Quasi real-time monitoring of CE-5 inter-device separation based on same-beam interferometry

doi:10.11947/j.AGCS.2019.20180351

Abstract

Abstract: The lunar spacecraft Chang'E-5 includes the orbiter, the returner, the lander and the riser. During the round-moon flight phase, the real-time monitoring of separation between two combinations, the orbiter/returner assembly and the lander/riser assembly, is the key detection section of flight control. It is proposed that a nearly real-time separation monitoring by using very long baseline interferometry (VLBI) technology. Particularly, during the separation process, the state-of-art measuring technique of same-beam interferometry (SBI) can be obtained from the downlink signals transmitted from the different antennas of the two assemblies, and the resulting relative phase delay can improve the relative distance resolution. The Chang'E-3 static test shows that the relative distance between the two antennas of its lander is solved with the accuracy of <0.3 m with the SBI measurements on a single baseline and the average error is about 0.15 m. The simulated Chang'E-5 separation shows that the separation response time based on SBI measurements is determined with double thresholds with a delay of no more than 30 s.

Key words: same-beam interferometry (SBI), Chang'E-5, relative distance, single point solution

CLC Number:

P228

GAO Yunpeng, REN Tianpeng, DU Lan, CHEN Sirui, ZHANG Zhongkai. Quasi real-time monitoring of CE-5 inter-device separation based on same-beam interferometry[J]. Acta Geodaetica et Cartographica Sinica, 2019, 48(10): 1216-1224.

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