小波包去噪方法在海底石油管道超声检测中的应用

通过分析海底石油管道超声检测回波信号，部分有效信号混在噪声信号里，本文研究了具有任意多尺度分解特性的小波包去噪方法。首先介绍了小波包的基本理论以及去噪声理论，然后运用小波包分析对实际测量的超声回波信号进行。处理。仿真结果表明，小波包去噪法能更好地抑制噪声，明显提高信噪比。

Application of Wavelet Packet De-Noising Method in Seabed Oil Pipeline Ultrasonic Detecting

By analyzing echo signal for seabed oil pipeline ultrasonic detection, the part of effective signals mixed into noise signals, the authors developed a kind of de-noising method based on wavelet packet that is characterized with the random multi-resolution. The basic principle of wavelet packet and de-noising theory are first introduced, and then the measured ultrasonic echo signal is processed by using wavelet packet analysis. The simulation result shows that the wavelet packet de-noising method can preferably suppress the noise and the signal-to-noise ration is obviously improved.