GPS positioning system, GPS positioning method and GPS positioning terminal

The invention relates to the technical field of a method for correcting a radar measurement error, and specifically discloses a GPS positioning system, a GPS positioning method and a GPS positioning terminal. A cooperative target performs pure radial movement to observe a declination of a plot detected by a radar and a GPS plot, wherein the declination is used for correcting an angle error. The delay of GPS plot transmission only has an error in the radial distance, and in this way, the error between 0 degrees of the radar and a true north angle can be accurately corrected. The cooperation target performs pure tangential movement to form two arcs taking a station center as an arc center at the interface of a radar monitoring and operation terminal. The distance difference between the two arcs is a radar distance error, which needs to be corrected. The delay of the GPS plot transmission only has front and back errors in the angle, and does not affect the correction of the radar distanceaccuracy. The invention