平流层通信站分集的抗雨衰减性能

通过模拟雨区的三维结构，利用几何方法获得平流层通信分集增益数据，建立了平流层通信站分集的经验模型，并用实验数据对模型进行了检验，结果表明，站间距离和路径仰角是影响平流层通信站分集性能的主要因素，工作频率和站间连线方位角对分集性能的影响较小；所建模型在诸参数范围内有较好的精度，给出的方法和参数有利于平流层通信站分集系统的优化设计。

An Empirical Model of Site Diversity for Stratospheric Communications

An empirical model of site diversity for stratospheric communications was proposed with diversity gain data for stratospheric communications that are obtained by simulating three dimention spatial structures of rain cells using geometry method. The resulting model reproduced the entire experimental data with an rms error of 1.63 dB. The presented model shows that both of the distance between sites and the elevation angle of the single path dominate the dependence of the diversity gain, while the dependence on the link frequency and the baseline orientation is small. The presented method and parameters are valuable for the optimal design of the site diversity system.