Estimation of ocean tide loading displacement based on dynamic precise point positioning technique
This study applied the kinematic precise point positioning(PPP)technique and utilized the vertical coordinate time series from five global navigation satellite system(GNSS)stations in Hong Kong,China to estimate ocean tide loading displacements(OTLD).These estimates were then compared with predictions from ocean tide models.Singular spectrum analysis(SSA)was employed to denoise the time series,assessing the impact of noise on the estimation of OTLD.The results indicate that SSA denoising significantly enhances the accuracy of the coordinate time series,with reductions in white noise and colored noise by 60.4%and 21.68%,respectively.After SSA denoising,the discrepancy between the inverted values of OTLD and model predictions decreases,demonstrating the positive effect of noise correction in improving inversion accuracy.The OTLD caused by the four main tidal components,namely M2,K1,K2,and O1 estimated by GNSS PPP shows discrepancies with ocean tide predictions,but the root mean square error of these discrepancies decreases after SSA denoising.This research confirms the feasibility of using the GNSS PPP technique to estimate OTLD and underscores the importance of denoising in enhancing estimation accuracy.
ocean tide loading displacementkinematic precise point positioningnoiseglobal navigation satellite system(GNSS)ocean tide model
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