摘要
海上的湍流大气会引起海上大气波导传播中能量的严重泄漏,进而影响雷达对目标回波信号的正确判断。文中通过利用微波测距机进行连续测距,反算出海面上大气折射率的起伏变化,继而得到能够反映湍流特征的折射率随机扰动项,再将折射率扰动项分别加入到抛物方程模型和射线追踪技术中进行了湍流环境下的传播损耗和射线轨迹计算。计算结果表明,在海上波导传播计算模型中考虑折射率扰动项,可以更加合理地进行雷达系统效应评估,准确地反映大气湍流对海上电波传播的影响。
Atmospheric turbulent fluctuations over sea can affect radar＇s estimate of the aim＇s echo signal, and lead to energy＇s great leakage out of the atmospheric duct. The distances were continuously measured by the tellurometer on the propagation path, and the atmospheric refractive index fluctuation over sea can be inversely calculated by the fluctuation of the distances, which used to calculate the random fluctuation component in refractive index. The random fluctuation component in refractive index is added separately to the calculation of propagation loss using PE model and trajectory using ray tracing technique. The results show that the duct propagation model added fluctuation can evaluate the radar system reasonable, and describe the influence of turbulence on ra- dio wave propagation over sea.
出处
《现代雷达》
CSCD
北大核心
2011年第2期13-17,共5页
Modern Radar
基金
中国电子科技集团公司技术创新基金资助项目
关键词
湍流
测距机
蒸发波导
抛物方程
射线追踪
turbulence
tellurometer
evaporation duct
parabolic equation
ray tracing
