Abstract:We analyze the static data collected by the geodetic receiver and smartphone by setting up two different occlusion environments. The results show that the smartphone receives some NLOS signals, and the satellite signals are obviously interfered by multipath effects. According to the characteristics of the NLOS signal and original GNSS measurement information of the smartphone, we design a scheme for screening the original GNSS data of the smartphone. The results of static positioning experiments show that the application of data screening scheme can significantly improve the positioning accuracy of smartphones in urban environment. The positioning accuracy of the smartphone SPP algorithm and the RTK positioning algorithm in the plane direction can be improved by 20%-40%, and the positioning accuracy in the elevation direction can be improved by 30%-60%.