用维纳逆滤波器解卷积提高超声检测纵向分辨率的改进方法

A modified means to Wiener inverse filter for improving vertical resolution of ultrasonic signals

分析了维纳逆滤波传统算法对噪声的适应能力,指出其不稳健及难以适用不同特性检测系统的原因,并据此提出相应的改进方案:根据检测系统冲击响应的频谱范围,分别取不同的域值调整算法,然后进行带内频谱建模及带外频谱拟合估计,从而提高算法对噪声的适应能力.实验结果证明,改进后的方法具有较强的噪声适应能力.

Wiener inverse filter is one of the deconvolution means to renew echo for improving vertical resolution. It is argued that the traditional algorithm is not stable, presents a modified means to improve this problem based on difference test systems, that is use different coefficient for correspondence range, and spectrum extrapolation method. An experiment has proved this modified means is feasible.