多星座组合导航系统自主完好性监测方法研究

Research on the Autonomous Integrity Monitoring Algorithm for the Multiple Constellations Navigation System

提出一种“VGC+BIT”的方法分析多故障情况下多星座组合导航系统的自主完好性监测性能。该方法基于现有GPS观测数据构建“准现实”的GPS/Galileo组合导航环境,可有效实现对多故障情况下GPS/Galileo组合系统完好性监测性能的分析。应用该方法计算GPS/Galileo组合导航系统中同时存在1~4个故障时的故障检测(FD)和排除(FDE)可用率。计算结果表明,在北京和上海两地,即使出现分布情况最坏的4个故障星,航路阶段FD和FDE的可用性仍大于99%。

An algorithm called 'VGC+BIT' is presented in this paper to analyze the integrity monitoring performance in the multi-fault scenario of GPS/Galileo.The algorithm can be used to build 'real' GPS/Galileo constellations based on the real GPS data,and it is efficient to perform the integrity monitoring performance analysis.The availability rate of the fault detection and exclusion with up to four simultaneously failed satellites is computed by this algorithm in the 'real' GPS/Galileo constellations.The result demonstrates that in Beijing and Shanghai even in the worst case that four faults exist the availability rate in the route phase is still over 99%.