CHAMP gravity field recovery using kinematic orbits
利用CHAMP卫星几何法轨道恢复地球重力场模型

A global gravity field recovery based on energy balance approach using CHAMP kinematic orbits is presented. A method combining the Newton's numerical differential formula and the remove-restore procedure for determining kinematic velocities is developed. Three global gravity field models with 50 degree and order grids are recovered using CHAMP kinematic orbits provided by Technical University of Munich (TUM). The comparisons with GRIM5-C1, EIGEN-1S and EIGEN-2 indicate that the recovered models are in good agreement EIGEN-2 with degree variance of difference as well as geoid difference. The assessments on these models using Arctic gravity anomalies data show that they have nearly the same quality with EIGEN-1S and EIGEN-2, and perform better than GRIM5-C1.