时频分析技术在地震信号初至估计中的应用

Application on technique of joint time-frequency analysis of seismic signal's first arrival estimation

时频分析旨在构造一种时间和频率的联合密度函数,继而揭示信号所含频率分量及其演化特性,是传统Fourier分析的新进展、乃至于革命。本文通过对地震信号噪声特性的分析,研究了基于联合时频谱图三重相关的地震信号初至的估计方法,并给出了实验结果和结论。

Joint time-frequency analysis is conducted to construct one joint density function of time and fre- quency. It can open out one signal＇s frequency components and their evolvements. It is the new evolvement of Fourier analysis. In this paper, according to the characteristic of seismic signal＇s noise, one estimarion method of seismic signal＇s first arrival based on triple correlation of joint time-frequency spectrum is introduced, and the results of experiment and conclusion are presented.