摘要
时 -频分析是信号分析中非常有力的工具 ,近年来在处理非稳态信号方面获得了很大的成功。本文将联合时 -频分析 (JTFA)用于处理地球物理勘探中具有扩散性质的瞬变电磁场信号。首先用数字滤波和逆拉氏算法模拟了分层大地表面上中心回线装置的瞬变响应 ,然后用Gabor展开研究它们的时 -频谱 ,结果将地层序列成功地区分开来 。
Time-frequency analysis is a powerful tool of signal processing,which has been used successfully in non-stationary signals recently.This paper uses joint time-frequency analysis (JTFA) for processing transient electromagnetic (TEM) field signals that have diffuse feature in geophysical exploration.First, the transient electromagnetic response on the layered earth excited by a step pulse is simulated using digital filtering and Gaver-Stehfest; and then their time-frequency characteristics are investigated with Gabor expansion.The sequences of the earth are distinguished successfully,which provides a new interpreting method for TEM prospecting.
出处
《煤田地质与勘探》
CAS
CSCD
北大核心
2004年第1期48-51,共4页
Coal Geology & Exploration
基金
国家自然科学基金项目资助 (No.4 9974 0 2 6 )
