_ResponsibleParty id="GCMD_KEYWORDS_ID"> <gmd:organisationName> <gco:CharacterString>Global Change Master Directory (GCMD)</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo> <gmd:CI_Contact> <gmd:phone gco:nilReason="missing"/> <gmd:address> <gmd:CI_Address> <gmd:deliveryPoint> <gco:CharacterString>NASA Global Change Master Directory, Goddard Space Flight Center</gco:CharacterString> </gmd:deliveryPoint> <gmd:city> <gco:CharacterString>Greenbelt</gco:CharacterString> </gmd:city> <gmd:administrativeArea> <gco:CharacterString>MD</gco:CharacterString> </gmd:administrativeArea> <gmd:postalCode> <gco:CharacterString>20771</gco:CharacterString> </gmd:postalCode> <gmd:country> <gco:CharacterString>USA</gco:CharacterString> </gmd:country> <gmd:electronicMailAddress> <gco:CharacterString>gcmduso@gcmd.gsfc.nasa.gov</gco:CharacterString> </gmd:electronicMailAddress> </gmd:CI_Address> </gmd:address> <gmd:onlineResource> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://gcmd.nasa.gov/Resources/valids/</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:applicationProfile> <gco:CharacterString>web browser</gco:CharacterString> </gmd:applicationProfile> <gmd:name> <gco:CharacterString>NASA Global Change Master Directory (GCMD) Keyword Page</gco:CharacterString> </gmd:name> <gmd:description> <gco:CharacterString>This page describes the NASA GCMD Keywords, how to reference those keywords and provides download instructions.</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="download">download</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onlineResource> <gmd:contactInstructions> <gco:CharacterString>http://gcmd.nasa.gov/MailComments/MailComments.jsf?rcpt=gcmduso</gco:CharacterString> </gmd:contactInstructions> </gmd:CI_Contact> </gmd:contactInfo> <gmd:role> <gmd:CI_RoleCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="custodian">custodian</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:citedResponsibleParty> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>GEOGRAPHIC REGION &gt; GLOBAL</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="place">place</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Location Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> <gmd:citedResponsibleParty xlink:href="#GCMD_USO_ID"/> <gmd:citedResponsibleParty xlink:href="#GCMD_KEYWORDS_ID"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>NASA/NSIDC_DAAC &gt; NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="dataCenter">dataCenter</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Data Center Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> <gmd:citedResponsibleParty xlink:href="#GCMD_USO_ID"/> <gmd:citedResponsibleParty xlink:href="#GCMD_KEYWORDS_ID"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>Earth Observation Satellites &gt; NASA Decadal Survey &gt; ICESAT-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="platform">platform</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Platform Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> <gmd:citedResponsibleParty xlink:href="#GCMD_USO_ID"/> <gmd:citedResponsibleParty xlink:href="#GCMD_KEYWORDS_ID"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:descriptiveKeywords> <gmd:MD_Keywords> <gmd:keyword> <gco:CharacterString>Earth Remote Sensing Instruments &gt; Active Remote Sensing &gt; Altimeters &gt; Lidar/Laser Altimeters &gt; ATLAS &gt; Advanced Topographic Laser Altimeter System</gco:CharacterString> </gmd:keyword> <gmd:type> <gmd:MD_KeywordTypeCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_KeywordTypeCode" codeListValue="instrument">instrument</gmd:MD_KeywordTypeCode> </gmd:type> <gmd:thesaurusName> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>NASA/GCMD Instrument Keywords</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> <gmd:citedResponsibleParty xlink:href="#GCMD_USO_ID"/> <gmd:citedResponsibleParty xlink:href="#GCMD_KEYWORDS_ID"/> </gmd:CI_Citation> </gmd:thesaurusName> </gmd:MD_Keywords> </gmd:descriptiveKeywords> <gmd:resourceConstraints> <gmd:MD_Constraints> <gmd:useLimitation> <gco:CharacterString>Cite these data in publications as follows: The data used in this study were produced by the ICESat-2 Science Project Office at NASA/GSFC. The data archive site is the NASA National Snow and Ice Data Center Distributed Active Archive Center.</gco:CharacterString> </gmd:useLimitation> </gmd:MD_Constraints> </gmd:resourceConstraints> <gmd:language> <gco:CharacterString>eng</gco:CharacterString> </gmd:language> <gmd:topicCategory> <gmd:MD_TopicCategoryCode>geoscientificInformation</gmd:MD_TopicCategoryCode> </gmd:topicCategory> <gmd:extent> <gmd:EX_Extent> <gmd:geographicElement> <gmd:EX_GeographicBoundingBox> <!-- ECS extracts WestBoundingCoordinate from here --> <gmd:westBoundLongitude> <gco:Decimal>-180.0</gco:Decimal> </gmd:westBoundLongitude> <!-- ECS extracts EastBoundingCoordinate from here --> <gmd:eastBoundLongitude> <gco:Decimal>180.0</gco:Decimal> </gmd:eastBoundLongitude> <!-- ECS extracts SouthBoundingCoordinate from here --> <gmd:southBoundLatitude> <gco:Decimal>-90.0</gco:Decimal> </gmd:southBoundLatitude> <!-- ECS extracts NorthBoundingCoordinate from here --> <gmd:northBoundLatitude> <gco:Decimal>90.0</gco:Decimal> </gmd:northBoundLatitude> </gmd:EX_GeographicBoundingBox> </gmd:geographicElement> <gmd:temporalElement> <gmd:EX_TemporalExtent> <gmd:extent> <gml:TimePeriod gml:id="TimePeriod_ID_1"> <!-- ECS extracts RangeBeginningDate and RangeBeginningTime from here --> <gml:beginPosition>2005-01-01T00:00:00Z</gml:beginPosition> <!-- ECS extracts RangeEndingDate and RangeEndingTime from here --> <gml:endPosition></gml:endPosition> </gml:TimePeriod> </gmd:extent> </gmd:EX_TemporalExtent> </gmd:temporalElement> </gmd:EX_Extent> </gmd:extent> <gmd:processingLevel> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>1B</gco:CharacterString> </gmd:code> <gmd:description gco:nilReason="missing"/> </gmd:MD_Identifier> </gmd:processingLevel> </gmd:MD_DataIdentification> </gmd:identificationInfo> <gmd:contentInfo> <gmd:MD_ImageDescription> <gmd:attributeDescription gco:nilReason="missing"/> <gmd:contentType gco:nilReason="missing"/> <gmd:processingLevelCode> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>1B</gco:CharacterString> </gmd:code> <gmd:description gco:nilReason="missing"/> </gmd:MD_Identifier> </gmd:processingLevelCode> </gmd:MD_ImageDescription> </gmd:contentInfo> <gmd:distributionInfo> <gmd:MD_Distribution> <gmd:distributionFormat> <gmd:MD_Format> <gmd:name> <gco:CharacterString>HDF</gco:CharacterString> </gmd:name> <gmd:version> <gco:CharacterString>5</gco:CharacterString> </gmd:version> </gmd:MD_Format> </gmd:distributionFormat> <gmd:distributor> <gmd:MD_Distributor> <gmd:distributorContact> <gmd:CI_ResponsibleParty> <gmd:organisationName> <gco:CharacterString>NSIDC DAAC &gt; NASA National Snow and Ice Data Center Distributed Active Archive Center</gco:CharacterString> </gmd:organisationName> <gmd:contactInfo xlink:href="#NSIDC_DAAC_CONTACT_ID"/> <gmd:role> <gmd:CI_RoleCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_RoleCode" codeListValue="distributor">distributor</gmd:CI_RoleCode> </gmd:role> </gmd:CI_ResponsibleParty> </gmd:distributorContact> <gmd:distributorTransferOptions> <gmd:MD_DigitalTransferOptions> <gmd:onLine> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://nsidc.org/data/icesat2/data.html</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:description> <gco:CharacterString>Data Product Description Page</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onLine> <gmd:onLine> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://nsidc.org/data/icesat2/order.html</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:description> <gco:CharacterString>Data Product Order Page</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="order">order</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onLine> <gmd:onLine> <gmd:CI_OnlineResource> <gmd:linkage> <gmd:URL>http://dx.doi.org/10.5067/ATLAS/ATL02.006</gmd:URL> </gmd:linkage> <gmd:protocol> <gco:CharacterString>http</gco:CharacterString> </gmd:protocol> <gmd:description> <gco:CharacterString>Digital Object Identifier URL</gco:CharacterString> </gmd:description> <gmd:function> <gmd:CI_OnLineFunctionCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#CI_OnLineFunctionCode" codeListValue="information">information</gmd:CI_OnLineFunctionCode> </gmd:function> </gmd:CI_OnlineResource> </gmd:onLine> </gmd:MD_DigitalTransferOptions> </gmd:distributorTransferOptions> </gmd:MD_Distributor> </gmd:distributor> </gmd:MD_Distribution> </gmd:distributionInfo> <gmi:acquisitionInformation> <gmi:MI_AcquisitionInformation> <gmi:instrument> <eos:EOS_Instrument id="ATLAS_INSTRUMENT_ID"> <gmi:citation> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ATLAS &gt; Advanced Topographic Laser Altimeter System</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> </gmd:CI_Citation> </gmi:citation> <gmi:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ATLAS</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>Advanced Topographic Laser Altimeter System</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmi:identifier> <gmi:type> <gco:CharacterString>Laser Altimeter</gco:CharacterString> </gmi:type> <gmi:description> <gco:CharacterString>ATLAS on ICESat-2 determines the range between the satellite and the Earth's surface by measuring the two-way time delay of short pulses of laser light that it transmits in six beams. It is different from previous operational ice-sheet altimeters in that it is a photon-counting LIDAR. ATLAS records a set of arrival times for individual photons, which are then analyzed to derive surface, vegetation, and cloud properties. ATLAS has six beams arranged in three pairs, so that it samples each of three reference pair tracks with a pair of beams; ATLAS transmits pulses at 10 kHz, giving approximately one pulse every 0.7 m along track; ATLAS's expected pointing control will be better than 90 m RMS.</gco:CharacterString> </gmi:description> <gmi:mountedOn xlink:href="#ICESAT_2_PLATFORM_ID"/> </eos:EOS_Instrument> </gmi:instrument> <gmi:operation> <!-- MI_Operation is expected to be here by the Base Reference Metadata Model document--> <gmi:MI_Operation> <gmi:description> <gco:CharacterString>ICESat-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmi:description> <gmi:citation> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ICESat-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> </gmd:CI_Citation> </gmi:citation> <gmi:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ICESat-2</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmi:identifier> <gmi:status> <gmd:MD_ProgressCode codeList="http://cdn.earthdata.nasa.gov/iso/resources/Codelist/gmxCodelists.xml#MD_ProgressCode" codeListValue="underDevelopment">underDevelopment</gmd:MD_ProgressCode> </gmi:status> <gmi:parentOperation gco:nilReason="inapplicable"/> <gmi:platform xlink:href="#ICESAT_2_PLATFORM_ID"/> </gmi:MI_Operation> </gmi:operation> <gmi:platform> <eos:EOS_Platform id="ICESAT_2_PLATFORM_ID"> <gmi:citation> <gmd:CI_Citation> <gmd:title> <gco:CharacterString>ICESat-2 &gt; Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:title> <gmd:date gco:nilReason="unknown"/> </gmd:CI_Citation> </gmi:citation> <gmi:identifier> <gmd:MD_Identifier> <gmd:code> <gco:CharacterString>ICESat-2</gco:CharacterString> </gmd:code> <gmd:description> <gco:CharacterString>Ice, Cloud, and land Elevation Satellite-2</gco:CharacterString> </gmd:description> </gmd:MD_Identifier> </gmi:identifier> <gmi:description> <gco:CharacterString>Spacecraft</gco:CharacterString> </gmi:description> <gmi:instrument xlink:href="#ATLAS_INSTRUMENT_ID"/> </eos:EOS_Platform> </gmi:platform> </gmi:MI_AcquisitionInformation> </gmi:acquisitionInformation> </gmi:MI_Metadata> </gmd:seriesMetadata> </gmd:DS_Series> 10000 pps 532 nm ATLAS Laser Altimeter ATLAS on ICESat-2 determines the range between the satellite and the Earth's surface by measuring the two-way time delay of short pulses of laser light that it transmits in six beams. It is different from previous operational ice-sheet altimeters in that it is a photon-counting LIDAR. ATLAS records a set of arrival times for individual photons, which are then analyzed to derive surface, vegetation, and cloud properties. ATLAS has six beams arranged in three pairs, so that it samples each of three reference pair tracks with a pair of beams; ATLAS transmits pulses at 10 kHz, giving approximately one pulse every 0.7 m along track; ATLAS's expected pointing control will be better than 90 m RMS. Pre-Release 12/31/17 A document describing the ATLAS instrument will be provided by the ICESat-2 Project Science Office. ICESat-2 Ice, Cloud, and land Elevation Satellite-2 Spacecraft 31-Dec-16 31-Dec-16 The Ice, Cloud, and land Elevation Satellite-2 (ICESat-2): Science requirements, concept, and implementation. Thorsten Markus, Tom Neumann, Anthony Martino, Waleed Abdalati, Kelly Brunt, Beata Csatho, Sinead Farrell, Helen Fricker, Alex Gardner, David Harding, Michael Jasinski, Ron Kwok, Lori Magruder, Dan Lubin, Scott Luthcke, James Morison, Ross Nelson, Amy Neuenschwander, Stephen Palm, Sorin Popescu, CK Shum, Bob E. Schutz, Benjamin Smith, Yuekui Yang, Jay Zwally. http://dx.doi.org/10.1016/j.rse.2016.12.029 NOT_SET directInternal TBD TBD TBD NOT_SET directInternal TBD TBD TBD NOT_SET ATL02_SDP utf8 v4.3 eng Feb 2020 ICESat-2-SIPS-SPEC-4257 - ATLAS Science Algorithm Standard Data Product (SDP) Volume 2 (ATL02) asNeeded SET_BY_META 006 eng utf8 NSIDC DAAC > NASA National Snow and Ice Data Center Distributed Active Archive Center ATLAS/ICESat-2 L1B Converted Telemetry Data ATL02 doi:10.5067/ATLAS/ATL02.006 2022-08-09 National Aeronautics and Space Administration (NASA) ATL02 Science unit converted time ordered telemetry calibrated for instrument effects. All photon events per beam per shot. Includes atmosphere raw profiles, housekeeping data, engineering data, s/c position, and pointing data. The purpose of ATL02 is to provide science-unit, calibrated data for upstream processing. Data converted from raw counts to science units, calibrated for instrument effects and precisely time-tagged. ATL02 provides the position and pointing data needed to precisely geolocate each photon. ATL02 is of limited use to the science community. The software that generates the ATL02 product was designed and implemented at the NASA Wallops Flight Facility in Wallops Island, Virginia. onGoing HDF 5 geoscientificInformation ICESat-2 > Ice, Cloud, and land Elevation Satellite-2 along-track 2023-01-03T18:15:50.000000Z 8add2519-6f47-352b-95c1-dd0a36c20c52 ATL02_20221231235632_01741814_006_01.h5 006 eng utf8 ATL02 GSFC I-SIPS > ICESat-2 Science Investigator-led Processing System ATL02 Science unit converted time ordered telemetry calibrated for instrument effects. All photon events per beam per shot. Includes atmosphere raw profiles, housekeeping data, engineering data, s/c position, and pointing data. The purpose of ATL02 is to provide science-unit, calibrated data for upstream processing. Data converted from raw counts to science units, calibrated for instrument effects and precisely time-tagged. ATL02 provides the position and pointing data needed to precisely geolocate each photon. ATL02 is of limited use to the science community. The software that generates the ATL02 product was designed and implemented at the NASA Wallops Flight Facility in Wallops Island, Virginia. onGoing geoscientificInformation 0.024205599999999997 -147.1225872 -26.963315599999998 -149.89922479999998 2022-12-31T23:56:31.880938Z 2023-01-01T00:03:34.876648Z An ASCII product that contains statistical information on data product results. These statistics enable data producers and users to assess the quality of the data in the data product granule 2023-01-03T18:18:08.000000Z ATL02_20221231235632_01741814_006_01.qa Text-based keyword=value file generated automatically within the ICESat-2 data system that specifies all of the conditions required for each individual run of the software. CTL_atlas_l1b_011452281.ctl CNTL 1 TAI to UTC leapsecond file retrieved from ftp://maia.usno.navy.mil/ser7/tai-utc.dat SET_BY_PGE SET_BY_PGE SET_BY_PGE SET_BY_PGE HDF5 template file that defines the organization and default content of the product metadata. atl02_metadata_template.h5 ANC26-02 b38f0fd2-13f9-3915-b88b-2db6daa85ddc 050 ATLAS calibrations file derived from CAL products provided by the ATLAS CAL team. anc21_20221021_001_01.h5 ANC21 9873e078-d6a9-3924-8dfa-aae72545886d 20221021 ISO 19139 XML file containing Series-level metadata information. ANC36-02_20221024174747_006_01.xml ANC36-02 92a724ee-72bc-3477-ac83-5defc9911d26 006 ISO 19139 XML file containing DataSet-level metadata information. ANC38-02_20221024174748_006_01.xml ANC38-02 0d855903-5102-3caa-92f1-f07842564d29 006 HDF5 template file that defines the organization and default content of the product. atl02_template.h5 ANC25-02 0c0b8092-d872-38e7-b70a-97564b1a6d67 050 Frequency/Trend file provided by the ICESat-2 Instrument Support Facility. ANC27_002_20221227000000.DAT ANC27 c457e076-d812-3808-9ae7-62d33183dad6 002 Instrument state file provided by the ICESat-2 Instrument Support Facility. ANC13_001_20223050000000_01.DAT ANC13 98faab5b-4eed-30d1-bf21-e25d73424f86 001 TAI to UTC leapsecond file retrieved from ftp://maia.usno.navy.mil/ser7/tai-utc.dat tai_utc_2017.dat ANC19 7c66d365-278a-31f7-8fe4-9c80e2f012e5 001 L1A data product. SET_BY_PGE SET_BY_PGE ATL01_20221231235632_01741814_003_01.h5 ATL01 be0bd1d1-38e0-3f11-b1d0-128639f07408 003 18 18 23954 23954 174 174 14 14 Browse processing is performed for each granule SIPS produces. The browse utility reads data from the granule and produces browse images as defined in the respective product ATBD. The utility then embeds each browse image into the product within the /Browse group. atlas_brw Version 3.0 Sep 21 2022 Creates ATLAS HDF5 browse files CTL_atlas_l1b_011452281.ctl 2023-01-03T18:18:48.000000Z Metadata information is processed by the metadata utility for each granule produced by SIPS. During PGE processing, dynamic metadata are written to the product. Additional static information is provided with the metadata template. The metadata utility reads ISO Dataset and Series metadata files and updates the product with static information from within those files. The utility then merges the static and dynamic metadata to creates output ISO19139 Dataset and Series XML files. Finally the utility reads the ISO19139 Dataset and Series XML files into memory and stores the textual representations as attributes attached to the /METADATA group. atlas_meta Version 5.0 Sep 21 2022 Creates ATLAS XML metadata files CTL_atlas_l1b_011452281.ctl 2023-01-03T18:19:07.000000Z 12/20/2019 Algorithm Theoretical Basis Document (ATBD) for ATL02 (Level 1B) Data Product Processing v.3 Feb 2020 ATLAS Science Algorithm Software Design Description (SDD) - Volume 6 (atlas_l1b) The atlas_l1b process reads reformatted telemetry data (ATL01), performs science and engineering unit conversion, applies instrument-based calibrations and writes the information to ATL02. In addition, the software splits photons into strong/weak beams, performs duplicate event removal, and detects Transmitter Echo Path (TEP) photons. atlas_l1b Version 5.0 Sep 21 2022 ATLAS L1B PGE CTL_atlas_l1b_011452281.ctl 2023-01-03T18:15:50.000000Z QA processing is performed by an external utility on each granule produced by SIPS. The utility reads the granule, performs both generic and product-specific quality-assessment calculations, and writes a text-based quality assessment report. The name and creation data of this report are identified within the QADatasetIdentification metadata atl02_qa_util Version 5.0 Sep 21 2022 ATL02 QA Utility CTL_atlas_l1b_011452281.ctl 2023-01-03T18:18:08.000000Z