基于相干Doppler干涉的微动目标宽带成像方法  

Wideband imaging method for micro-motion target based on coherent Doppler interferometry

作　　者：霍凯[1] 姜卫东[1] 黎湘[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,湖南长沙410073

出　　处：《系统工程与电子技术》2014年第2期239-247,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(61025006;61072117);国家重点实验室开放课题基金(CEMEE2014K0207B)资助课题

摘　　要：二维像是雷达目标最重要的特征之一,它反映了目标的几何形状、散射结构等特性。在目标存在微动的情况下,即使目标散射中心不发生越距离单元走动,微动带来宽带回波的非线性相位也会导致方位向的散焦。针对这一问题,提出了基于相干多普勒干涉的微动目标宽带雷达成像算法,其核心思想是在对强散射中心所在的距离单元进行相干多普勒干涉成像的基础上,再进行目标二维像重构。仿真实验验证了所提算法的有效性。The 2-dimensional radar image of the target reflects geometrical shape of the target, scattering structure, and so on, which is one of the most important characters of the target. Although there is no migra- tion through resolution cells in the high resolution range profile, targets with micro-motion can cause nonlinear phase for the echo of wideband radar, which makes the 2-dimensional radar image smeared when the fast Fouri- or transform is used to realize pulse compression in azimuth. To solve this problem, a wideband imaging method for micro-motion target based on coherent Doppler interferometry is proposed. The main idea is to obtain the image of the strong scattering points in the same range cell, by using coherent Doppler interferometry, respec- tively at first. And then, the 2-dimensional image of the target is reconstructed. Computer simulations demon- strate the validity of the proposed algorithm.

关 键 词：宽带成像 相干多普勒干涉 微动 时频分析 

分 类 号：TN958[电子电信—信号与信息处理]