SNR periodical variation of Chang＇E-3 spacecraft orbiting the Moon

Chang＇E-3 spacecraft was orbiting the Moon from December 6 14, 2013, and very long baseline interferometry （VLBI） observations were performed to improve the accuracy of its orbit determination. In the process of recording VLBI raw data, 2 bits quantization was implemented. Interesting phenomenon was...

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Bibliographic Details
Published in:中国航空学报：英文版 2016 (2), p.470-478
Main Author: He Qingbao Liu Qinghu Li Peijia Kawaguchi Noriyuki Wu Yajun Zheng Xin Zhang Juan Xu Zhijun
Format: Article
Language:English
Subjects:
VLBI站
信噪比
周期性变化
月球轨道
甚长基线干涉测量
系统噪声温度
轨道运行
飞船
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Summary:Chang＇E-3 spacecraft was orbiting the Moon from December 6 14, 2013, and very long baseline interferometry （VLBI） observations were performed to improve the accuracy of its orbit determination. In the process of recording VLBI raw data, 2 bits quantization was implemented. Interesting phenomenon was that signal-to-noise ratio （SNR） of each VLBI station experienced periodical change and had large variation on amplitude while in the Moon＇s orbit, whereas SNR kept in a stable level after Chang＇E-3 landed on the Moon. Influence of varying elevation angle on SNR was analyzed and compensation of 2 bits quantization harmonics to SNR calculation was investigated. Most importantly, telescope system noise temperature increase caused by the Moon was computed along the time of Chang＇E-3 orbiting the Moon, and well matched SNR changing trend in terms of correlation coefficients.
ISSN:1000-9361