Study on the influence of ocean tidal load on precise point positioning

A total of 85 IGS stations located inland, on the coast and on the islands are selected from around the world, and the position of these stations are solved by considering adding the global ocean tide model (GOT4.8) or not. The effect of ocean tidal load on the precise point positioning(PPP) accuracy of IGS stations in different geographical regions is analyzed and studied. The results show that ocean tidal load has the greatest impact on the station located on the island. After adding the ocean tide correction, about 91% of the positioning error of the island stations are improved, and the proportions of coastal stations and inland stations are about 85% and 82%, respectively. The ocean tide correction has almost no impact on the N direction of the station, and has little impact on the E direction, and has the greatest positive impact on the U direction. Among them, the impact range in the U direction of the island station is 2~8 mm, and that of some stations are close to the centimeter level.