Abstract:In recent years, all kinds of global and regional continuous GPS tracking station networks have been established around the world. We apply these networks to enhance the resolution and precision of existing global ocean tide models in coastal areas. In this paper, we obtain one-year PPP-based position time series of four stations (AC67, AC43, AC39, SHAO), and then extract and inverse the corresponding ocean tidal periodic information, specifically eight major tidal constituents of OTL, by using fast Fourier transformation (FFT). It is indicated that PPP-derived OTL agree well with those calculated by the DTU10, EOT11a, GOT4.8, TPXO.7.2 and FES2004 models, and the RMS (root mean squares) of the differences between them is at the millimeter level. It is demonstrated that the estimates of OTL displacement by the PPP technique are available