The main features of GPS: (1) Global, all-weather work. ①High positioning accuracy. The positioning accuracy of a single machine is better than 10m, and the differential positioning is adopted, and the accuracy can reach centimeter and millimeter levels. ②Multiple functions and wide application. Features of GPS system: high precision, all-weather, high efficiency, multi-function, easy operation, wide application, etc. 1. High positioning accuracy Application practice has proved that the relative positioning accuracy of GPS can reach 10-6 within 50KM, 10-7 at 100-500KM, and 10-9 at 1000KM. In the precision positioning of 300-1500M project, the plane position error of the solution observed for more than 1 hour is less than 1mm. Compared with the side length measured by the ME-5000 electromagnetic wave rangefinder, the maximum side length difference is 0.5mm. The middle error is 0.3mm. 2. The observation time is short. With the continuous improvement of the GPS system and the continuous updating of the software, at present, the relative static positioning within 20KM only takes 15-20 minutes; during the fast static relative positioning measurement, when the distance between each rover and the base station is Within 15KM, the observation time of the rover station is only 1-2 minutes, and then it can be positioned at any time, and each station observation only takes a few seconds.

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