多径衰落的计算机随机模拟

The computer Random Simulation of Multi-path Fading on Line-of-sight Microwave Links

在球面分层大气的假定下,用大气层结折射线、直接射线及地反射线的三射线物理模型,综合考虑天线方向图、地面粗糙度、地球扩散因子及电路余隙因子对射线幅度的影响。根据实测大气统计模型,用计算机随机模拟研究了地形、气象诸因素对平衰落统计特性的影响,及空间分集、频率分集对平衰落的改善效果。

Under hypothesis of spherically stratified layer,we make use of a three-ray Physical model of a multi-path refractive ray,a direct ray and a earthreflected ray. Antenna directional diagram,roughness of earth's surface,earth divergence factor and clearenee effecting on the ray amplitude are synthetically consindered.setting up atm- ospheric statistical model based on experimental measurements,making use of computer random simulation,we research that terrain and meterorological factors (?)ffecting on statistical characteristics of flat fading.The improvement factors for both space and frequency diversity reception on flat fading is discussed.