Journal of Astronautics ›› 2016, Vol. 37 ›› Issue (10): 1157-1163.doi: 10.3873/j.issn.1000-1328.2016.10.001

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Trajectory Determination for Lunar Probe Soft Landing and Sampling Return

SONG Ye zhi, HUANG Yong, HU Xiao gong, WANG Yan,MAO Yong xing, ZHU Ling feng, CHANG Sheng qi   

  1. 1. National Time Service Centre, Chinese Academy of Sciences, Xi’an 710600, China;
    2.Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;
    3.University of Chinese Academy of Sciences, Beijing 100049, China;
    4.Institute of Surveying and Mapping, Information Engineering University, Zhengzhou 450001, China;
    5.China Satellite Maritime Tracking and Control Department, Jiangyin 214431, China;
    6.Beijing Satellite Navigation Center, Beijing 100094, China
  • Received:2016-01-05 Revised:2016-03-23 Online:2016-10-15 Published:2016-10-25


A new method of trajectory determination for soft landing and sampling return for lunar probe by numerical approximation is presented. The method describes the probe′s trajectory by B-spline and makes full use of all the tracking data to determine the trajectory. It is very suitable for fitting complicated trajectory for spline′s special properties. The dynamics and control characteristics of the sampling return is analyzed, the preliminary feasible trajectory determination method for soft landing and sampling return of Chang’e-5 is provided. By processing the simulation data and measured data of Chang’e-3 lunar probe, it could be assumed that the accuracy of trajectory determination of soft landing is better than 100 meters in Chang’e -3 lunar probe data processing. It appears that the difference between the endpoint of the trajectory and the location got from the image processed by NASA′s lunar reconnaissance orbiter(LRO) is less than 50m. It demonstrates the effectiveness of the method of soft landing trajectory determination provided by the paper is verified.

Key words: Chang’e-3, Chang’e-5, Soft landing, Sampling return, Orbit determination, Nominal trajectory guidance

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