Abstract
The present study provides a suitable GNSS positioning model for long-span bridge deformation monitoring and further improves the GNSS positioning performance using the multipath mitigation technique. An ambiguity-fixed ionosphere-weighted PPP-RTK model is constructed to provide real-time high-accuracy positioning service for long-span bridge deformation monitoring. In addition, a multipath model is established for GPS and BDS (GEO/IGSO/MEO) in the space domain for multipath mitigation. Elevation and azimuth of each satellite is recorded to compute multipath correction when the satellite appears in the same location. The results show that PPP-RTK can be well used for long-span bridge deformation monitoring. The multi-constellation multipath model can significantly improve performance. With the multipath mitigation method, PPP-RTK has obviously gained in the convergence time to reliably fix the ambiguities, as well as in the positioning accuracy and normal distribution characteristics of the observation residuals. We show bridge deformation monitoring results of the Hong Kong–Zhuhai–Macao Bridge for five consecutive days, where the PPP-RTK performance with multipath mitigation shows high positioning accuracy with fast convergence time. Moreover, our model is capable of identifying the high-frequency vibration and low-frequency displacement of the bridge. The natural frequency of 0.373 Hz in the vertical direction of the bridge under the typhoon Chaba excitation has been detected.
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The observation data of this study are available from the authors for academic purposes on reasonable request.
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Acknowledgements
This work was funded by the National Natural Science Foundation of China (Grant No. 42022025). This work was supported by National Key R&D Program of China (Grant No. 2019YFB1600700). This work was supported in part by the Research Grants Council of the Hong Kong Special Administrative Region, China under Project PolyU/RGC 15221620/B-Q80Q.
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Rui Gao processed the data, analyzed the results and wrote the main manuscript text. Zhizhao Liu designed the research and revised the manuscript. Robert Odolinski revised the manuscript. Qiang Jing, Jiantong Zhang and Hua Zhang conducted the experiment and collected the data. Baocheng Zhang initialized the idea, proposed the method and revised the manuscript. All authors reviewed the manuscript.
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Gao, R., Liu, Z., Odolinski, R. et al. Hong Kong–Zhuhai–Macao Bridge deformation monitoring using PPP-RTK with multipath correction method. GPS Solut 27, 195 (2023). https://doi.org/10.1007/s10291-023-01491-9
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DOI: https://doi.org/10.1007/s10291-023-01491-9