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在假设阴影衰落对接收信号直射分量的影响符合对数正态分布、多径衰落对接收信号的干扰符合瑞利分布的情况下 ,给出了接收信号包络变化的电平通过率和平均衰落持续时间的表达式 .利用数值分析方法给出了轻阴影、重阴影和混合阴影衰落环境下 ,平流层通信衰落信道接收信号包络的概率密度分布、电平通过率和平均衰落持续时间的数值 .对于当前没有平流层通信实测数据时进行平流层通信系统性能仿真等方面的研究具有重要意义
Under the assumption that the influence of shadow fading on the direct component of the received signal meets the logarithm normal distribution and the interference of multipath fading to the received signal conforms to the Rayleigh distribution, the level passing rate and the average fading of the received signal envelope change Duration, the numerical expressions of the probability density distribution, the level pass rate and the average fading duration of the received signal envelope of the stratospheric communication fading channel are given under the conditions of light shadow, heavy shadow and mixed shadow fading It is of great significance to research on the performance simulation of stratospheric communication system when there is no actual measurement data of stratosphere communication