Abstract:Due to the small number and uneven distribution of tracking stations of BDS-2, GLONASS, Galileo satellites, it is necessary to obtain high-precision common parameters with GPS in the actual BDS-2/GLONASS/Galileo orbit determination process to improve orbit accuracy. In order to optimize the data processing strategy of joint orbit determination, it is necessary to analyze the influence of the common parameters in the joint orbit determination on the orbit. This paper analyzes the contribution of common station coordinates, tropospheric and receiver clock parameters, to multi-system joint orbit determination in the non-ionosphere combination from the theoretical point of view. Finally, we carry out single-system and multi-system joint orbit determination experiments. The experimental results show that the high-precision common parameters have a significant effect on the accuracy of the orbit determination of each single system. The accuracy of the orbit accuracy of the IGSO of BDS-2, GLONASS, and Galileo can be improved by almost 20%, and the orbit accuracy of the MEO of BDS-2 can be improved by almost 60%.