海面舰船复合场景电磁散射模型与应用研究

开展海上舰船目标复合场景电磁散射机理和模型研究对于海洋环境中的船只监测以及分类识别有着重要的指导意义。面向高分辨雷达对海探测需求，介绍了研究团队近年来针对海洋环境提出的一系列电磁散射模型，具体包括：1)针对海面电磁散射提出的毛细波修正面元散射模型，面元化的简化小斜率近似模型以及针对高海情海面提出的考虑破碎波影响的面元化散射模型；2)针对电大尺寸目标提出的几何光学/物理光学混合算法及其硬件加速实现方案；3)针对船海复合场景提出的面元散射模型与几何光学/物理光学混合方法。最后给出了电磁散射模型在海杂波特性仿真分析、电大尺寸目标雷达特性分析、目标及船海复合场景高分辨合成孔径雷达图像仿真与目标探测等中的应用。

Research on electromagnetic scattering model for a composite

The research on electromagnetic scattering mechanism and models of a ship-ocean scene has important guiding significance for ship monitoring and classification and identification in a complex marine environment. In this paper, aiming at the sea detection requirements of high resolution radar, a series of electromagnetic scattering models for the marine environment proposed by the research team in recent years are introduced, including:1)The capillary wave modified facet-based scattering model and the facet-based simplified small slope approximation are proposed for analysing the electromagnetic scattering from sea surfaces. In addition, a facet-based scattering model considering the influence of breaking waves is proposed for analysing the scattering from sea surfaces under high sea states; 2)The combination of the geometrical optics and the physical optics (GO/PO) is proposed as well as different acceleration methods for the scattering problem of electrically large targets; 3)In order to solve the scattering from a composite ship-ocean scene, the combination of the facet-based scattering models and the GO/PO hybrid method was proposed. Moreover, the application of the proposed models in sea clutter simulation, radar characteristics analysis of electrically large size targets, high resolution synthetic aperture radar image simulation and target detection in composite ship-ocean scenes are also given to show the potential application of the proposed scattering models.