宇航计测技术

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导航星座自主导航的守时算法研究

易航1,2；仲崇霞1，2   

  1. 1、北京无线电计量测试研究所，北京 100039；
    2、计量与校准技术国防科技重点实验室，北京 100039
  • 出版日期:2012-10-15 发布日期:2012-10-15

Research on Time Keeping Algorithm of the Autonomous Navigating of Navigation Constellation

YI Hang1,2；ZHONG Chong-xia1,2   

  1. 1、.Beijing Institute of Radio Metrology and Measurement, Beijing 100039;
    2、Science and Technology on Metrology and Calibration Laboratory， Beijing 100039
  • Online:2012-10-15 Published:2012-10-15

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摘要： 导航星座自主导航是提高卫星导航系统生存能力的一个重要方面，而实现导航星座自主导航的前提在于自主守时，星上综合原子时的计算则是自主守时的关键技术之一。本文分别研究了星上综合原子时计算的传统加权平均算法与卡尔曼滤波算法，并分别做了仿真实验，结果表明，通过合理设置，两种方法均可保持60d内自主守时25ns。

关键词: 导航星座, 时间尺度, 自主守时, 加权平均, 卡尔曼滤波

Abstract: Autonomous timekeeping is one of the key techniques for the autonomous navigation of navigation constellation which plays an important role in improving the viability of the navigation constellation, while the algorithm of jointed atomic time scale on board is the key of autonomous time-keeping. In this paper, both the two algorithms based on weighted average and EKF are used in the calculation of jointed atomic time scale on board. The simulation results prove that both the two algorithms can keep the clock error within 25ns in a period of 240 days.

Key words: Navigation constellation, Time scale, Autonomous time-keeping, Weighted average

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