Journal of Astronautics ›› 2017, Vol. 38 ›› Issue (7): 728-734.doi: 10.3873/j.issn.1000-1328.2017.07.008

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A Method of Two Way Satellite Ground Time Synchronization Under Inter Satellite Links System

LV Hong chun, LU Xiao chun, WU Jian feng   

  1. 1. National Time Service Center, Chinese Academy of Sciences, Xi’ an 710600, China;
    2. University of Chinese Academy of Sciences, Beijing 100049, China;
    3. Key Laboratory of Precision Navigation and Timing Technology, Chinese Academy of Sciences, Xi’an 710600, China;
    4. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, China;
    5. School of Electronic, Electrical and Communication Engineering, University of Chinese Academy of Sciences, Beijing 101408, China)
  • Received:2017-03-20 Revised:2017-05-09 Online:2017-07-15 Published:2017-07-25

Abstract:

The mathematical model of the two-way satellite-ground time synchronization is deduced, the method of the two-way satellite-ground time synchronization under inter-satellite links system is proposed, and the relative satellite-ground clock offset of the new-generation BeiDou navigation satellite and the Xi’an station during the orbit test is calculated. The parameters are fitted by the time length of 1 week, 1 day and 1 hour, respectively, and the short-term frequency stability analysis is performed, which verifies the accuracy and performance of the two-way satellite-ground time synchronization of inter-satellite links mode in the experimental stage, and the limited data shows that under the fitting time of 1 week, 1 day and 1 hour, the accuracy of the two-way satellite-ground time synchronization of inter-satellite links mode are up to 3.42 ns, 0.30 ns and 0.15 ns, respectively. And the 10000 s frequency stability is better than 8×10 -14 .

Key words: Inter satellite links (ISL), Satellite ground time synchronization, Time division, BeiDou navigation satellite system (BDS)

CLC Number: