Research on pseudorange difference method based on virtual observations

Aiming at the problem that the coordinates of the base station of double-difference mode of pseudo-range differential service observation cannot be transmitted on-line and the standard format of pseudo-range correction mode can not be compatible with BeiDou, based on the data of local area CORS network, this paper generates the comprehensive pseudo-range correction number of virtual grid, and further generates the virtual pseudo-range observation value, which can broadcast the pseudo-range to users in real time. Quasi-observed values and station coordinates are used for user differential positioning. Experiments show that virtual grid pseudo-distance difference can provide users with planar submeter-level and vertical positioning services superior to 1.5 m. By analyzing the experimental data, the optimal configuration scheme of grid difference is given. On the basis of solving the above two problems, this method solves the problem of a large number of concurrent users accessing the service algorithmally due to the constant calculation pressure of the server and no limitation of the number of users.