介质和腔体结构复杂目标散射中心建模研究

Dielectrics and cavities are common structures of modern or future radar targets. Study on scattering centers of these targets are of great significance for the applications of automatic target recognition and Radar image interpretation. Electromagnetic computation and scattering mechanism analysis are quite difficult for these targets. Complex scattering characteristics of these targets cause their scattering centers are distinct from those of traditional metal targets. They arise in group or array or irregular configurations, which is different from the common ‘center’ configuration. This project aims to develop investigations on scattering centers of these targets, and propose an extracting method based on equivalent surface electric and magnetic currents, and then build practical scattering center models with definite physical meanings. The research results of this project are of significance in theory and application for developing new techniques for modern or future radar, such as new radar system design, automatic target recognition and Radar image interpretation.

介质和深腔是当今和未来雷达目标常见结构，此类目标的散射中心模型研究对自动目标识别、雷达图像解译具有深远的基础研究意义。带有介质和深腔结构的复杂目标，存在散射计算复杂度高、散射机理分析困难等问题，其复杂的散射特性导致此类目标的散射中心与传统金属目标的散射中心有本质不同。通过前期对介质球和圆柱腔的散射中心研究发现，此类目标的散射中心超越了传统意义上 “中心”概念，往往以组或阵或不规则排列等形式呈现。本项目旨在对带有介质和深腔结构的复杂目标的散射中心建模展开深入研究，提出基于等效电磁流几何分区、成分分解的散射中心的提取方法，建立物理含义明确、简洁实用的散射中心数学模型表示。研究结论对雷达新体质研制、目标识别和雷达图像解译等具有重要理论和应用价值。

介质和深腔是当今和未来雷达目标常见结构，此类目标的散射中心模型研究对雷达目标识.别、雷达图像解译具有深远的基础研究意义。带有介质和深腔结构的复杂目标，存在散射计算复杂度高、散射机理分析困难等问题，其复杂的散射特性导致此类目标的散射中心与传统金属目标的散射中心有本质不同，其雷达图像特征超越了传统意义上独立、离散分布的散射强点概念，往往以组或阵或不规则排列的散射中心形式呈现，因此雷达图像呈现出有别于金属目标的独特特征。本项目旨在对带有介质和深腔结构的复杂目标的散射中心建模展开了深入研究，提出了介质、深腔、薄涂覆等结构的散射中心模型，该模型的物理含义明确、简洁实用。本项目将所建立的散射中心模型用于高分辨成像，成像结果可以精确重构目标的图像特征，而且图像特征所代表的目标物理特性可由散射中心进行解译，这些研究结果对目标特征识别和雷达图像解译等具有重要应用价值。