低低跟踪重力卫星星间距离变率对区域质量异常敏感度分析

Sensitivity Analysis of Low-Low Track Gravity Satellite Inter-Satellite Range Rate to Regional Mass Anomaly

推导了区域质量变化和球谐系数变化量之间的函数关系,根据该关系式可将不同区域质量异常对重力场变化的影响分离出来。设计仿真实验,分析时变重力场模型下星间距离变率相对稳态背景重力场模型下星间距离变率值的残差变化。结果表明,区域质量异常对星间距离变率的影响在空间分布上是有限的,但星间距离变率对区域质量异常具有很高的敏感性。

High precision inter-satellite range rate is sensitive to mass anomaly in the Earth＇s surface region.The function of the relationship between regional mass anomaly and spherical harmonic coefficients variation is deduced.According to this relationship,the influence of mass anomaly in different regions on gravity can be separated.The influence is simulated by adding mass variation of a certain height of equivalent water and analyzing the range rate residual of time-variable gravity field relative to background gravity field.The result shows that the influence of regional mass anomaly on range rate is limited spatially,and that range rate is very sensitive,and that the sensitivity is related to the content of mass variation.