基于非理想散射特性的中段目标窄带雷达成像反演技术

项目名称： 基于非理想散射特性的中段目标窄带雷达成像反演技术

项目编号： No.61271442

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 魏玺章

作者单位： 中国人民解放军国防科学技术大学

项目金额： 75万元

中文摘要： 近年来，随着对中段目标非理想散射特性的深入认识，已发展的窄带成像算法因其散射中心时频多普勒不再满足正弦形式假设而难以应用。为进一步提升窄带雷达在中段目标成像、特征反演、识别等方面的能力，拓展其在目标探测中的优势，特提出本项目。项目针对有翼、旋转对称等典型中段目标，在弹头全极化非理想散射中心建模的基础上，构建不同类型散射中心进动时频多普勒解析模型，借助n维广义Radon变换及其逆变换等数学手段，重点突破基于进动时频特性和层析技术的两大类窄带雷达成像反演方法；为进一步消除层析成像中不同散射中心混叠的影响，在构建任意转角下点扩展函数的基础上，研究层析成像的超分辨处理技术，提高图像可读性；深入研究距离单元内存在多目标情况下的窄带雷达成像平动补偿技术，使研究成果进一步贴近实用化。项目研究内容的突破，将为中段目标识别问题提供新的技术途径。

中文关键词： 窄带；中段目标；反演；成像；

英文摘要： As the development of the research in nonideal scatterring characteristics of midcourse targets, we notice that the time-frequency doppler of narrowband scatters does not satisfy with sinusoid hypothesis, which embarrasses the previous narrowband imaging methods. This project aims to further improve the ability of narrowband radar in imaging, character inversion and targets recognition for midcourse targets,and enlarge its superiority in detecting midcourse targets. Firstly, the project aims at representative midcourse targets,such as those winged or rotational symmetry.Based on the full-polarization nonideal scatterring model of warheads, time-frequency doppler analytical model for different kinds of precession scatters is built. We mainly focus on the breakthrough of two kinds of narrowband imaging inversion methods based on time-frequency characteristics of precession and tomography, using mathematical tools such as n-dimension general Radon transform and its inverse transform. Secondly, in order to reduce the aliasing of different scatters in tomographic image, the super resolution of the tomographic theory is researched, which is based on the point spread function in all aspects.Thirdly, the translational compensation method for narrowband imaging in multiple target situation will be futher studied, which i

英文关键词： Narrowband；Mid-course Target；Inversion；Imaging；