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蒸发波导环境下风浪对电磁波传播影响的数值模拟研究
闫西荡, 杨坤德
西北工业大学
摘要:
蒸发波导是一种特殊的大气波导,在其中传播的电磁波信号会被陷获在近海大气层中,实现超视距传播。受海面上温湿度、风速、微波频率等因素的影响,海洋蒸发波导环境中的微波传播特性起伏变化很大,规律十分复杂。以往的工作主要通过计算这些气象因素对蒸发波导条件下大气折射率剖面的影响来分析它们对路径损失的作用,其结果与实验数据仍有较大差异。文中则在一定的蒸发波导条件下,利用一维分形海面模型产生海面“地形”,将其作为抛物方程电磁波传播模型的边界条件进行计算,得到相应的路径损失,并与传统计算方法进行对比,分析了不同蒸发波导高度、不同频率及不同接收天线高度时的数值模拟情况,可为舰艇通信系统或者雷达系统的设计提供相应的依据。
关键词:  蒸发波导  分形海面模型  抛物方程  电磁波传播  雷达设计
DOI:10.11693/hyhz20190700129
分类号:
基金项目:中央大学基础研究基金
Study on Influence of Wind Speed on Electromagnetic Wave Propagation under Evaporation duct condition Based on Sea Surface Model
Yan Xidang, Yang Kunde
Northwestern Polytechnical University
Abstract:
Evaporation duct is a kind of atmospheric ducts in which electromagnetic wave could be trapped to achieve over-the-horizon propagation. Affected by factors such as temperature and humidity, wind speed and microwave frequency above the sea surface, the characteristics of microwave propagation in the ocean evaporation duct environment are very complicated. Former works focus mainly on the effects of these meteorological factors on the refractive index profile of the evaporation duct, and thus the influence on propagation path loss could be analyzed. The calculated results are quite different from the experimental data. In this paper, a one-dimensional fractal sea surface model is used to generate sea surface “topography”, and the results are taken as the input of the parabolic equation propagation model. The corresponding path loss results are compared with the ones using traditional method. Results under different evaporation duct heights, frequencies and receiver heights are analyzed. The conclusion of the paper could be applied to the design of ship communication system or radar system.
Key words:  evaporation duct  fractal sea surface model  parabolic equation  electromagnetic wave propagation  radar design
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