复杂场景散射特性的参数化仿真模型  

Parameterized Simulation Model for Scattering Characteristics of Complex Scene

作　　者：张尊[1] 牟媛 贺新毅 曾砾堂 ZHANG Zun;MOU Yuan;HE Xinyi;ZENG Litang(Beijing Institute of Technology,Beijing 100081,China;Shanghai Radio Equipment Research Institute,Shanghai 201109,China;Unit 93119 of People’s Liberation Army of China,Jiuquan 735000,Gansu,China)

机构地区：[1]北京理工大学,北京100081 [2]上海无线电设备研究所,上海201109 [3]中国人民解放军第93119部队,甘肃酒泉735000

出　　处：《制导与引信》2024年第1期43-52,共10页Guidance & Fuze

基　　金：国家自然科学基金(62201036);电波环境特性及模化技术重点实验室开放课题(202102005)。

摘　　要：针对复杂场景电磁散射特性的实时仿真需求,提出了一种基于散射中心的散射特性参数化仿真模型。首先基于数字高程数据,利用蒙特卡罗法补充粗糙度信息,构建复杂地形网格模型;再利用双向反射分布函数修正的属性散射中心(bidirectional reflection distribution function modified attribute scattering center,BRDF-ASC)模型建立参数化仿真模型。数值实验结果表明:所提算法仿真的典型山峰和沙丘地形的雷达散射截面积(radar cross section,RCS)与物理光学(physical optics,PO)法仿真的RCS的均值误差低于3.6 dBsm;与大型海港的实测合成孔径雷达(synthetic aperture radar,SAR)图像进行对比,其参数化散射模型仿真SAR图像的变更检出率为0.1097,验证了所提算法的可行性。Addressing the real-time simulation demands for electromagnetic scattering characteristics in complex scenes,a parameterized simulation model of scattering characteristics based on the scattering center method was introduced.Firstly,based on the digital elevation model(DEM)data,Monte Carlo method was used to supplement roughness information,and a complex terrain network model was constructed.Subsequently,a parameterized scattering model was established by using the bidirectional reflection distribution function modified attribute scattering center(BRDF-ASC)model.Numerical experimental results reveal that the proposed algorithm achieves a mean error of radar cross section(RCS)below 3.6 dBsm for typical hill and dune compared with the physical optics(PO)method.Compared with the actual synthetic aperture radar(SAR)image of a large harbor,the change detection rate(CDR)of the parameterized scattering model’s SAR image is 0.1097,which confirms the feasibility of the proposed algorithm.

关 键 词：参数化模型 复杂场景 双向反射分布函数 合成孔径雷达成像 

分 类 号：TN957.52[电子电信—信号与信息处理]