基于Wigner-Ville分布的复杂时变信号的时频分析  

Time-Frequency Analysis for Complex Time-Varying Signals Based on Wigner-Ville Distribution

作　　者：王忠仁 林君[1] 李文伟 

机构地区：[1]地球信息探测仪器教育部重点实验室 [2]中国兵器工业系统总体部,北京100089

出　　处：《电子学报》2005年第12期2239-2241,共3页Acta Electronica Sinica

基　　金：国家高技术研究发展计划(863计划)课题(No.2002AA135240)

摘　　要：对多分量线性调频(LFM)信号、单分量非线性调频(NLFM)信号以及多分量NLFM信号的Wigner-Ville分布进行了数值计算,探讨了信号项与交叉项之间的差异性特征,提出了信号时频曲线中点集的概念,研究了交叉项出现的一般规律.对于多分量信号,交叉项出现在信号项时频曲线之间的中点集之内.对于单分量NLFM信号,也有交叉项产生,交叉项出现在信号项时频曲线自身的自中点集之内.Wigner-Ville distributions are implemented for a multicomponent linear frequency modulation （LFM） signal, a single component nonlinear frequency modulation （LFM） signal, and a muhicomponent NLFM signal. Different characteristics between signal items and crossed items are discussed. A concept of midpoint set of time-frequency curves is presented. A general law for crossed item appearing is studied. In time-frequency plane, the images of signal items are smooth continuous curves, but the images of crossed items are pinto interference patterns.For a multicomponent signal, crossed items appear in midpoint set of the signal time-frequency curves. A single component NLFM signal can also produce crossed item, and it appears in self-midpoint set of the signal time-frequency curve itself.

关 键 词：WIGNER-VILLE分布 时变信号 时间-频率分析 交叉项 时频曲线中点集 

分 类 号：TN911.7[电子电信—通信与信息系统]