基于自适应动态平差的导航星座自主时间同步方法

摘要

基于近代平差理论系统地讨论导航星座的自主时间同步问题,建立了自主时间同步的空间自由网平差模型,提出基于星间双向测距链路和原子钟模型的自适应动态平差算法.该算法对污染测量值采用抗差M估计,而对各卫星钟差模型采用不同的自适应因子调节.给出了简要的理论分析和关键的仿真技术.结果表明,该算法能有效地控制观测误差和模型误差的影响,实现星间高精度自主时间同步.%The problem of time synchronization of navigation constellation Autonomous Navigation ( AutoNav) is discussed systematically based on modern adjustment theory. The adjustment models for autonomous time synchronization program are built, and an adaptively dynamic adjustment algorithm is proposed based on intersatellite two-way ranging link and atomic clock dynamic model. The robust M-estimation and adaptively sequential adjustment with different adaptive factors are integrated in this method. The theoretical analysis and critical simulation technique are presented. The result indicates that the proposed algorithm can restrict the effect of observation error and model error, thus implementing the autonomous time synchronization between satellites highly-accurately.