超声回波信号的小波消噪研究

利用小波变换的时频局部化性质,对超声回波弱信号特征进行提取,得到了较好的边缘信号,从而对信号进行全面细致的分析。理论分析和仿真结果表明,小波分析方法适合于超声回波信号的检测和特征提取,在改善了信噪比的同时,还保持了很高的时间（空间）分辨力,具有准确度高、抗噪声性能好等优点。并将该技术应用于物距测量中,提高了系统测量的准确度。

Study on Wavelet Transform Denoising in Ultrasonic Echo Signal

Ultrasonic echo signal characteristic is extracted by using part characteristic of wavelet transform time-frequent, so as to get a better echo signal and particularity signal is completely analyzed. Theoretical analyses and simulation results demonstrate that the wavelet transform method can be applied to measure end of ultrasonic echo signal and characteristic extraction, and SNR is improved, higher time （space） resolution is remained also. The method has the advantage of high precision, better disturbance resistance. The method is used to distance measurement to improve the accuracy of measurement system.