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.
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.
出处
《中南工业大学学报》
CSCD
北大核心
2003年第2期196-199,共4页
Journal of Central South University of Technology(Natural Science)
