粗糙地面上复杂目标的电磁散射特性

粗糙地面与复杂目标的耦合散射特性研究一直是雷达目标识别领域比较有应用价值的课题.针对粗糙地面与目标的复合电磁散射特性进行重构,包括复合模型的雷达截面积(radar cross section,RCS)特性以及合成孔径雷达(synthetic aper-ture radar,SAR)成像特性.首先,对复杂目标进行几何建模并对粗糙面进行数值建模,构建地面与目标的一体化几何模型.然后基于空间射线分集技术、射线追踪技术以及劈边结构识别算法分离出复合模型中散射中心,包括面结构和劈边结构对应的散射中心,基于属性散射中心模型正向的确定散射中心对应的各个参数,最终建立起粗糙地面上复杂目标的散射中心参数化模型.并通过对其重构的散射特性与实测结果进行对比,分析了地面与目标的耦合作用.研究对雷达目标识别领域具有很大的应用价值.

Research on Electromagnetic Scattering Characteristics of Complex Targets on Rough Ground Surfaces

Research on the coupling scattering characteristics between the rough ground and the complex target has always been a valuable subject in radar target recognition. In this paper, the composite electromagnetic scattering characteristics of rough ground and target are reconstructed, including the Radar Cross Section (RCS) characteristics and the imaging characteristics of Synthetic Aperture Radar (SAR) of the composite model . Firstly, the geometric model of the complex target and the numerical model of the rough surface are carried out to construct the integrated geometric model of the ground and the target. Then based on the space ray diversity technology, ray tracing technology and cleavage structure recognition algorithm, the scattering centers of the composite model are isolated, including the scattering centers of surface structure and the cleavage structure. Based on the form of the attribute scattering center model, the parameters corresponding to the scattering center are positively determined, eventually a rough surface complex target scattering center parametric model is established. By comparing the reconstructed scattering characteristics with the measured results, the coupling effect between the ground and the target is analyzed, which is of great significance in the field of radar target recognition.