一种有效提高CE-1卫星卸载前后精密星历衔接精度的定轨策略

An Effective Orbit Determination Strategy to Improve the Cohesion Precision of Chang'E One Satellite's Precise Ephemeris Before and After Unloading

主要讨论了动量轮卸载对嫦娥一号卫星绕月轨道的影响以及这种影响对其精密星历衔接段精度的影响,分析了不同轨道改进策略下的精密星历衔接弧段的精度,认为使用2~3d的弧段进行轨道改进及卸载计算能得到较高精度的搭接星历,并通过使用实测数据进行定轨改进计算进行了验证,结果表明,该策略可以使星历衔接精度在沿迹方向（T）提高至优于100m量级。

The influence of momentum wheel unloading of Chang＇ E - 1 satellite into orbit around the moon and the influence on the precise ephemeris convergence precision are mainly discussed in this paper. And the cohesion precision of Chang＇ E One＇ s precise ephemeris is analyzed by the different orbit determination strategies. Finally, the idea that calculate the unloading in orbit improvement by using arc 2 - 3 days can achieve fair better cohesion ephemeris, and it is verified by using the really measured data. The results show that this strategy can make the precision of cohesion in along-track direction （T） improved to better than 100 meters magnitude.