GSP composition features

　　The global positioning system consists of three parts: (1) the ground control part, which consists of the main control station (responsible for managing and coordinating the work of the entire ground control system), the ground antenna (under the control of the main control station, injecting search messages into the satellite), the monitoring station (automatic data collection center) and communication auxiliary system (data transmission); (2) the space part, consisting of 24 satellites, distributed on 6 track planes; (3) the user device part, mainly composed of GPS receivers and satellite antennas.

　　The main features of GPS: (1) all-weather; (2) global coverage; (3) high-precision three-dimensional constant speed timing; (4) fast time-saving and high efficiency; (5) wide application.

　　1. High positioning accuracy

　　Single-click positioning accuracy is better than 10m, using differential positioning, the accuracy can reach centimeter and millimeter levels. 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 plane observed for more than 1 hour is less than 1mm. Compared with the side length measured by ME-5000 electromagnetic wave rangefinder, the difference in side length is 0.5mm at most. The middle error is 0.3mm.

　　2. Short observation time

　　With the continuous improvement of the GPS system and the continuous updating of the software, the relative static positioning within 20KM of the target only takes 15-20 minutes; during the fast static relative positioning measurement, when each rover is within 15KM from the base station, the rover will The observation time only takes 1-2 minutes, and then it can be positioned at any time, and it only takes a few seconds for each station to observe

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