基于能量守恒方法恢复地球重力场模型

GRAVITY FIELD RECOVERY BY USING ENERGY CONSERVATION APPROACH

基于低轨卫星精密轨道和非保守力加速度数据给出了统一求解偏差、尺度、漂移及位系数的能量守恒方法。该方法不需要任何未知数初始值,避免了单独标校加速度时受先验重力场模型的影响。利用GRACE卫星102天数据恢复了89阶次重力场模型SWJTU-GRACE01,并与EGM96、EIGEN2、EIGEN-CHAMP03S、GGM02S、EIGEN-CG01C模型进行了比较。结果表明,SWJTU-GRACE01模型精度优于相同阶次的EGM96、EIGEN2、EIGEN-CHAMP03S,在低阶位系数上与GGM02S具有较好的一致性。

The energy conservation approach used for simultaneously resolving bias, scale factor, bias drift and potential coefficients based on LEO （low earth orbit）orbit data and non-gravitational accelerometer data is presented. The approach does not require any initial values of unknown parameters and the influence of a prior gravity field model can be avoided. A gravity field model up to degree and order 89 named SWJTU-GRACE01 is recovered from 102 days data of GRACE satellite. The model is compared with international model EGM96, EIGEN2, EIGEN- CHAMP03S,GGM02S and EIGEN-CG01C. The results show that the model SWJTU-GRACE01 is more accurate than the model EGM96,EIGEN2 and EIGEN-CHAMP03S in the same degree and order and has almost the same accuracy as GGM02S in the low degree and order.