摘要
本文利用小波变换的方法，分析了地震信号的时一频特征，由时一频特征曲线可以看出，随着时间（深度）的增加，地震信号高频分量相对于低频分量之比越来越小。在此基础上给出了地震信号瞬时动态范围的定义和物理解释，进而指出，在地震信号采集仪器中，为了获得深层的高频信号，必须采用动态范围高达24位的新型过采样∑—△A／D转换器。
This paper analyzes the time-frequency characteristic of seismic signals by use of the wavelet transform method. From the time-frequency characteristic curves it can be seen that the ratio of high components to low frequency components in seismic signal comes less with time (depth ) inereasing. Based on the anlysis,we definc the instantaneous dynamic range of seismic signals and give its physical explanation. It points out that in order to obtain high frequency signal from deep layers, the new type of oversampling A/D converters with up to 24-bit dynamic range must be used.
出处
《石油物探》
EI
CSCD
北大核心
1996年第1期56-70,共15页
Geophysical Prospecting For Petroleum
关键词
地震信号
瞬时动态范围
时一频特性
数据处理
Seismic Signal, Instantaneous Dynamic Range, Time-Frequency Characteristic,Wavelet Transform
