Influence of an error in the base station of code differential GPS

摘要

GPS (Global Positioning System) takes radio wave from several satellites, and it is a system getting a position and time of a user. Using the differential information with reference station, a DGPS user cancels the error that pseudorange includes. As for the correction data from reference station of DGPS, Japan coast guard has used a medium frequency beacon, and GPex has used FM multiplex data communication. It is necessary for reference station of another DGPS to be made in the area that cannot receive a message of correction data. We examined the influence that a position error of DGPS reference station and a measurement error of pseudorange gave to the DGPS use station.