Sensitivity Analysis of Low-Low Track Gravity Satellite Inter-Satellite
Range Rate to Regional Mass Anomaly
1 Xi’an Research Institute of Surveying and Mapping, 1 Mid-Yanta Road, Xi’an 710054, China
2 State Key Laboratory of Geo-Information Engineering, 1 Mid-Yanta Road, Xi’an 710054, China
3 Technical Division of Surveying and Mapping, 36 Xiying Road, Xi’an 710054, China
Abstract：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.