中文摘要：

针对使用星敏感器进行对地指向精度问题,分析了影响卫星对地指向精度的主要因素,根据卫星轨道误差,推导了轨道根数误差对经度方向和纬度方向上的指向误差方程.分析了轨道根数对指向精度的影响规律.最后对轨道根数误差的影响进行了仿真,仿真结果与分析结果一致.

英文摘要：

The factors that influence the Earth-pointing precision by using the star tracker are analyzed. The analytical expressions of pointing errors are given, which are affected by orbital parameters in the directions of both the longitude and latitude. Simulation results show that the analytical results are consistent with the computational results.