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“嫦娥3号”月面探测器同波束干涉测量系统的设计与实现
吴伟仁1, 刘庆会2, 黄勇2, 洪晓瑜2, 节德刚1, 李海涛3
1.探月与航天工程中心, 北京 100037;2.中国科学院 上海天文台, 上海 200030;3.北京跟踪与通信技术研究所, 北京 100094
摘要:
为了提高"嫦娥3号"探测器(着陆器和巡视器)的相对定位精度,针对两器信标实际设置情况,设计了同波束干涉测量(same-beam interferometry, SBI)观测方案。利用着陆器和巡视器星地对接数据分析检验了由差分群时延解算含微小系统差的差分相时延的方法,给出了甚长基线干涉测量(very long baseline interferometry,VLBI )和同波束干涉测量模型及月面定位方法,并仿真分析了巡视器的相对定位精度。最终,把研究的方法实际应用于"嫦娥3号"巡视器的精密相对定位。结果表明,利用1 h左右的连续观测弧段的着陆器数传信号以及巡视器数传信号(或遥测信号),采用事后处理方式,得到了随机误差约1 ps的差分相时延数据。利用此数据,把"嫦娥3号"探测器的相对定位精度提高至1 m左右。
关键词:  同波束干涉测量;差分相时延;嫦娥3号;相对定位
DOI:10.15982/j.issn.2095-7777.2015.01.005
分类号:
基金项目:探月工程重大科技专项资助
Design and Realization of Same-Beam Interferometry Measurement of CE-3
WU Weiren1, LIU Qinghui2, HUANG Yong2, HONG Xiaoyu2, JIE Degang1, LI Haitao3
1.Center of Lunar Exploration and Space Program, Beijing 100037, China;2.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;3.Beijing Institute of Tracking and Telecommunication Technology, Beijing 100094, China
Abstract:
In order to improve the accuracy of relative position determination of a lunar explorer (lunar lander and rover), we designed the same-beam interferometry method according to the actual signals of the lander and the rover of CE-3. We analyzed the method for calibrating device internal delay using the strong radio source, gave the method for calculating the differential phase delay from group delay, and analyzed the accuracy of relative position determination by simulation. Finally, we used the same-beam interferometry to observe the rover and the lander of CE-3. As the results, using the lander's data-transmission signal and the rover data-transmission or telemetry signal, the differential phase delay data were obtained with a 1ps random error, and the accuracy of rover relative position was improved to about 1 m.
Key words:  same-beam interferometry;differential phase delay;CE-3;relative position determination