抛物方程法预测复杂地海环境中的电波传播  

Prediction of Propagation in Complex Land-Ocean Environments Using the Parabolic Equation Method

作　　者：关晓伟 郭立新[1] GUAN Xiao-wei;GUO Li-xin(School of Physics,Xidian University,Xi’an 710071,China)

机构地区：[1]西安电子科技大学物理学院,西安710071

出　　处：《微波学报》2023年第1期1-7,共7页Journal of Microwaves

基　　金：国家自然科学基金(61871457);国家自然科学基金创新研究群体科学基金(61621005)。

摘　　要：为了分析对流层环境中影响电波传播的主要因素,文章基于抛物方程模型研究了复杂地海环境下的电波传播特性,综合考虑粗糙海面Miller-Brown近似、地形遮蔽法、分段线性平移变换法等处理方法,分析了海上岛屿、沿海城市、蒸发波导、发射天线参数、风速等因素对电波传播造成的影响。结果表明,电波传播损耗受蒸发波导、海岛高度和频率的影响较大,而远距离传播时受海面风速的影响较小,海岛的存在会使电波产生多径效应,而其遮蔽效应也会令传播损耗有所增加。此外,近海岸的地理环境同样对传播损耗的影响较大,而随着高度的增加,这种影响逐渐减小,因此,提高发射天线的高度可以有效延长探测距离。这些结果对雷达系统的设计和性能评估具有重要的指导意义。In order to analyze the main factors that affect the radio wave propagation in the tropospheric environment,the propagation characteristics of radio waves in complex land-ocean environment using the parabolic equation model is studied in this paper.The Miller-Brown approximation for rough sea surface,terrain masking approach and the piecewise linear shift map method are taken into account,and the effects of island,coastal city,evaporation waveguide,transmission antenna parameters and wind speed on the propagation of radio waves are analyzed.The results show that the propagation loss is greatly affected by evaporation duct,island′s height,and frequency,while it is less affected by the wind speed over the sea in long-distance propagation.Besides,the existence of islands will cause multipath effect,and its shadowing effect will also increase the propagation loss.In addition,the coastal geographical environment also has a greater impact on the propagation loss,and with the increase of height,the effect gradually decreases.Therefore,increasing the height of the transmitting antenna can effectively extend the detection range.These results have important guiding significance for the design and performance evaluation of radar systems.

关 键 词：对流层 电波传播 抛物方程 地海环境 粗糙海面 

分 类 号：TN011[电子电信—物理电子学] O175.26[理学—数学]