宇航学报

宇航学报 ›› 2019, Vol. 40 ›› Issue (9): 1014-1023.doi: 10.3873/j.issn.1000-1328.2019.09.005

• 飞行器设计与力学 • 上一篇    下一篇

CE5T拓展试验轨道精度分析

张宇，孔静，陈明，欧阳琦，段建锋   

  1. 北京航天飞行控制中心，北京 100094
  • 收稿日期:2018-11-08 修回日期:2019-03-02 出版日期:2019-09-15 发布日期:2019-09-25
  • 基金资助:

    国家自然科学基金（11872034，41804019）

Orbit Accuracy Analysis for CE5T Extended Mission

ZHANG Yu, KONG Jing, CHEN Ming, OUYANG Qi, DUAN Jian feng   

  1. Beijing Aerospace Flight Control Center, Beijing 100094, China
  • Received:2018-11-08 Revised:2019-03-02 Online:2019-09-15 Published:2019-09-25

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摘要：

针对嫦娥5T服务舱(CE5T)拓展试验中的绕地大椭圆轨道，分析了轨道动力学演化趋势，通过测轨数据类型组合策略分析了统一S频段测量(USB)和甚长基线干涉测量(VLBI)在定轨中的贡献，得到了百米级的精密定轨精度；针对地月第二平动点(L2)绕飞轨道，分析了地心和月心积分的轨道动力学差异，制定了精密定轨的参数求解策略，得到了百米级的精密定轨精度；针对月球交会对接轨道的特点，选取三种不同的重力场模型定轨，比较了三者在轨道预报和数据拟合的差异，并与嫦娥3号(CE3)环月轨道的定轨精度进行比对，验证了不同重力场的适用范围，从计算精度和效率两方面制定了优化的定轨策略。

关键词: 探月卫星, 轨道动力学, 精密定轨, 地月L2点, 甚长基线干涉测量(VLBI), 月球重力场

Abstract:

For the highly elliptical Earth orbit in the CE5T extended mission, the evolvement of the orbit dynamics is discussed. The contribution of the unified S-band (USB) and very long baseline interferometry (VLBI) tracking data are analyzed under the strategy of tracking data in precise orbit determination. For this case, the orbit determination accuracy is less than 1km. For the libration L2 point of Earth-Moon system, the dynamics difference of the Earth orbit and the lunar orbit is analyzed by using the dynamics integral method. The strategy to solve the parameters in orbit determination is developed from this analysis results. For this case, the accuracy of the orbit determination is less than 1km. For the lunar rendezvous and docking orbit, 3 lunar gravity field models are chosen in the orbit determination to compare the differences between the ephemeris prediction and data fitting. According to the orbit determination accuracy of CE3, the application of the difference gravity models is validated, and the optimization strategy is developed based on the accuracy and efficiency.

Key words:  Lunar satellite, Orbit dynamics, Precise orbit determination, Libration L2 point of Earth-Moon system, Very long baseline interferometry (VLBI), Lunar gravity field

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