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本文对移动卫星通信的三种典型信道模型进行了完整的系统仿真，得出ＱＰＳＫ调制信号经过不同信道后的误比特率曲线，包括上／下行链路两次衰落的情况。经分析比较发现，信道的性能主要取决于信道参数，各种因素的影响可以归结到对这些参数的影响，而在非静止轨道移动卫星通信中，仰角是影响系统误码性能的重要因素。
In this paper, three kinds of typical channel models of mobile satellite communication are systematically simulated, and the bit error rate curves of QPSK modulated signals after different channels are obtained, including the case of double fading on uplink / downlink. The analysis shows that the performance of the channel depends mainly on the channel parameters. The influence of various factors can be attributed to these parameters. In non-geostationary orbit mobile satellite communications, the elevation angle is an important factor affecting system error performance.