嫦娥五号双目标联合定轨技术研究

Dual-Target Joint Orbit Determination Technology of Chang’E-5

摘要: 为提升轨道器与上升器在月球交会对接过程中的相对轨道精度,以嫦娥五号双目标联合测量为基础,建立了同波束测量（same beam interferometry, SBI）和星间测量的模型,设计了轨道器与上升器联合的统计定轨算法。利用基准轨道分析了SBI时延、时延率和微波雷达/激光雷达的测距、测速数据精度,结果表明,嫦娥五号SBI与甚长基线干涉测量精度相当,微波雷达/激光雷达的测距精度为米级。在定轨中建立两目标相对运动关系,能够明显提升相对轨道精度。

Abstract:
Objectives The accuracy of relative track between orbiter and ascender can ensure success and safety during the meeting and docking process of Lunar.
Methods Based on dual-target joint measurement of Chang’E-5, we established the same beam interferomery(SBI) measurement and inter-satellite measurement model, and designed a statistical orbit determination algorithm combined with orbiter and ascender.
Results We used the reference orbit to analyze delay and delay rate of SBI, and the range and range accuracy of microwave radar/laser radar. The accuracy of SBI is equivalent to that of very long baseline interferometry, and the range accuracy of microwave radar/laser radar is at meter level.
Conclusions By establishing the relative motion relationship between the two targets, the relative orbit accuracy can be significantly improved in orbit determination.