基于时频重排和时频脊线的信号脉内特征提取  

Extracting In-Pulse Characteristics Based on Time-Frequency Reassignment and Time-Frequency Ridge

作　　者：陈昌孝[1] 何明浩[2] 朱元清[3] 王志斌[1] 

机构地区：[1]空军雷达学院研究生管理大队,武汉430019 [2]空军雷达学院训练部,武汉430019 [3]空军雷达学院电子对抗系,武汉430019

出　　处：《数据采集与处理》2008年第1期95-99,共5页Journal of Data Acquisition and Processing

基　　金：国防预研基金(J1442050204JB4901)资助项目

摘　　要：针对小波脊线法在提取雷达信号脉内特征时信噪比性能较差的缺点,本文基于小波变换谱,将时频重排和时频脊线相结合,提出了一种新的时频联合分析方法。该方法借助于时频重排在改善谱图时频凝聚性方面的优势,使算法的信噪比性能得到有效改善。仿真表明,在低信噪比条件下,该方法仍可得到准确的估计值。Aiming at the poor SNR performance of wavelet-ridge in extracting in-pulse features, an novel unite method for-frequency analysis is proposed. Based on the wavelet spectrum, the time-frequency reassignment is combined with the time-frequency ridge. With time- frequency reassignment for improving the time-frequency agglomeration of the spectrum, the SNR performance of wavelet-ridge is enhanced. Simulation results approve the feasibility of the method.

关 键 词：脉内特征 时频重排 小波谱 脊线 

分 类 号：TP971.1[自动化与计算机技术]