Processing and Analysis of Earth Gravity Field of Accelerometer Data for CHAMP

The high frequency STAR micro-accelerometer can provide the nogravitational perturbation force acceleration acting on CHAMP satellite. From the CHAMP mission level-2 data, the 0.1Hz acceleration, Star camera data, thruster firing data and some corrections are available. In this paper, the level-2 data (from 2002 001 to 2002 100) were processed. Before applying corrections, which are provided by CNES, the curves of mean acceleration per day are very rough. When the corrections were applied, the curves show the clear trend. Finally, the results from 2002 001 to 2002 100 CHAMP level-2 data are discussed, and some suggestions in CHAMP data processing are given.