Research on Wavelet Threshold Denoising Method for UWB Tunnel Personnel Motion Location

In the process of tunnel construction, the problems of strong sealing, inconvenient communication, and harsh environment pose a serious threat to the personal safety of construction workers. Therefore, personnel positioning technology has important application value in tunnel safety construction. A...

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Bibliographic Details
Published in:Mathematical problems in engineering 2020, Vol.2020 (2020), p.1-14
Main Authors: Fu, Guodong, Su, Zhong, Zhang, Ranqiao, Liu, Ning, He, Jingang
Format: Article
Language:English
Subjects:
Accuracy
Algorithms
Communication
Construction
Construction industry
Decomposition
Engineering
Localization
Noise
Noise reduction
Outliers (statistics)
Personnel
Propagation
Radio frequency identification
Safety
Tunnel construction
Ultrawideband
Wavelet analysis
Wavelet transforms
Wireless networks
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Summary:In the process of tunnel construction, the problems of strong sealing, inconvenient communication, and harsh environment pose a serious threat to the personal safety of construction workers. Therefore, personnel positioning technology has important application value in tunnel safety construction. A special environment for tunnel personnel positioning and the ultrawideband (UWB) positioning system are affected by personnel movement, which leads to the problem of lowering positioning accuracy. A wavelet threshold denoising method for motion positioning of people in tunnels is proposed. The positioning algorithm of the method adopts a three-sided positioning algorithm based on symmetric double-sided two-way ranging. The wavelet analysis is used to decompose the motion signal of the personnel in the tunnel, and the low frequency coefficient and high frequency coefficient of the signal are decomposed to determine the influence of the motion noise of the personnel on the UWB positioning. The soft threshold function and the hard threshold function are, respectively, selected to perform wavelet threshold denoising on the motion positioning result in the tunnel. According to the denoising effect, the db5 wavelet 5-layer decomposition, under the heuristic threshold estimation criterion, the soft threshold function denoising is the best denoising method. The verification by the positioning experiment shows that the method is suitable for tunnel personnel positioning. The wavelet threshold denoising method can weaken the influence of outliers in the motion positioning of UWB personnel and improve the positioning accuracy.
ISSN:1024-123X
1563-5147
DOI:10.1155/2020/9039648