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The use of PSD analysis on BeiDou and GPS 10 Hz dynamic data for change detection

Roberts, Gethin Wyn; Tang, Xu

Authors

Gethin Wyn Roberts

Xu Tang



Abstract

This paper examines the use of GPS and BeiDou data to measure the movements of two oscillating platforms in a series of field experiments. Data were gathered from a variety of GNSS receivers at a rate of 10Hz, and processed in an on the fly manner, resulting in 3D coordinates at a 10Hz rate with the corresponding precise time. These data were then analysed using a Power Spectral Density (PSD) function to derive the frequency of the movements. The positional data were also compared by matching a 500 epoch section of the data from the start with 190 successive 500 epoch long sections in order to demonstrate whether the movement measured was constant throughout, or whether there were any changes. The results show that the correlation of the positional data over a 30,737 epoch period deviates between 99.8% to 76.7% correlation with RMS values of 89.2%, 87.9% and 77.5% in the Eastings, Northings and Vertical directions respectively when using GPS. The RMS of the Eastings and Northings remain the same when BeiDou is introduced, but the height component improves slightly to 78.9%. The frequency analysis of the same 500 epoch long sections is constantly measured at 0.1172Hz in all three positional components, illustrating less deviation when analysing the frequencies. The main conclusion is that analysis of the resulting PSD output from GNSS data gathered on an oscillating platform is more constant and precise than analysing the results of the coordinates alone. This suggests that such analysis would be well suited for a Structural Health Monitoring system. The introduction of BeiDou also improves the results slightly, even in its current incomplete constellation. The novelty of this work is the analysis of the movements in such a controlled environment, and the correlation approach of the resulting positional output as well as the frequency derivation from the positions using both GPS and BeiDou.

Citation

Roberts, G. W., & Tang, X. (2017). The use of PSD analysis on BeiDou and GPS 10 Hz dynamic data for change detection. Advances in Space Research, 59(11), 2794-2808. https://doi.org/10.1016/j.asr.2016.10.020

Journal Article Type Article
Acceptance Date Oct 21, 2016
Online Publication Date Oct 27, 2016
Publication Date Jun 1, 2017
Deposit Date Nov 2, 2016
Publicly Available Date Mar 28, 2024
Journal Advances in Space Research
Print ISSN 0273-1177
Electronic ISSN 1879-1948
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 59
Issue 11
Pages 2794-2808
DOI https://doi.org/10.1016/j.asr.2016.10.020
Public URL https://nottingham-repository.worktribe.com/output/821369
Publisher URL http://www.sciencedirect.com/science/article/pii/S0273117716305981

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