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为了充分利用未来的全球导航卫星系统(GNSS)中多星座多频点的卫星信号,使接收机自主完好性监测(RAIM)技术能够用于垂直引导进近(APV)飞行阶段,提出了一种基于双星故障假设的多星座RAIM算法。算法将全部可见卫星分为3组,分别计算定位解,对3个分组定位解加权平均作为最终的定位解,通过迭代寻找最优加权因子,使得在满足定位精度要求的前提下极大化算法的可用性。仿真结果表明:该算法能够以100%的可用性支持APV-Ⅰ飞行阶段,以高于99%的可用性支持APV-Ⅱ飞行阶段。
In order to make full use of multi-constellation multi-frequency satellite signals in future Global Navigation Satellite System (GNSS) so that receiver autonomous integrity monitoring (RAIM) technology can be used in vertical pilot approach (APV) flight stage, a Multi - Constellation RAIM Algorithm Based on Double Star Fault Hypothesis. The algorithm divides all visible satellites into three groups and calculates the positioning solution respectively. The weighted average of the three grouping positioning solutions is taken as the final positioning solution, and the optimal weighting factor is found through iteration so as to maximize the algorithm under the premise of meeting the positioning accuracy requirement Availability. The simulation results show that this algorithm can support APV-I flight stage with 100% availability and APV-II flight stage with availability above 99%.