This paper introduced two RAIM algorithms include PL method and BIT method which were proposed for identifying simultaneous two-faulty satellites.Simulated ground grids, computed and compared the results of RAIM availability and ratio of fault detection.Through comparison and analysis, how to describe the relationship between the statistics and positioning bias, and how to deal with the infection of different measurement noise is the keys for identifying simultaneous two or more faulty satellites availably.%分析和比较了用于检测两颗卫星故障的偏差完好性风险(bias integrity threat,BIT)法和保护限值(protection level,PL)法两种RAIM算法.通过数据仿真,对用不同方法检测卫星故障的可用性及故障检测率进行比较,并分析了两种方法存在差异的理论依据.通过分析比较,说明在未来接收机处理多颗卫星同时出现故障的情况时,如何更精确地描述统计检测量与定位偏差的关系以及如何处理不同测量噪声的影响是BAIM算法可用性及有效性的关键.
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