强杂波下含旋转部件的目标成像及微多普勒提取  

Imaging and micro-Doppler extraction of targets with rotating parts in strong ground clutter

作　　者：罗迎[1] 张群[1,2] 封同安[1] 金亚秋[2] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077 [2]复旦大学波散射与遥感信息教育部重点实验室,上海200433

出　　处：《系统工程与电子技术》2009年第2期261-264,共4页Systems Engineering and Electronics

基　　金：国家自然科学基金(60672032);陕西省自然科学基础研究计划项目(2007F28)资助课题

摘　　要：目标结构中的旋转部件引起的雷达回波信号的附加频率调制称为微多普勒现象,其反映了目标独一无二的结构特征,同时也给目标主体的成像带来了污染。提出了一种强地杂波背景下含旋转部件目标成像及微多普勒信号提取的方法。在对目标回波解线调时,采用一次相消技术剔除地杂波,获得清晰的目标谱图;再对谱图进行处理,分离目标主体信息和微多普勒信息,实现目标主体的清晰成像;对微多普勒信息进行分析还可以获取目标的一些微动特征。最后的仿真实验验证了该方法的有效性。Mechanical vibration or rotation of structures on a target may induce additional frequency modu- lations on the returned radar signal, which is called the micro-Doppler effect. Micro-Doppler can be regarded as a unique signature of the target and also brings contamination into the inverse synthetic aperture radar （ISAR） image. A method for imaging and micro-Doppler extraction of targets with rotating parts in strong ground clut- ter is presented. The one-order canceller method is utilized to filter out the ground clutter in the signal stretc- hing process, and then a clear spectrogram of targets is obtained. Dealing with the spectrogram the micro- Doppler information can be gained as well as a clearer ISAR image. A computer simulation is given to prove the effectiveness of the proposed method.

关 键 词：雷达成像 微多普勒 一次相消 地杂波 

分 类 号：TN957[电子电信—信号与信息处理]