Accuracy analysis of single system pseudo range single point location in different areas

In order to explore the accuracy of pseudo-point single-point positioning in different systems in different regions, four singlesystem pseudorange singlepoint positioning models are established in this paper, and the positioning results of each single system are compared and analyzed. The GNSS data provided by MGEX is selected as a case study. The results show that each single system reflects different positioning effects in different regions. In the three directions of N, E and U, the positioning residuals of GPS mostly change between-5 and 5 m; the positioning residuals of GLONASS vary from-15 to 15 m. The positioning results of BDS in the Asian region are far superior to other regions, and the residual changes are more gradual. GALILEO is limited by the length of the period. For longer effective periods, the positioning results and GALILEO in three directions are stable, and the positioning accuracy can reach 5 m.