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• W4283735264 abstract "Extensive data collection, unified and rigorous data processing, and accurate construction of station motion model (especially the correction of co-seismic/post-seismic effects of large earthquakes) are three basic elements for the accuracy and reliability of Global Navigation Satellite System (GNSS) velocity. Thus, we take advantage of the sensitivity features of the spectral analysis and hypothesis test to refine the site movement trajectory model, and apply it to the reprocessed GNSS three-decade coordinate time series. Firstly, we reprocess GNSS observations and seismic records based on the updated convention and processing settings of International GNSS Service (IGS) repro3. Secondly, we use the Improved Lomb–Scargle Periodogram (ILSP) model to analyze the periodic characteristics of GNSS vertical time series. The results represent that the primary period of about 35% of sites is 365 days, and the secondary period of 20% of sites is 182 days. Thirdly, we evaluate the performance of different time series model component combination of the time series (a: velocity only; b: velocity + offset; c: velocity + offset + PSD; d: velocity + offset + PSD + period) and Post-Seismic Deformation (PSD) modes (PSD1: None; PSD 2: Exp; PSD 3: Log; PSD 4: Exp + Log). Fourthly, we use the chi-square test to assess the overall correctness of the trajectory model, followed by the t-test to test the significance of each parameter further, and then use the optimized model to refit and reanalyze GNSS time series. The analysis of the velocity results illustrates that the fitting accuracy of GNSS time series is 3–6 mm in the horizontal direction and 4–9 mm in the vertical direction. Lastly, we obtain a refined global three-dimensional velocity field based on GNSS three-decade time series, with the median velocity of Root Mean Square Error (RMSE) as 0.17, 0.17, and 0.32 mm/a in N/E/U direction. Compared with ITRF2014, the velocity difference is at 1–2 mm/a level due to differences in GNSS observations, trajectory model, and geodetic technology." @default.
• W4283735264 created "2022-07-01" @default.
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• W4283735264 date "2022-10-01" @default.
• W4283735264 modified "2023-10-16" @default.
• W4283735264 title "The refinement of reprocessed GNSS three-decade displacement trajectory model with spectral analysis and hypothesis test" @default.
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• W4283735264 doi "https://doi.org/10.1016/j.asr.2022.06.041" @default.
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