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Denoising GPS-Based Structure Monitoring Data Using Hybrid EMD and Wavelet Packet
Author
Source
Mathematical Problems in Engineering
Issue
Vol. 2017, Issue 2017 (31 Dec. 2017), pp.1-7, 7 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2017-12-18
Country of Publication
Egypt
No. of Pages
7
Main Subjects
Abstract EN
High-frequency components are often discarded for data denoising when applying pure wavelet multiscale or empirical mode decomposition (EMD) based approaches.
Instead, they may raise the problem of energy leakage in vibration signals.
Hybrid EMD and wavelet packet (EMD-WP) is proposed to denoise Global Positioning System- (GPS-) based structure monitoring data.
First, field observables are decomposed into a collection of intrinsic mode functions (IMFs) with different characteristics.
Second, high-frequency IMFs are denoised using the wavelet packet; then the monitoring data are reconstructed using the denoised IMFs together with the remaining low-frequency IMFs.
Our algorithm is demonstrated on a synthetic displacement response of a 3-story frame excited by El Centro earthquake along with a set of Gaussian random white noises on different levels added.
We find that the hybrid method can effectively weaken the multipath effect with low frequency and can potentially extract vibration feature.
However, false modals may still exist by the rest of the noise contained in the high-frequency IMFs and when the frequency of the noise is located in the same band as that of effective vibration.
Finally, real GPS observables are implemented to evaluate the efficiency of EMD-WP method in mitigating low-frequency multipath.
American Psychological Association (APA)
Ke, Lu. 2017. Denoising GPS-Based Structure Monitoring Data Using Hybrid EMD and Wavelet Packet. Mathematical Problems in Engineering،Vol. 2017, no. 2017, pp.1-7.
https://search.emarefa.net/detail/BIM-1190545
Modern Language Association (MLA)
Ke, Lu. Denoising GPS-Based Structure Monitoring Data Using Hybrid EMD and Wavelet Packet. Mathematical Problems in Engineering No. 2017 (2017), pp.1-7.
https://search.emarefa.net/detail/BIM-1190545
American Medical Association (AMA)
Ke, Lu. Denoising GPS-Based Structure Monitoring Data Using Hybrid EMD and Wavelet Packet. Mathematical Problems in Engineering. 2017. Vol. 2017, no. 2017, pp.1-7.
https://search.emarefa.net/detail/BIM-1190545
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1190545