HR: 0800h
AN: G31C-0805    [Abstracts]
TI: GRACE KBR and Accelerometer Data Reduction and Calibration
AU: * Rowlands, D D
EM: David.D.Rowlands@nasa.gov
AF: NASA Goddard Space Flight Center, Space Geodesy Branch Code 926, Greenbelt, MD 20770 United States
AU: Luthcke, S B
EM: Scott.B.Luthcke@nasa.gov
AF: NASA Goddard Space Flight Center, Space Geodesy Branch Code 926, Greenbelt, MD 20770 United States
AU: Klosko, S M
AF: Raytheon ITSS, 1616 McCormick Drive, Landover, MD 20774 United States
AU: Lemoine, F G
AF: NASA Goddard Space Flight Center, Space Geodesy Branch Code 926, Greenbelt, MD 20770 United States
AU: Williams, T A
AF: Raytheon ITSS, 1616 McCormick Drive, Landover, MD 20774 United States
AB: The Gravity Recovery And Climate Experiment (GRACE), launched on March 17, 2002, represents the state-of-the-art in geodetic observations of the static and time varying components of the Earth's geopotential field. The fundamental measurement used to observe gravity is the inter-satellite range and range rate between two coplanar, low altitude satellites obtained from a K-band ranging (KBR) system. In addition to the K-band ranging system, each satellite possess a SuperSTAR Accelerometer, a GPS receiver/antenna package, Star Cameras and a Laser Retro Reflector (LRR) to complete the compliment of science instruments. The GRACE project has now released two years of Level 1B data derived from the science instruments and sensors. An integral component of our time variable gravity research is the reduction, calibration and analyses of these Level 1B data. In particular we have analyzed several months of K-band ranging (KBR1B), accelerometry (ACC1B) and GPS navigation (GNAV1B) data. Accelerometer calibration and KBR data reduction methodology and results will be presented. We discuss the impact of these analyses on the recovery of time variable gravity.
DE: 1214 Geopotential theory and determination
DE: 1241 Satellite orbits
DE: 1243 Space geodetic surveys
DE: 1294 Instruments and techniques
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting