摘要
大气波导是海洋大气环境中经常发生的一种异常大气折射结构,会对电磁波的传播路径和能量分布造成极大的影响。目前对于大气波导条件下电磁波传播特性的研究多数假定大气波导环境水平均匀。本文利用WRF模式对2016年1月1—4日一次强悬空波导过程进行模拟,结合电磁波传播抛物方程,探究悬空波导水平不均匀性对电磁波传播特性的影响。结果表明,当电磁波在传播路径上产生波导传播现象时,悬空波导水平不均匀条件下电磁波传播损耗与均匀条件下有明显不同,不能用水平均匀的波导环境代替整个传播路径上的波导环境;当电磁波传播路径上后半段路径存在悬空波导层时,由于波导层距离发射源较远,没有捕获到电磁波能量,因此悬空波导的存在对电磁波传播不产生影响,可以不考虑电磁波传播路径上修正大气折射率的水平变化。
Atmospheric duct is an abnormal atmospheric refraction structure that often occurs in marine atmospheric environment,which has a great impact on the propagation path and energy distribution of electromagnetic wave.Most of the studies on the propagation characteristics of electromagnetic wave assume that the atmospheric duct is horizontally homogeneous.In this paper,a strong elevated duct process from January 1 to 4,2016 is simulated by the WRF model,and combined with the parabolic equation of electromagnetic wave propagation,to explore the influence of horizontally inhomogeneous elevated duct on electromagnetic wave propagation.The results show that when the electromagnetic wave propagates in elevated duct,the electromagnetic propagation loss in the horizontally inhomogeneous elevated duct is obviously different from that in the horizontally homogeneous elevated duct,so the elevated duct environment on the whole propagation path cannot be replaced by the horizontally homogeneous elevated duct.When the elevated duct layer exists on the second half of the electromagnetic wave propagation path,because the elevated duct is far away from the emission source and does not capture the electromagnetic wave energy,the existence of elevated duct has no impact on the electromagnetic wave propagation,and the horizontal change of modified atmospheric refractivity on the electromagnetic wave propagation path can be ignored.
作者
丁一耕
李晓东
盛立芳
王文彩
Ding Yigeng;Li Xiaodong;Sheng Lifang;Wang Wencai(College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266100,China)
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2023年第6期30-42,共13页
Periodical of Ocean University of China
基金
国家自然科学基金项目(41975008)资助。
关键词
悬空波导
WRF模式
抛物方程
水平不均匀
传播损耗
elevated duct
WRF model
parabolic equation
horizontally inhomogeneous
propagation loss
