Dual-Target Joint Orbit Determination Technology of Chang'E-5
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 measure-ment 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 sig-nificantly improved in orbit determination.
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