An Analysis of Precise Positioning and Accuracy of the CE-3 Lunarlander Soft Landing

CAO Jianfeng; ZHANG Yu; HU Songjie; HUANG Yong; CHEN Ming

doi:10.13203/j.whugis20140123

Volume 41 Issue 2

Feb. 2016

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Geomatics and Information Science of Wuhan University > 2016 > 41(2): 274-278. > DOI: 10.13203/j.whugis20140123

CAO Jianfeng, ZHANG Yu, HU Songjie, HUANG Yong, CHEN Ming. An Analysis of Precise Positioning and Accuracy of the CE-3 Lunarlander Soft Landing[J]. Geomatics and Information Science of Wuhan University, 2016, 41(2): 274-278. DOI: 10.13203/j.whugis20140123

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An Analysis of Precise Positioning and Accuracy of the CE-3 Lunarlander Soft Landing

1.
Science and Technology on Aerospace Flight Dynamics Laboratory, Beijing 100094, China;
2.
Beijing Aerospace Control Center, Beijing 100094, China;
3.
Shanghai Astronomical Observatory, Shanghai 200030, China

Funds: The National Natural Science Foundation of China, Nos. 11173005, 11373013, 11203003, 11303001, 61304233.

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Received Date: July 05, 2014
Published Date: February 04, 2016

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Abstract

Abstract

In December, 2013, the Chinese lunar lander Chang'E-3 made a soft landing on the Moon successfully. Its precision positioning is a basic requirement in the analysis of scientific data. In this paper, the modeling of the precise observation equation and the statistical positioning method are first described briefly. Second, using the limited tracking data of the lander, the statistical positioning of the lander was performed and the positioning accuracy analyzed by three different methods. The results indicate that the determined altitude of the lander was approximately 4.5 m different from the latest lunar topographical model. Compared with the lander location observed from the lunar reconnaissance orbiter camera, there is a deviation less than 100 m in the three dimensions. We subsequeently analyze the positioning ability under current tracking conditions using the covariance analysis theory. These results show that the systematic error in the ranging data was the main limiting factor that restricts lander positioning accuracy, and an accuracy of 10 m positioning solution may be obtained if this bias is removed.
- Chang'E-3 lander,
- statistical positioning,
- lunar elevation model,
- covariance analysis

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