CAJ | 학술논문

在存在工频干扰的地区开展瞬变电磁法(TEM)工作时,工频干扰的强度通常很大,它的存在会使得反映地电异常的有用信号受到严重畸变,压制或去除工频干扰是数据预处理工作中的一项基础工作.针对这一问题,笔者设计了一种由可编程滤波器和自适应算法组成的具有自动调整滤波参数的滤波器.在进行滤波运算时,采用最小均方误差(LMS)算法不断地对滤波因子进行自动调节,使它们适应输入信号的相关特性,从而获得良好的滤波效果.理论数值模型和实际野外数据的验算表明,文中所设计的自适应滤波器具有很好的工频滤波效果.
재존재공빈간우적지구개전순변전자법(TEM)공작시,공빈간우적강도통상흔대,타적존재회사득반영지전이상적유용신호수도엄중기변,압제혹거제공빈간우시수거예처리공작중적일항기출공작.침대저일문제,필자설계료일충유가편정려파기화자괄응산법조성적구유자동조정려파삼수적려파기.재진행려파운산시,채용최소균방오차(LMS)산법불단지대려파인자진행자동조절,사타문괄응수입신호적상관특성,종이획득량호적려파효과.이론수치모형화실제야외수거적험산표명,문중소설계적자괄응려파기구유흔호적공빈려파효과.
This project uses the least-mean-square algorithm for reducing the industrial-frequency noise of the transient electromagnetic signal that has been corrupted with noise. The problem is done for the TEM exploration method where the acquired signal is being corrupted by the noise of the industrial electricity, which is from either the electric wire in the air or the underground. In the following first a brief introduction of digital signal processing is given followed by a short summary of adaptive filters. Then we design an adaptive filter that is based on least-mean-square algorithm to reduce industrial-frequency interference. Both experiments of theoretical modeling and results of practical application show the designed algorithm of the adaptive filter is available and efficient. Finally I conclude by saying what I think about the work I have done.