导航星座的自主导航技术--卫星自主时间同步

基于星载原子时钟频率稳定性的Allan方差表达，建立系统状态方程，并以星间双向测量伪距差作为基本观测量，组成系统测量方程，从而可以设计适用于导航星座卫星时间同步的Kalman滤波算法。系统仿真结果表明：通过对星间双向测量数据的滤波处理，能够实现星座卫星时间精密同步。

Autonomous Navigation Technology for Navigation Constellation:Autonomous Synchronization among Satellites

The stability of the frequency of an atomic clock can be generally expressed in an quantificational manner using Allan variance. Based on this, system state equations of clocks are established in this paper. Moreover, the system measurement equations are got, using the pseudorange differences between two satellites as basic measurements. A Kalman filtering algorithm applicable to inter-satellite synchronization can thus be easily designed. System simulation results show that precision synchronization among satellites of the constellation is achieved by processing inter-satellite measurement data with on-board Kalman filters.