Abstract：We analyze the multi-GNSS precise point positioning(PPP) strategy in the polar region based on GNSS and PPP technology. Through one-station solution per day and multi-station solution per day, we analyze the PPP results under 11 different navigation satellite system combinations. We conclude that the positioning results of BDS and Galileo combination is the worst among all the combinations, and the difference in positioning accuracy between the combination and the average value is 0.4-1.3 cm. In the polar region, the mean of convergence time in the N direction of each combination is 7-11 min, and the mean of positioning accuracy is better than 1.3 cm, which is significantly better than that in the E and U directions. In the same condition, the convergence time of the three-system combination in the E, N and U is reduced by 10.3%, 14.1% and 7.3%, respectively, the positioning accuracy is increased by 9.6%, 4.6% and 11.7%, respectively, compared with the two-system combination. Compared with the three-system combination, the convergence time of the four-system is shortened by 6.8%, -2.1% and 2.0%, respectively, and the positioning accuracy is improved by 4.9%, -7.1% and 5.3%, respectively. The results show that the positioning performance of the three-system combination is better than that of the two-system combination, and the positioning performance of the four-system combination is less improved than that of the three-system combination.
