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中文摘要：
在分析高空平台站通信系统覆盖特性、链路损耗特性与降雨衰减特性的基础上，针对低仰角动态环境下的信道特性，根据传播散射理论，通过引入阴影系数，建立了一个包含好状态和坏状态的混合状态衰落统计模型．针对不同状态得到了模型高阶统计特性的表达式，并将模型的一阶和高阶统计特性通过实测数据进行验证，发现两者吻合良好．证明该模型可用于高空平台站通信电波传播特性的分析、调制及编码方案的优化和通信系统性能的仿真等．
英文摘要：
In this paper, first, the coverage, link loss and rain attenuation characteristics of high-altitude platform station （HAPS） communications systems are analyzed. Next, according to the channel characteristics of the dynamic environment with a low elevation angle and on the basis of the propagation seaterring theory, a statistical mixedstate fading model is proposed by introducing a shadow coefficient. Then, the higher-order statistical characteristics of the model in different states are formulated. Finally, the first-order and higher-order statistical characteristics of the model are compared using the measured data, exact accordance being revealed. It is thus concluded that the proposed model is effective in analyzing the propagation characteristics, optimizing the modulation and coding schemes and simulating the performance of HAPS communication systems.
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