Abstract:Based on observation data from the GRW1, ZHON and the surrounding 13 IGS stations in 2018, we compare and analyze the effects of different cut-off elevation angles, mapping function models and global ocean tide models on GNSS coordinate accuracy. The results show that the GNSS coordinate presents the highest accuracy when the cut-off elevation angle is 7°. Along with the increase or decrease of the cut-off elevation angle, the accuracy will decrease gradually. The double difference positioning accuracy calculated by VMF3 model is better than that calculated by the NMF, GMF and VMF1 models, the accuracy of the precise point positioning calculated by VMF3 is equivalent to that of GMF and VMF1 models. The effect of ocean tidal load on GNSS coordinate solution is subjected to the coordinate directions, and can reach the cm level in the elevation direction. The differences of the GNSS coordinates calculated by different ocean tide models can be disregarded.
WANG Zhaoyang,LU Yongduo,XING Zhe et al. Research on Influence of Satellite Cut-Off Elevation Angle, Tropospheric Mapping Function and Ocean Tide Model on Antarctica GNSS PPP[J]. jgg, 2020, 40(12): 1294-1298.