采用最优频率匹配法处理信号

来源期刊：中南大学学报(自然科学版)2003年第2期

论文作者：吕苗荣 古德生

文章页码：196 - 199

关键词：最优频率匹配法;搜索;信号处理;井间地震层析成像;去噪

Key words：optimum match frequency method; search; signal processing; crosshole seismic tomography; noise reduction

摘    要：通过比较目前进行声波CT信号信噪分离所使用的许多方法及特点,指出了快速傅里叶变换(FFT)的局限性,研究了周期性问题的数值计算特点;采用最优化理论分析了信号本身各种频率成分优化搜索与计算的可能性,在此基础上提出最优匹配频率的概念和计算方法,研究了最优频率匹配法计算结果的规律性,并将该方法应用于某矿区声波CT信号特征参数的提取和信噪分离.

Abstract: It is very important and difficult to obtain the genuine periods in different signal components and to find the periodic law in nature. After comparing with different methods used to reduce noises in crosshole seismic tomography, this paper points out the limits in use of Fourier transformation or FFT, studies the numerical computation’s characteristics in periodic problem, and adopt optimization theory to realize the search of signal′s genuine frequencies, amplitudes and phrases. On the basis of above study, Optimum Matching Frequency Method(OMFM) is put forward, and rules by use of OMFM to processing signals are investigated. This method is successfully used to obtain sonic wave parameters and to separate noises from signal.