观测质量对北斗系统集中式实时自主导航的影响分析

介绍集中式实时自主导航参数分解滤波的基本原理及星间链路观测值的仿真方法。基于仿真北斗系统全星座的星间链路测量数据，进行60 d的集中式实时自主导航解算，论证观测噪声及残余系统误差对北斗系统3类卫星自主导航精度的影响。结果表明，观测噪声对自主导航精度无显著影响；残余系统误差中的固定偏差为影响自主导航精度的主要成分，且残余系统误差对自主导航精度影响较大，需要对其认真检校。另外，观测噪声及残余系统误差的变化对北斗系统3类卫星自主导航精度的影响无显著差异。

Influence of Observation Quality on Centralized Real-Time Autonomous Navigation for BDS

This paper introduces the principle of centralized real-time autonomous navigation(AutoNav) based on the parameter decomposition filter, and also presents the simulation method for inter-satellite cross-link observations. Based on the simulated observations for the simulated constellation of BDS, 60 days’ AutoNav is performed. The influence of observation noise and residual systematic errors to the precision of AutoNav is analyzed. The results indicate that observation noise has no distinct effect on the precision of AutoNav. However, the residual systematic error has a great influence and needs to be carefully corrected. Otherwise, there are no differences regarding the influence of the observation noise and residual systematic error on GEO, IGSO and MEO satellites.