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在全球导航卫星系统中,多颗卫星同时发生故障的概率会随着观测卫星数的增加而增加,从而,在接收机自主完好性监测中需考虑多星故障的处理.针对故障检测比故障排除简单、且故障检测率比故障排除率高的特征,以故障检测为基础,提出了一种新的多星故障排除方法——随机搜索法.该方法采用二进制对观测卫星进行编码,通过随机初始化方式获得初始无故障星座,再通过逐步搜索未选卫星方式来得到最终的含有最多无故障卫星的星座,实现故障排除功能.仿真结果表明:大部分情形下,新方法能获得99%以上的故障排除率,既能进行单星故障排除,也能进行多星故障排除,能有效满足全球导航卫星系统关于自主完好性的要求.
In the global navigation satellite system, the probability of simultaneous failure of multiple satellites increases with the number of observing satellites, so multi-star failure processing needs to be considered in the autonomous integrity monitoring of receivers. Simple and fault detection rate than the high rate of troubleshooting features to fault detection based on the proposed a new multi-star troubleshooting method - random search method. This method uses binary to encode the observation satellite, through random initialization Way to obtain the initial no-fault constellation, and then search for the final constellation with the most no-fault satellites through the step-by-step search of the unselected satellites to implement the troubleshooting function. The simulation results show that in most cases, the new method can obtain over 99% Exclusion rate, both for single-star troubleshooting, but also for multi-star troubleshooting, can effectively meet the global navigation satellite system on the autonomy of the requirements.