CAJ | 학술논문

谱图(spectrogram,SP)和维纳-威利分布(Wigner-Ville distribu-tion,WVD)组合时频分布是针对多分量信号的一种新型时频分布算法,为减少谱图交叉项带来的误差,从多角度分析了谱图分布及 WVD的交叉项产生原理,提出了一种改进的组合时频分析方法。该方法首先对具有不同窗长和不同窗函数的多个谱图进行叠加综合；然后通过对时频分布综合结果进行阈值化处理获得自项支撑区域,最终实现了对 WVD交叉项的抑制。仿真结果表明,该方法保持了 WVD 良好的时频聚集性,并有效抑制了交叉项。
보도(spectrogram,SP)화유납-위리분포(Wigner-Ville distribu-tion,WVD)조합시빈분포시침대다분량신호적일충신형시빈분포산법,위감소보도교차항대래적오차,종다각도분석료보도분포급 WVD적교차항산생원리,제출료일충개진적조합시빈분석방법。해방법수선대구유불동창장화불동창함수적다개보도진행첩가종합；연후통과대시빈분포종합결과진행역치화처리획득자항지탱구역,최종실현료대 WVD교차항적억제。방진결과표명,해방법보지료 WVD 량호적시빈취집성,병유효억제료교차항。
Spectrogram (SP)& Wigner-Ville distribution (WVD)combination distribution is a new time-frequency distribution algorithm for multi-component signal.In order to reduce the error caused by the spectrograms cross-terms,by analyzing the mechanism of the cross-terms in SP &WVD from multiple perspectives,an improved algorithm is presented about time-frequency distribu-tion.First,spectrograms distribution of multiple window length and window type is superimposed. Secondly,the auto-term support region is obtained by thresholding the result of complex time-frequency.And at last,the cross-terms are restrained by the auto-term support regions.The experi-mental results show that the new method can maintain the good time-frequency aggregation and inhibit the cross-terms of WVD.