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火星探测VLBI测定轨技术
刘庆会
中国科学院 上海天文台, 上海 200030
摘要:
我国将于2020年首次发射由环绕器和着陆巡视器组成的火星探测器,火星探测器的跟踪及精密测定轨是完成工程任务和科学探测的基础。火星探测器的跟踪和测定轨,目前主要采用基于地面无线电测量的测距、测速和甚长基线干涉VLBI测角3种手段。主要针对VLBI技术予以介绍,主要内容为:△DOR型VLBI技术在国内外的应用情况、火星探测器VLBI测定轨技术分析、基于同波束VLBI的火星车定位技术、火星探测器VLBI观测等。这些内容对我国的火星探测器测定轨有重要的应用价值。
关键词:  火星探测;VLBI;同波束VLBI;测定轨;测定位
DOI:10.15982/j.issn.2095-7777.2018.05.005
分类号:P164
基金项目:国家自然科学基金资助项目(11473059,11773060)
VLBI Orbit Determination Technology for Mars Exploration
LIU Qinghui
Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China
Abstract:
China will launch the first Mars probe composed of an orbiter and a rover in 2020. The tracking and precise orbit determination of the Mars probe is the basis for completing engineering tasks and scientific exploration. At present, three methods, ranging, Doppler measurement and VLBI (Very Long Baseline Interferometry) angle measurement based on terrestrial radio measurement, are mainly used in the tracking and orbit determination of the Mars probe. In this paper, the application of differential VLBI technology is introduced, the Mars probe VLBI technology and orbit determination errors based on VLBI and Doppler/ranging measurement in the arc segment of Martian orbit insertion are analyzed, the positioning analysis of rover based on the same-beam VLBI and the Mars probe VLBI observation are presented. The results are of great application value to the orbit determination of Mars probe in China.
Key words:  Mars exploration;VLBI;same-beam VLBI;orbit determination;measuring position