一种针对多分量信号的复延迟型时频分布的实现方法

摘要

复延迟型时频分布(CTD)是近年来提出的一种新型时频分布.对于单分量调频信号,CTD具有良好的时频聚集性.但是对于包含两个或两个以上分量的多分量调频信号,直接采用定义式或传统频域卷积方法实现的CTD会产生大量的互交叉项,影响了它在各领域的应用.本文对CTD的传统频域卷积实现方法进行了三方面的修正,提出了一种适合多分量调频信号的修正型CTD频域卷积实现方法.仿真结果表明,本文方法对于多分量调频信号,既保持了CTD所固有的时频聚集性高的优点又极大地抑制了不同信号分量间的互交叉项.%A new type of time-frequency distribution with complex-lag argument (CID) is proposed recent years. For mono-component signal, it provides a very high time-frequency concentration. However, for multicomponent signal, CID realized by definition or traditional frequency domain convolution method may gain a lot of cross terms. In this paper, three aspects of modifications have been done to traditional frequency domain convolution method of CID. A new modified frequency domain convolution method of CID suitable for multicomponent signal is proposed. CTD realized by the method which proposed by this paper provides very high time-frequency concentration and the cross-terms are greatly reduced at the same time. This fact is proven by simulation results.