The ionosphere and troposphere are main error sources of satellite navigation system measurement and main factors of COMPASS availability. The influence of the ionosphere and troposphere delay error model on the RAIM availability of COMPASS is analyzed in simulation where ephemeris datum is adopted, and especially the influence of different troposphere models on RAIM availability in civil aviation is analyzed. The experiment at results shows that the delay error of ionosphere and troposphere changes from 0 to 14.555 9 m and 0 to 23.779 6 m correspondingly. And for the non-precision approach stage of civil aviation, when Saastamoinen model, UNB3 model and Hopfield model are used as the troposphere model of COMPASS respectively, the RAIM availability is 99.308%, 92.041 5% and 100% corre-spondingly. So it is more suitable that Hopfield model is used as the troposphere model of COMPASS and the 99.9% RAIM availability requirement in civil aviation can be achieved using this model.%电离层和对流层是卫星导航系统测量的主要误差源，也是北斗卫星导航系统可用性变化的重要因素。采用星历数据仿真分析了电离层和对流层延迟误差模型对北斗导航系统RAIM可用性的影响，特别分析了不同对流层模型对民用航空的影响。实验表明电离层和对流层的延迟误差分别为0~14.5559 m及0~23.7796 m，且在民用航空的非精密进近阶段，用 Saastamoinen 模型、UNB3模型及 Hopfield 模型分别作为北斗的对流层误差模型的RAIM可用性分别为99.308%、92.0415%和100%，相比较Hopfield模型更适合作为北斗卫星导航系统的对流层模型，能满足民用航空的99.9%RAIM可用性要求。
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