宇航学报 ›› 2017, Vol. 38 ›› Issue (7): 728-734.doi: 10.3873/j.issn.1000-1328.2017.07.008

• 制导、导航、控制与电子 • 上一篇    下一篇

星间链路体制下的星地双向时间同步方法

吕宏春,卢晓春,武建锋   

  1. 1. 中国科学院国家授时中心,西安 710600;2. 中国科学院大学,北京 100049;
    3. 中国科学院精密导航定位与定时技术重点实验室,西安 710600;4. 中国科学院大学天文与空间学院,北京 101408;
    5. 中国科学院大学电子电气与通信工程学院,北京 101408
  • 收稿日期:2017-03-20 修回日期:2017-05-09 出版日期:2017-07-15 发布日期:2017-07-25

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

摘要:

推导了星地双向时间同步的数学模型,提出了在星间链路体制下进行星地双向时间同步的方法,计算了新一代导航试验卫星与西安站的相对钟差,通过对计算结果分别按1周、1天和1小时时长进行参数拟合,以及进行短期频率稳定度分析,验证了试验阶段星间链路体制下星地双向时间同步的精度和性能。结果表明,1周、1天和1小时的拟合时长星间链路体制下的星地时间同步精度分别达到了3.42纳秒、0.30纳秒和0.15纳秒,10000秒频率稳定度优于8×10 -14 。

关键词: 星间链路, 星地时间同步, 时分体制, 北斗卫星导航系统

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)

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