Abstract:Multi-GNSS can not only make full use of the advantages of different systems, but also improve the accuracy and reliability of GNSS navigation and positioning. Nevertheless, the unmodeled systematic deviation between GPS and BDS undermines inner compatibility and inter-operability. Focusing on this problem, the influence from unmodeled antenna phase center offsets of BDS on baseline solution is researched deeply in this paper, and the conclusion is validated with observation data. The results of our experiments show that systematic deviation between GPS and BDS indeed exists. After eliminating the influence of antenna phase center offsets, this systematic deviation remains.