基于自适应和小波模极大值重构的地面核磁共振信号噪声压制方法

被引：8

作者：

孙淑琴

孟庆云

方秀成

林君

王应吉

田宝凤

杨楠

机构：

[1] 吉林大学仪器科学与电气工程学院

来源：

吉林大学学报(工学版) | 2015年 / 45卷 / 05期

关键词：

通信技术; 核磁共振; 干扰滤除; 自适应滤波; 小波模极大值重构滤波;

D O I：

10.13229/j.cnki.jdxbgxb201505038

中图分类号：

P641.7 [地下水普查与勘探]; TN911.4 [噪声与干扰];

学科分类号：

0818 ; 081802 ;

摘要：

针对核磁共振信号中的噪声,在二进小波变换基本原理的基础上,研究了小波模极大值重构方法,将该方法与自适应滤波方法相结合应用到含噪声信号的干扰滤除中,通过分析包络信号拟合后的初始振幅、平均衰减时间和相位等数据可知,含噪声信号经自适应和小波模极大值重构方法滤波处理后拟合得到的特征参数误差最小且信噪比得到最大的提高。同时,通过实测数据得知采用自适应和小波模极大值重构方法进行噪声滤波后的结果与钻孔结果的一致性较好,验证了本文所提方法的有效性。

引用

页码：1642 / 1651

页数：10

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