几种时频分析方法的对比分析

地震勘探信号属于非平稳信号,进行时频分析时常用到短时傅立叶变换、连续小波变换、Wigner-Ville分布和平滑伪Wigner-Ville分布等时频分析方法,但这些方法存在时频分辨率不够高或交叉项干扰的问题。文章介绍了一种目前在地震勘探领域应用相对较少的方法——谱重排法。在阐明各时频分析方法原理的基础上,对合成地震信号进行试算及对比分析,阐述了各时频分析方法的优缺点。就文章提出的各时频分析方法,提出了谱重排法在地震信号时频分析中的应用优势。

Comparison and Analysis of Several Time-frequency Analysis Methods

The seismic signal is a non-stationary signal, the time-frequency analysis method is often used by short time Fourier transform, continuous wavelet transform, Wigner-Ville distribution smooth pseudo Wigner-Ville distribution and so on. But there are problems that the time-frequency resolution is not high enough or the cross term has interference in using these methods. This paper introduces a method called spectrum reassignment that used relatively less in the field of seismic exploration. On the basis of the analysis of time-frequency theory, this paper analyses and compares the synthetic seismic signal test, expounds the advantages and disadvantages of each time-frequency analysis method. Aimed at the proposed various time-frequency analysis methods, the application advantage of spectrum reassignment in the time-frequency analysis is proposed.