复杂场景散射特性的参数化仿真模型

Parameterized Simulation Model for Scattering Characteristics of Complex Scenes

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 reflectiondistribution 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(radarcross 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0.109 7,验证了所提算法的可行性。

Abstract:

Addressing the real-time simulation demands for electromagnetic scatteringcharacteristics in complex scenes, a parameterized simulation model of scattering characteristicsbased on the scattering center method was introduced. Firstly,based on the digital elevationmodel (DEM) data, Monte Carlo method was used to supplement roughness information, anda complex terrain network model was constructed. Subsequently, a parameterized scatteringmodel was established by using the bidirectional reflection distribution function modifiedattribute scattering center (BRDF-ASC) model. Numerical experimental results reveal that theproposed 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 actualsynthetic aperture radar (SAR) image of a large harbor, the change detection rate (CDR) of theparameterized scattering model’s SAR image is 0.109 7, which confirms the feasibility of theproposed algorithm.