基于子波变换阈值决策的非稳信号去噪

本文通过对Donoho阈值决策子波域去噪方法进行研究，该方法采用软限幅函数对噪声信号的子波变换系数做阈值处理以达到去噪的目的。接着具体讨论了在Sym8子波基底下，用此方法对非稳雷达回波进行五尺度的Mallat算法仿真，结果表明该方法抑制噪声效果良好且简单易行，是传统匹配滤波无法比拟的。

Soft-Threshold Filter Algorithm of Non-Stational Signals Based on Wavelet Transform

In this paper a method with wavelet transform based on threshold filter is detailed describled. Thisis, using a soft thresholding to remove noise components from the wavefet coefficients of noisy signal. Then thesimulation of non-sational radar return with five scales by Mallat algorithm under Sym8 wavelet base is dis-cussed. Computer simulations show that this method is valid and useful,, which is not to be compared withmatching -filter.