粗糙衰减因子在电磁波蒸发波导传播中的应用

为了研究电磁波在蒸发波导中的传播问题,结合我国海域蒸发波导实际情况,推算出其最大陷获角,仿真分析了Miller-Brown粗糙衰减因子随风速和电磁波传播方向与海面夹角的变化关系。运用射线描迹法进行仿真实验,结果表明:只要已知蒸发波导高度,就可得到海面粗糙衰减因子与风速的直接关系。采用高斯拟合模型,给出粗糙衰减因子的简化表达式,解决了模型中Bessel函数展开形式复杂、求解困难的问题,有利于快速获得海面粗糙状况,对分析粗糙海面对电磁波传输衰减影响有借鉴意义。

Roughness Attenuation Factor in the Useof Electromagnetic Wave Propagationin Evaporation Duct Environment

In order to study the electromagnetic wave in the evaporation duct propagation better, the maximum trapped angle for electromagnetic wave was derived in this paper, combined with the actual situation of China Sea area. The influence of Miller-Brown roughness attenuation factor of wind speed and the angle between electromagnetic wave propagation direction and the sea surface, and the change relations between them were analyzed by simulation. Using ray tracing method for simulation experiment and the results showed that wind speed had direct relationship with roughness attenuation factor since the height of the evaporation duct was certain. Then the gauss fitting was used to simplify the result. The simplified expression solves the problems of Bessel function expansion form complex and solving difficult. It helps us to get the rough sea condition quickly and the further researchers can draw lessons from it.