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

作　　者：许朝阳[1] 季国华[2] 刘俊民[1] 范延芳[1] 

机构地区：[1]禁核试北京国家数据中心,北京100085 [2]西北核技术研究所,陕西西安710024

出　　处：《核电子学与探测技术》2008年第5期987-990,共4页Nuclear Electronics & Detection Technology

摘　　要：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.

关 键 词：时频分析 三重相关 时频谱图 初至估计 

分 类 号：P315.63[天文地球—地震学] TN911.6[天文地球—固体地球物理学]