宽带信号及其特征的微多普勒提取技术研究  

Research on extraction technology of micro-Doppler of wideband signal and its properties

作　　者：孙照强[1] 鲁耀兵[1] 李宝柱[1] 彭军[1,2] 

机构地区：[1]中国航天科工集团公司二院二十三所,北京100854 [2]空军工程大学导弹学院,陕西三原713800

出　　处：《系统工程与电子技术》2008年第11期2040-2044,共5页Systems Engineering and Electronics

摘　　要：雷达目标的微多普勒特性正成为目标识别领域的一个研究热点,而宽带信号能够提供目标更多的精细结构信息和微动信息,因此宽带信号下微多普勒及其特征提取技术对目标识别来说是至关重要的。从宽带线性调频(LFM)信号成像理论出发,推导出了宽带LFM信号微多普勒提取方法。首次提出了用时域自相关法和频域倒谱法来提取微多普勒变化周期,并用傅里叶变换法提取微多普勒的最大值。仿真结果证明了上述方法的正确性和有效性。The characteristic of micro-Doppler of radar targets is becoming a research hotspot, while wideband signals can provide more refined structure and micro-motion information. So the extraction technology of micro-Doppler for the wideband signal and its properties is especially important for recognization. Based on the theory of ISAR imaging of wideband LFM signals, the extraction method of micro-Doppler from wideband LFM signal is derived. The methods that autocorrelation function in time domain and cepstrum in frequency domain are utilized to extract the period of micro-Doppler variation are proposed for the first time. The maximum of micro-Doppler is extracted by means of FFT. Computer simulation results prove the methods mentioned above are correct and effective.

关 键 词：目标识别 微多普勒 线性调频 自相关法 倒谱法 

分 类 号：TN957.51[电子电信—信号与信息处理]