Laser Doppler Signal Denoising Based on Wavelet Packet Thresholding Method
Joint Authors
Source
International Journal of Optics
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-11-14
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
In laser Doppler velocimeter (LDV), calculation precision of Doppler shift is affected by noise contained in Doppler signal.
In order to restrain the noise interference and improve the precision of signal processing, wavelet packet threshold denoising methods are proposed.
Based on the analysis of Doppler signal, appropriate threshold function and decomposition layer number are selected.
Heursure, sqtwolog, rigrsure, and minimaxi rules are adopted to get the thresholds.
Processing results indicate that signal-to-noise ratio (SNR) and root mean square error (RMSE) of simulated signals with original SNR of 0 dB, 5 dB, and 10 dB in both low- and high-frequency ranges are significantly improved by wavelet packet threshold denoising.
A double-beam and double-scattering LDV system is built in our laboratory.
For measured signals obtained from the experimental system, the minimum relative error of denoised signal is only 0.079% (using minimaxi rule).
The denoised waveforms of simulated and experimental signals are much more smooth and clear than that of original signals.
Generally speaking, denoising effects of minimaxi and saqtwolog rules are better than those of heursure and rigrsure rules.
As shown in the processing and analysis of simulated and experimental signals, denoising methods based on wavelet packet threshold have ability to depress the noise in laser Doppler signal and improve the precision of signal processing.
Owing to its effectiveness and practicability, wavelet packet threshold denoising is a practical method for LDV signal processing.
American Psychological Association (APA)
Zhang, Da& Liu, Ranglei. 2019. Laser Doppler Signal Denoising Based on Wavelet Packet Thresholding Method. International Journal of Optics،Vol. 2019, no. 2019, pp.1-11.
https://search.emarefa.net/detail/BIM-1166547
Modern Language Association (MLA)
Zhang, Da& Liu, Ranglei. Laser Doppler Signal Denoising Based on Wavelet Packet Thresholding Method. International Journal of Optics No. 2019 (2019), pp.1-11.
https://search.emarefa.net/detail/BIM-1166547
American Medical Association (AMA)
Zhang, Da& Liu, Ranglei. Laser Doppler Signal Denoising Based on Wavelet Packet Thresholding Method. International Journal of Optics. 2019. Vol. 2019, no. 2019, pp.1-11.
https://search.emarefa.net/detail/BIM-1166547
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1166547