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本文以雨介质为例，把离散随机介质视为一随机系统，应用系统辨识方法，得到了雨介质的传递函数矩阵模型和模型参数。利用雨介质的系统模型，结合电波传播理论，求出了雨介质的一个重要传输参数：路经平均雨滴尺寸分布。计算结果与实测值对比表明本文提出的方法是简便有效的。
In this paper, taking rain medium as an example, the discrete stochastic medium is regarded as a stochastic system. By using the method of system identification, the transfer function matrix model and model parameters of rain medium are obtained. Using the system model of rain media and the theory of radio wave propagation, an important transmission parameter of rain media is obtained: the mean raindrop size distribution. The comparison between the calculated and measured data shows that the proposed method is simple and effective.