Effect Analysis of Ocean Tide Loading on GPS Precise Positioning Combining High Precision Local Tide Model with Global Ocean Tide Model

The accuracy and resolution of global ocean tide models established by satellite altimetry technology are often limited.The data from local offshore tidal models generated by long-term observation of local tide stations however, is highly precise and at high resolution and could be used to improve the accuracy of global ocean tide models. In this paper, we use the high accuracy local tidal data from the East and South China Seas to refine the local area of the HAMTIDE11A.2011 global ocean tide model. We also analyze the effect of ocean tide loading observed by elaboration and non-elaboration models on the precise positioning of GPS stations distributed across different areas. The results show that 1) the effects of ocean tide loading calculated by the global ocean tide model elaboration and non-elaboration with precise positioning from GPS stations have a millimeter level difference, and 2) the deduction results for the ocean tide loading effect computed by elaboration model with GPS precise positioning is better than the non-elaboration model using the fast Fourier transform method for the semidiurnal, diurnal and semiannual periods.