小波变换降噪技术及其在Matlab中的实现

Noise Reduction Technology Based on Wavelet Transform and Realization in Matlab

小波降噪含模极大值、尺度空间滤波、域值滤波三种方法。域值滤波法只对低频部分进一步分解,不考虑高频部分,因而用小波函数进行处理。域值滤波方法的处理过程为:对信号进行小波分解;小波分解高频系数的域值量化;信号重组。对潜艇获得的测量方位信号仿真结果分析表明,该方法可行。

Modular maximum, scale space filtering and domain value filtering are three methods of wavelet noise reduction. Domain value filtering method only decompounded the low frequency, without considering the high frequency, so it can be disposed through wavelet function. The disposing process of domain value filtering method as follows： the wavelet decomposition of signals; the domain value quantification of high frequency coefficient in wavelet decomposition; recombination of signals. The simulation result of the submarine measure orientation proves that this method is reliable.