重力卫星在轨质心修正原理

静电悬浮加速度计在重力卫星上的安装位置将直接影响重力卫星的非重力测量结果,进而影响高精度地球重力场的恢复。为了彻底明确该影响的存在方式,现从基本动力学方程出发,推导出了卫星在轨飞行期间遭受的各种非重力和地球引力、太阳和月球等天体的潮汐力等,与静电悬浮加速度计输出之间的矢量表达式。获得的表达式从理论上明确了消除重力卫星质心偏差的实际意义,是重力卫星质心修正的理论依据。

The Trimming Principle of Center of Mass of Gravity Satellite During Orbit Flight

The fixed position of hte electrostatic accelerometer on gravity satellite will affect the non gravity measurement results of the gravity satellite, and then will effect the recovering precision of the earth gravity field. In order to realize completely the affection existing manner, this paper has deduced the vector expression between the output of electrostatic accelerometer and the forces acting on the gravity satellite during orbit flight period, such as the every kind of non gravities, earth gravity, the tide forces from celestial bodies as sun and moon, etc. The deduced expression has pointed out theoretically the significance of eliminationg the gravity satellite COM(center of mass) offset, which is the theory foundation for trimming the satellite COM-|offset.