High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission

doi:10.15982/j.issn.2095-7777.2020.20200026

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Journal of Deep Space Exploration ›› 2020, Vol. 7 ›› Issue (4) : 332-339. DOI: 10.15982/j.issn.2095-7777.2020.20200026

Topic：Very Long Baseline Interferometry Technology

High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission

WANG Guangli^1,2,3,4, HONG Xiaoyu^1,2,3, LIU Qinghui^1,3, LI Bin¹, MA Jun⁵, SU Yan⁶, HAO Longfei⁷

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Abstract

Chang'E-4（CE-4）achieved the soft landing and patrol survey on the far side of the Moon for the first time in the world. The S-band ΔDOR measurement technology is used in the relay satellite mission，and the new S-band ΔDOR observation data processing system is developed. During the prober mission，the VLBI system realized fast time-sharing observations for the relay satellite and lander-rover combination prober for the first time；and the Tianma radio telescope is used to calibrate the relay satellite antenna in orbit. Considering the characteristics of CE-4，the key technical issues to be solved by the VLBI technology are analyzed，and specific measures are proposed. The analysis of the measurement results during the real-time mission of the two spacecraft show that these technical measures play important roles in the accomplishment of mission goals.

Keywords

Chang’E-4 / VLBI / ΔDOR / antenna pointing calibration

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WANG Guangli, HONG Xiaoyu, LIU Qinghui, LI Bin, MA Jun, SU Yan, HAO Longfei. High-Precision VLBI Orbit Measurement Technology in the Chang'E-4 Mission. Journal of Deep Space Exploration, 2020, 7(4): 332‒339 https://doi.org/10.15982/j.issn.2095-7777.2020.20200026

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