摘要
我国探月工程三期"嫦娥五号"月球探测器(CE-5)将实现月球采样返回探测,月球交会对接是CE-5工程中的关键技术,CE-5任务中将采用地基无线电测距测速技术联合同波束VLBI测量技术实现对轨道器和上升器的联合测定轨,以支持月球交会对接过程特别是远程导引阶段的多探测器测控.本文分析了同波束VLBI测量数据在多探测器定轨中的应用,利用仿真数据分析了月球交会对接远程导引段的轨道器和上升器定轨精度,特别是两器间的相对定轨精度.选取的长弧和短弧定轨典型算例分析表明,利用10 ps精度的同波束VLBI数据,联合测距数据对轨道器和上升器定轨,可以达到1 m的相对定轨精度.
CE-5 will be launched in 2017-2018, and it is a lunar sampling return mission. It is the first time for China to carry out the rendezvous and docking in the Moon. How to achieve rendezvous and docking successfully in the Moon is very important for CE-5 project. When the ascender is about 70 km farther away from the orbiter, the ground based tracking technique including range, Doppler and VLBI will be used to track the orbiter and the ascender. Later the ascender will approach the orbiter automatically. Here the application of the same beam VLBI for the orbit determination of the orbiter and the ascender in the long range of the rendezvous and docking phase is discussed. The same beam VLBI technique can be used to track the orbiter and the ascender simultaneously when they are in the same beam. Delta delay of the two probes can be derived, and the measurement accuracy is much higher than that of the traditional VLBI data because of the cancelation of common errors. Theoretically it can result in a more accurate relative orbit between the two probes. The simulation results show that the relative position accuracy of the orbiter and ascender can reach about 1 m in CE-5 project with delta delay data of 10 ps.
出处
《中国科学：物理学、力学、天文学》
CSCD
北大核心
2016年第8期86-93,共8页
Scientia Sinica Physica,Mechanica & Astronomica
基金
国家自然科学基金(编号:11473056
11403076)
上海市科学技术委员会(编号:3912DZ227330001)
中国科学院行星科学实验室和探月工程资助项目
关键词
同波束VLBI
交会对接
嫦娥五号
定轨
same-beam VLBI, rendezvous and docking, CE-5, orbit determination
