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本文提出一种采用频域紧支集正交小波基的非线性柔性阈值滤波方法，该方法利用频域紧支集小波基的良好频谱特性和信号压缩能力，有效地消除了高斯白噪声对瞬态散射回波的干扰．文中以一人工合成瞬态回波，实测球体瞬态晚期响应和1：72的B-58飞机模型的散射回波为例，对本文方法的有效性作了检验，并将其与傅立叶滤波、样条拟合消噪小波变换极大模算法及采用Daubechies基的非线性柔性阈值滤波法作了比较，显示了本文方法的优越性．
In this paper, a nonlinear flexible threshold filtering method using orthogonal wavelet bases in frequency domain is proposed. This method utilizes the good spectral characteristics and signal compression ability of the frequency-domain compactly supported wavelet base to effectively eliminate the effects of Gaussian white noise on the instantaneous State scattered echo interference. In this paper, a synthetic transient echo, the measured transient response of the sphere and the scattering echo of the 1:72 B-58 aircraft model are taken as an example to test the effectiveness of the proposed method and compare it with the Fourier filtering, The spline fitting denoising wavelet transform max-module algorithm and the Daubechies-based nonlinear flexible threshold filtering method are compared to show the superiority of the proposed method.