GRACE Orbit Deterimation for Gravity Field Recovery at CSR

Details GRACE Orbit Deterimation for Gravity Field Recovery at CSR GRACE Orbit Deterimation for Gravity Field Recovery at CSR

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufm.g72a0969n&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #G72A-0969

Computer Science

Performance

1227 Planetary Geodesy And Gravity (5420, 5714, 6019), 1241 Satellite Orbits

Scientific paper

Determining the orbits of the GRACE satellites is an important aspect of the operational data processing for gravity field recovery. Precise orbits are required for data quality assessment and verification and finally as reference for the gravity field estimation step. Several stages are needed as part of the preparation for the gravity field solution. Using GPS tracking data, initial orbits are computed to produce model accelerometer and attitude data, edited tracking data and improved initial conditions. The model data are used to assess the performance of the accelerometer and star tracker as well as the quality of the measurements from these instruments. The tracking data are further edited to remove anomalous data. A final converged orbit is determined using the on-board accelerometer and attitude data along with the edited tracking data. Results of initial and final orbit fits for a period of data from April and May 2002 will be presented. Orbit quality metrics including GPS data residuals and SLR residuals will be presented. Improvement of the orbit fits due to an improved gravity field will be demonstrated. Using an initial GRACE derived gravity solution, an orbit accuracy at the few cm level is achieved.

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