支持垂直引导进近的多星座RAIM算法

Multi-constellation RAIM for approach with vertical guidance

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。

Receiver autonomous integrity monitoring（RAIM） can be used for approach with vertical guidance（APV） in anticipation of multi-constellation and multi-frequency signals in future global navigation satellite systems（GNSS）.This study analyzes a multi-constellation RAIM algorithm with simultaneous two-satellite faults.All satellites in view are divided into three groups and the final positioning solution is the weighted average of the three solutions calculated by each group separately.An optimal weight ratio is found iteratively,to maximize the algorithm availability while taking into account the accuracy requirements.Simulations show that this algorithm can be used for APV-I with an availability of 100% and can be used for APV-II with an availability of more than 99%.