低低卫卫跟踪恢复地球重力场的误差分析

Analysis of Errors for Earth Gravity Field Recovered by SST-LL

基于卫星轨道的动力学积分法,定量分析了SST-LL模式主要有效载荷测量误差对重力场恢复结果影响的特点及相互关系。结果表明,1μm/s的星间距离变化率误差与10-9m/s2的非保守力测量误差所引起的重力场误差基本相当,不同载荷的测量精度应相互匹配,单独提高某一载荷的精度对改善重力场并无多大意义。

Based on dynamic integration approach, the effects of main payloads measurement errors in SST-LL mode on Earth gravity model accuracy are analyzed quanntauvely Dy simulated calculation. The results indicate that the gravity model error caused by inter-satellite range-rate of 1μm/s and the one caused by non-conservative force error of 10^-9 m/s^2 are at the same level. The measurement accuracy of main payloads should be coincide each other. It is less helpful for improving the Earth gravity model by only improving one payload＇s measurement accuracy.