中文摘要：

分析了不同重力场对低轨卫星运动影响的特征，并基于CHAMP卫星和GRACE卫星的真实轨道，利用轨道积分和轨道拟舍的方法，研究了线性分段加速度、周期性分段加速度以厦虚拟随机脉冲加速度在精密定轨中对重力场模型误差的补偿效果。

英文摘要：

Based on the orbit integration and orbit fitting method, the characters of the influence of the gravity model with different precision on the movement of low earth orbit satellites was studied. The way and the effect of reducing the influence of gravity model error to CHAMP and GRACE satellites orbits by liner and periodical empirical acceleration model and so-called ＂pseudo-stochastic pulses＂ mode were also analyzed.