粗糙海面对微波蒸发波导超视距传播影响研究

蒸发波导是形成海上微波超视距传播的主要因素,但传播情况敏感于海面粗糙度.在模拟粗糙海面上的传播情况时,提出使用一个能包含粗糙海面阴影效应影响的表面反射系数,再利用抛物方程法和射线光学法计算路径损耗.仿真分析了微波在浪高服从高斯统计分布的海面上传播时,路径损耗与蒸发波导高度及风速之间的关系,并与使用不包含阴影效应影响的粗糙海面反射系数的计算结果进行了比较.结果表明来自粗糙海面的反射是计算微波沿粗糙海面蒸发波导传播路径损耗的不可忽视的重要因素.

A Study of Rough Sea Surface Effects on Microwave Propagation Over-the-horizon in an Evaporation Duct

The important reason resulting in microwave propagation over-the-horizon above the sea is evaporation duct, but propagation condition is sensitive to the wind-driven sea-surface roughness. In this paper, a rough sea surface reflection coefficient incorporating shadowing effect is presented, and a hybrid parabolic equation and ray optics methods are described for propagation modeling. The modeled results for the evaporation duct propagation above rough sea surface following Gaussian statistics are presented....