雷达目标旋转部件的微Doppler效应  

Micro-Doppler Effect of Rotation Structure on Radar Targets

作　　者：李金梁[1] 王雪松[1] 刘阳[1] 刘进[1] 孟刚 王涛[1] 

机构地区：[1]国防科学技术大学电子科学与工程学院,长沙410073 [2]试验物理与计算数字实验室,北京100076

出　　处：《电子与信息学报》2009年第3期583-587,共5页Journal of Electronics & Information Technology

基　　金：国家973计划安全重大基础研究(6136002);国家自然科学基金(60672033)资助课题

摘　　要：目标的微动特征与目标属性密切相关,可作为目标识别的重要特征。对旋转部件,该文建立了具有空域时变特性的点散射模型。基于此模型,分析了由目标的旋转部件引起的微Doppler效应,对含有旋转部件的目标回波的时频特性进行了理论推导,并利用外场实测数据,得到了雷达目标回波的时频图,与理论推导的结果十分吻合,验证了理论推导的正确性。在此基础上,提出了一种基于短时傅里叶变换的目标微动参数提取方法,利用实测数据对目标的微运动参数提取进行了尝试,得到了很好的结果,为PD雷达的目标特征提取与识别提供了理论指导。Micro-dynamics characteristics are related to target＇s structures and can be used for target classification. Rotation structure of target is modeled as a sum of directional point scatterers. With the directional point scatter model, the micro-Doppler effect induced by rotation structure is analyzed. Then the joint time-frequency characteristics of radar echoes from targets which include rotation structure are investigated, and verified by real radar data. Finally, an extraction method of micro-motion characteristics, such as rotation frequency, is presented, and it is attempted to extract micro-dynamics characteristics, and the results are satisfactory.

关 键 词：雷达目标识别 微运动 微多普勒 旋转部件 时频特性 

分 类 号：TN95[电子电信—信号与信息处理]