中国深空网VLBI定轨精度及分时采集模式分析  

A Study of the Orbit Determination Ability and Time-Sharing Acquisition Mode for China’s Deep Space Network VLBI Data

作　　者：牛东文 段建锋[1] 王美[1] 陈略[1] 路伟涛[1] 任天鹏[1] NIU Dongwen;DUAN Jianfeng;WANG Mei;CHEN Lue;LU Weitao;REN Tianpeng(Beijing Aerospace Control Center,Beijing 100094,China)

机构地区：[1]北京航天飞行控制中心,北京100094

出　　处：《深空探测学报（中英文）》2021年第5期495-502,共8页Journal Of Deep Space Exploration

基　　金：国家自然科学基金资助项目(11973015)。

摘　　要：针对“嫦娥四号”(CE-4)探测器任务,应用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分别与统一S波段(Unified S-Band,USB)测量数据的联合定轨精度,同时分析了权重设置对轨道精度的影响;针对后续深空任务中中国深空网的链路实际,提出了分时采集模式以降低干涉测量数据量,利用“嫦娥四号”探测器的干涉测量实测数据,分析了分时采集模式对轨道精度的影响。结果显示:在地月转移段与精密轨道均相差百m量级,在环月段与精密星历均相差10 m量级,说明中国深空网干涉测量实时测量数据精度已达到事后修正数据精度;同时对于每天2~3 h双站共视弧长,在分时采集模式下,采用步长1 min每日总计采集20 min数据的方法,可保证轨道精度不降低。研究可对中国后续深空探测任务提供支持。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 and post-correction data respectively combined 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 of VLBI data weight setting on the orbit accuracy is analyzed.In view of theChina deep space network in subsequent deep space missions such as Chang’E 5,a time-sharing acquisition mode is proposed to reduce the amount of VLBI data.The influence of this mode on orbit accuracy is analyzed by using the measured VLBI data of Chang’E 4 prober.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.

关 键 词：深空网 干涉测量 分时采集 精度分析 

分 类 号：V11[航空宇航科学与技术—人机与环境工程]