利用条件平差实现导航星座自主守时方法  

Auto-Timing of Satellite Navigation System Using Conditional Estimate

作　　者：徐冬梅[1] 杨龙[1] 

机构地区：[1]装备指挥技术学院,北京101416

出　　处：《中国空间科学技术》2006年第6期18-23,共6页Chinese Space Science and Technology

摘　　要：针对导航星座自主导航系统的重要组成部分———自主守时系统,提出了一种简便易行的新算法:根据星间测距数据,采用条件平差进行自主守时计算;并且介绍了此方法基本原理和实现思路。自主守时仿真计算表明,此方法守时同步误差不累积,距离测量误差0.1m时,时间同步误差均方根小于0.4m。Capability of the active satellite navigation system is to estimate clock and position error autonomously. The capability is called as autonomous navigation. The algorithm of estimating the each satellite clock error was focused. Generally, in order to autonomous navigating, each satellite makes pseudorange measurements to other visible satellites. Then these measurements are cross -- linked to every satellites, so each can calculate every clock error. A new method of conditional estimating was introduced to calculate the clock error. The principle and approach of the method was discussed in detail. The synchronization error which was the difference between each estimated error was less than 0.4m （RMS）.

关 键 词：自主守时 最小二乘法 参数估计 自主式导航卫星导航 

分 类 号：TN967.1[电子电信—信号与信息处理]