Algorithm Implementation and Result Analysis of Network-RTK Based on GPS／BDS

With the development of GPS modernization, as well as the implementation of China's BDII, GPS／BDS integrated navigation system in the field of various industries and countries in the asiapacific region are increasingly widespread application, RTCM increased the BDS ephemeris message and support BDS carrier phase difference makes the big dipper foundation system is more important to its application in various industries. In this paper, the basic model of relative positioning, a single base station RTKwith multiple base stations gps-rtk basic principle as well as the VRS positioning method, through collecting GPS／BDS observation,analysis of single base station of RTK and base station positioning results.The results show that if the distance between the station and the base station is shorter, both multi-base station and single base station positioning accuracy can be obtained by the centimeter-level positioning results. The positioning accuracy of GPS／BDS dual-frequency multi-station RTK can reach the accuracy of centimeter-level and can be of high availability when the distance between the mobile station and the base station is longer.