GRAIL LGRS
ODE: Moon
Mission: GRAIL
Mission Site: GRAIL Team Web Site
PDS Geosciences Node: PDS Source Information
Search GRAIL LGRS data in Lunar ODE: Product Search • Map Search
The primary objective of the GRAIL mission is to obtain accurate global models for the mean components of the Moon's gravity field. This objective will be achieved by making measurements of inter-satellite range and its derivative for co-planar, low altitude, near-polar orbiting satellites, using the Lunar Gravity Ranging System (LGRS) instrumentation, which includes the Radio Science System (RSS). All raw data transmitted by the twin spacecraft are collected by the Deep Space Network (DSN) and processed to higher level products by the GRAIL Science Data System (SDS) at JPL and GRAIL Science Team members at their respective institutions.
There are two payload elements on each GRAIL orbiter: the Lunar Gravity Ranging System (LGRS) which is the science instrument, and the MoonKAM lunar imager which is used for education and public outreach. The LGRS is based on the instrument used for the Gravity Recovery and Climate Experiment (GRACE) mission [32], which has been mapping Earth's gravity since 2002. The LGRS is responsible for sending and receiving the signals needed to accurately and precisely measure the changes in range between the two orbiters. The LGRS consists of an Ultra-Stable Oscillator (USO), Microwave Assembly (MWA), a Time-Transfer Assembly (TTA), and the Gravity Recovery Processor Assembly (GPA).
GRAIL Products
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Data Set |
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Experiment Data Record - More Information: |
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The RSS EDR data set contains raw radio science data, which include DSN Doppler tracking data, open-loop data, media calibrations, and others. - More Information: |
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Level 1A Calibrated Data Record - More Information: |
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Level 1B Calibrated Data Record - More Information: |
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Reduced Data Record - More Information: NOTE: As of June 24th, 2013, GRAIL Derived Data Products (RDRs) were undergoing PDS peer review. They are available here for public use by special request of the GRAIL Team. The user is cautioned that the data products and other components of the archive may be changed as a result of the review. The archive is scheduled for official release by PDS on October 11, 2013. |