一种抑制时频分布交叉项的新方法  

A New Method for Restrain the Cross-terms of Time-Frequency Distributions

作　　者：王勇[1] 姜义成[1] 

机构地区：[1]哈尔滨工业大学电子工程技术研究所,黑龙江哈尔滨150001

出　　处：《电子学报》2008年第B12期161-165,共5页Acta Electronica Sinica

基　　金：教育部博士点基金(No.20060213009)

摘　　要：提出一种抑制时频分布交叉项的新方法,该方法在Wigner-Ville分布(WVD)的基础上,引入一相位校正函数,可抑制信号的非线性导致的自交叉项影响.对于多分量信号,文中采用洁净(CLEAN)技术对每个信号分量进行带通滤波,抑制了信号分量间的互交叉项影响.该方法在抑制时频分布交叉项的同时,保持着较高的时频聚集性,计算机仿真实验验证了本文算法的有效性.A new method for restrain the cross-terms of time-frequency distributions is presented.By introducing a phase-adjust function（PAF）based on the WVD,this method can restrain the cross-terms induced by the nonlinear character of the signal.And for multi-component signal,the CLEAN technique is adopted to filter out each component by a band-pass filter,and the cross-terms between the components are restrained.At the same time,this method has a high time-frequency convergency,the simulated results demonstrate the validity of it.

关 键 词：交叉项 相位校正函数 洁净技术 时频聚集性 

分 类 号：TN911.72[电子电信—通信与信息系统]