摘要
An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach IS developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily Integration constant, scale and bias parameters. Two 60 degree and order gravitational potential models, XISM-CHAMPO1S from the classical energy balance approach, and XISM-CHAMPO2S from the improved energy balance, are determined using about one year＇s worth of CHAMP kinematic orbits from TUM and accelerometer data from GFZ. Comparisons among XISM-CHAMPO1S, XISM-CHAMPO2S, EIGEN-CGO3C, EIGEN-CHAMPO3S, EIGEN2, ENIGNIS and EGM96 are made. The results show that the XISM-CHAMPO2S model is more accurate than EGM96, EIGENIS, EIGEN2 and XISM-CHAMPO1S at the same degree and order, and has almost the same accuracy as EIGEN-CHAMPO3S.
为重力场决心从的一个有效方法捣烂轨道和加速表数据被叫作能量平衡途径。一新捣烂重力场恢复策略在这篇论文基于改进能量平衡途径被开发。方法同时解决球形的泛音系数，每日的集成常数，规模和偏爱参数。二 60 个度和顺序重力势模型，从古典能量平衡途径的 XISM-CHAMP01S，和从改进能量平衡的 XISM-CHAMP02S，用大约一年的价值被决定捣烂从从 GFZ 的弦音器和加速表数据的运动学的轨道。在 XISM-CHAMP01S， XISM-CHAMP02S， EIGEN-CG03C， EIGEN-CHAMP03S， EIGEN2， ENIGN1S 和 EGM96 之中的比较被做。结果证明 XISM-CHAMP02S 模型在一样的度和顺序是比 EGM96， EIGEN1S， EIGEN2 和 XISM-CHAMP01S 更精确的，并且几乎有象 EIGEN-CHAMP03S 的一样的精确性。
基金
Supported by the National Natural Science Foundation of China （No.40604003, 40474001）. Acknowledgements： We are grateful to the ISDC of the GFZ Potsdam for providing the data and to Gerlach C. and Svehla D. at the TUM for the kinematic orbits.
