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嫦娥四号探测器中国深空网干涉测量数据定轨精度及分时采集模式分析
牛东文, 段建锋, 王美, 陈略, 路伟涛, 任天鹏
北京航天飞行控制中心
摘要:
本文针对嫦娥四号探测器任务中国深空网佳木斯深空站和喀什深空站的干涉测量观测数据,分析了实时测量数据和事后修正数据与USB测量数据的联合定轨精度,在地月转移段与精密轨道均相差百米量级,在环月段与精密星历均相差十米量级,同时分析了权重设置和采用分时采集模式以减小干涉测量数据量对轨道精度的影响。结果显示:中国深空网干涉测量数据实时测量数据精度已达到事后修正数据精度,可以对我国后续深空探测任务提供支持,同时对于每天2小时至3小时双站共视弧长,在分时采集模式下可以以步长1分钟每天总计采集20分钟数据而保证轨道精度不降低。
关键词:  深空网;干涉测量;分时采集;精度分析
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基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
A study of the orbit determination ability and time-sharing acquisition mode for China's Deep Space Network VLBI data for Chang 'E-4 prober
NIU Dongwen, DUAN Jianfeng, WANG Mei, CHEN Lue, LU Weitao, REN Tianpeng
Beijing Aerospace Control Center
Abstract:
According to the interferometric observation data of Jiamusi deep space station and Kashi deep space station of China deep space network during the mission of chang'e-4 prober, the orbit determination accuracy of real-time data or post-correction data with the USB data is analyzed. The difference between the Earth Moon transfer section and the precise orbit is 100 meters, and the difference between the ring moon section and the precise ephemeris is 10 meters. At the same time, the influences on the orbit accuracy of VLBI weight setting and the time-sharing acquisition mode ,which can reduce the amount of VLBI data, are analyzed. The results show that the real-time data accuracy of China's deep space network VLBI data has reached the accuracy of post-correction data, which can support the follow-up deep space exploration tasks in China. At the same time, for 2 to 3 hours per day of common viewing time of two stations, in the time-sharing acquisition mode, the total 20 minutes per day data and 1 minute acquisition step can ensure that the orbit accuracy does not decrease.
Key words:  deep space network; VLBI; time-sharing acquisition; accuracy analysis