【作者】 王乾海； 许小剑；

【Author】 Wang Qianhai;Xu Xiaojian;School of Electronics and Information Engineering, Beihang University;

【机构】 北京航空航天大学电子信息工程学院；

【摘要】 针对动态箔条云与时变海面耦合散射特性建模问题,提出了一种考虑粗糙下垫面影响的箔条云雷达多径散射回波信号仿真方法。根据箔条空气动力学特性建立了动态箔条云扩散模型,并结合箔条云电磁散射特性和时变海面复反射系数计算,建立了箔条云与海面耦合散射的四路径回波模型。仿真并分析了自由空间和复合场景中箔条云电磁散射特性的差异,对比了不同极化方式和不同海况下海面多径效应对箔条云雷达散射截面(radar cross section,RCS)及一维高分辨率距离像(high resolution range profiles, HRRP)随雷达观测时间变化特性的影响。更多还原

【Abstract】 In this paper, the coupling backscattering characteristics of dynamic chaff clouds above timevarying sea surface is studied. A simulation method of the radar multipath backscattering signatures for chaff clouds considering the influence of rough underlaying surface is proposed. A dynamic chaff clouds expansion model is established based on the chaff aerodynamic properties, and a multipath echo model of coupling backscattering of chaff clouds above sea surface is developed by combining electromagnetic backscattering of chaff clouds with the time-varying sea surface complex Fresnel reflection coefficient.The differences in electromagnetic backscattering characteristics of chaff clouds in free space and in the composite scenarios are simulated and analyzed. The impacts of sea surface multipath effects on the timevarying characteristics of the radar cross section and the high resolution range profiles of chaff clouds are studied for different polarization and sea states.更多还原