摘要
蒸发波导能够部分陷获电磁波的传播,从而改变电磁波的传播特征,形成超视距传播,但是粗糙海面对电波传播的影响会削弱这种传播特性。基于抛物方程(PE)模型,采用包含粗糙海面阴影效应的反射系数来计算电波传播损耗,仿真结果略大于采用Miller-Brown模型做海面粗糙度修正的传播损耗值。表明当波长与浪高可比拟甚至远小于浪高时,粗糙海面的阴影效应对电波传播的影响不可忽略。
The evaporation duct can partly trap electromagnetic waves,change propagation characteristics of radio wave,and eventually resulting in microwave propagation over-the-horizon above the sea,however,the roughness of the sea surface can weaken this effect.This paper considers the reflection factor that includes the shadow effect on the rough sea surface,then use PE model to simulate propagation loss,which is bigger than that simulated by Miller-Brown model.It shows that when wave length is shorter or near to the wave height,the shadowing effect on the sea surface cannot be neglected for the radio wave propagation.
出处
《无线电工程》
2012年第3期38-40,46,共4页
Radio Engineering
关键词
粗糙海面
电波传播
抛物方程
阴影效应
传播损耗
rough sea surface
electromagnetic wave propagation
parabolic equation
shadow effect
propagation loss
