GRACE LEVEL 1B JPL RELEASE 3.0
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DOI10.5067/GRJPL-L1B03
Short NameGRACE_L1B_GRAV_JPL_RL03
DescriptionFOR EXPERT USE ONLY. The GRACE Level 1B data provide all necessary inputs to derive monthly time variations in the Earth's gravity field. Level 1B data are also used for GRACE orbit and mean gravity field determination. It contains K-Band Ranging Data Product (KBR1B), Star Camera Data Product (SCA1B), Accelerometer Data Product (ACC1B), GPS Data Product (GPS1B), Vector Products (VGN1B, VGO1B, VGB1B, VCM1B, VKB1B, VSL1B), Quaternion Products (QSA1B, QSB1B), and Housekeeping Products (AHK1B, IHK1B, THR1B, TNK1B, MAG1B, MAS1B, TIM1B)The GRACE Level-1B RL03 data consists only of updated spacecraft attitude (SCA1B) and K-band inter-satellite ranging (KBR1B) data. All other Level-1B were not changed and it is recommended to use the RL02 products with the updated RL03 KBR1B and SCA1B products. The RL03 SCA1B data were corrected for a stellar aberration error in the onboard star tracker software and incorrect data weighting in the star tracker combination software. For the RL03 SCA1B data a new software module was developed that uses Kalman filtering, field of view error modeling, relative alignment adjustment and the inclusion of angular spacecraft body acceleration measurements from the ACC instrument. This new processing resulted in a significant reduction in high frequency noise and the elimination of jumps during transitions between dual and single star tracker operation. The KBR1B product is updated as well because the KBR antenna phase center range correction, range rate correction and range acceleration are computed using the spacecraft attitude information (SCA1B). Only these three correction values were updated in the KBR1B product. All other entries in the KBR1B remained the same.
Version3
Dataset TypeOPEN
MeasurementSOLID EARTH > GRAVITY/GRAVITATIONAL FIELD > GRAVITY
Processing Level1B
CoverageRegion: Global
Northernmost Latitude: 88 degrees
Southernmost Latitude: -88 degrees
Westernmost Longitude: -180 degrees
Easternmost Longitude: 180 degrees
Time Span: 2002-Apr-01 to 2017-Jul-01
Granule Time Span: 2002-Apr-01 to 2017-Jun-30
ResolutionSpatial Resolution: 500 km (Along) x 500 km (Across)
ProjectionType: Spherical
Detail: N/A
Ellipsoid: WGS 84
Latency hours
Swath Width- km
Sample Frequency-
Temporal Repeat (Nominal)1 Month
Temporal Repeat (Min)-
Temporal Repeat (Max)-
Platform/Sensor
GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1 minutes
Inclination Angle: 89 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
GRACE SCA
SENSOR
Name: Star Camera Assembly (GRACE SCA)
Swath Width: - km
Description: The two star cameras mounted close to the accelerometer on each satellite provide the precise attitude references for the satellites when making science measurements.

GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1 minutes
Inclination Angle: 89 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
GRACE KBR
SENSOR
Name: GRACE K-Band Ranging System (GRACE KBR)
Swath Width: -1 km
Description: This instrument precisely measures the changes in the separation between the two GRACE satellites using phase tracking of K- and Ka-band signals sent between the two satellites

GRACE
Platform
Name: Gravity Recovery and Climate Experiment (GRACE)
Orbit Period: -1 minutes
Inclination Angle: 89 degrees
Ascending Node: 1970-Jan-01 00:00:00
/
GRACE ACC
SENSOR
Name: GRACE SuperSTAR Accelerometer (GRACE ACC)
Swath Width: -1 km
Description: The accelerometer, located at the center of mass of each satellite, measures all non-gravitational forces acting on each satellite. These forces include air drag, solar radiation pressure, and attitude control activator operation.

ProjectGravity Recovery and Climate Experiment (GRACE)
Data ProviderCreator: GRACE
Release Place: JPL
Release Date: 2018-Jul-05
Resource: https://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/
Keyword(s)gravity, GRACE, JPL, L1B, RL03
Persistent IDPODAAC-GRJPL-L1B03
Questions related to this dataset? Contact podaac@podaac.jpl.nasa.gov
Citation GRACE. 2018. GRACE LEVEL 1B JPL RELEASE 3.0. Ver. 3. PO.DAAC, CA, USA. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/GRJPL-L1B03.

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For more information see Data Citations and Acknowledgments.

Journal Reference K. Case, G. Kruizinga, and S. Wu, 2002, GRACE Level 1B Data Product User Handbook, JPL Publication D-22027. https://podaac-tools.jpl.nasa.gov/drive/files/allData/grace/docs/Handbook_1B_v1.3.pdf