基于LMS自适应噪声对消法的激光液位测量信号波动抑制研究  

The Elimination of Laser Liquid-Level Measurement Signal Fluctuation Based on the LMS Adaptive Noise Cancellation

作　　者：宋念龙[1] 刘欢[1] 侯晓宁[1] 李琦[1] 张新雨[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《西安理工大学学报》2012年第1期90-93,共4页Journal of Xi'an University of Technology

基　　金：国家科技重大专项基金资助项目(2009ZX02011001)

摘　　要：针对激光液位检测中的信号波动问题,提出了一种采用LMS自适应噪声对消法抑制噪声的信号滤波方法,该方法采用数字高通滤波器获取自适应噪声对消器参考通道的信号。论述了自适应滤波器噪声对消的工作原理、LMS算法以及Butterworth数字高通IIR滤波器的设计方法,给出了整个噪声对消系统的原理图。仿真和实验结果表明,该噪声对消法在保证实际测量信号相位不变的情况下对液位测量信号的波动影响具有明显的消除和抑制作用。In order to solve the problem of signal fluctuation in the laser liquid-level measurement,this paper introduces a method of signal filtering,which uses LMS adaptive noise cancelling to eliminate noise.This paper deals with the working principle of adaptive noise cancelling,LMS algorithm and Butterworth digital high-pass IIR filter,and also suggests the theoretical scheme of adaptive noise cancelling system.The results of simulation and experiment indicate that,this noise cancelling method is of apparently significant elimination and inhibition effects upon the liquid-level measurement signal fluctuations in the case of ensuring no changes in actual measurement signals.

关 键 词：液位检测 自适应噪声对消 巴特沃斯滤波器 最小均方算法 

分 类 号：TP14[自动化与计算机技术—控制理论与控制工程] TP274.2[自动化与计算机技术—控制科学与工程]