SHANDONG SCIENCE ›› 2017, Vol. 30 ›› Issue (6): 71-78.doi: 10.3976/j.issn.1002-4026.2017.06.012

• Optical Fiber and Photonic sensingtechnology • Previous Articles     Next Articles

Research on wavelet packet global threshold de-noising for laser Doppler velocimetry signal

ZHANG Da1 ,LIU Rang-lei2 ,YAO Jing2   

  1. 1.College of Automation and Electrical Engineering, Qingdao University of Science and Technology, Qingdao 266061, China;
    2.College of Electromechanical Engineering, Qingdao University of Science and Technology,Qingdao 266061, China
  • Received:2017-05-25 Published:2017-12-20 Online:2017-12-20

Abstract:

The actual laser Doppler velocimetry signal mixed up much noise, so it was difficult to find the required Doppler frequency shift. In this paper, a wavelet packet global threshold denoising method was proposed to solve this problem, which was also used to process Doppler velocimetry signal in MATLAB. According to the characteristics of the Doppler signal, through the selection of wavelet packet decomposition scale, the comparison of threshold estimation methods and the adjustment of threshold thr, the developed method could quickly and effectively eliminate the noise signal, improve the SNR and obtain useful signals.

Key words: global threshold de-noising, SNR, Doppler frequency shift, decomposition scale

CLC Number: 

  • TN247

Open Access This article is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0), which permits third parties to freely share (i.e., copy and redistribute the material in any medium or format) and adapt (i.e., remix, transform, or build upon the material) the articles published in this journal, provided that appropriate credit is given, a link to the license is provided, and any changes made are indicated. The material may not be used for commercial purposes. For details of the CC BY-NC 4.0 license, please visit: https://creativecommons.org/licenses/by-nc/4.0