The control part of GPS is composed of a monitoring system composed of several tracking stations distributed around the world. According to their different functions, these tracking stations are divided into main control stations, monitoring stations and injection stations. There is one main control station, which is located at Falcon Air Force Base in Colorado, USA. Its function is to calculate the satellite ephemeris and the correction parameters of the satellite clock according to the GPS observation data of each monitoring station. etc., and inject these data into the satellite through the injection station; at the same time, it also controls the satellite, issues instructions to the satellite, when the working satellite fails, dispatches the spare satellite to replace the failed working satellite. The control station also has the function of monitoring station. There are five monitoring stations. In addition to the main control station, the other four are located in Hawaii, Ascencion, Diego Garcia, and Kwajalein. The role of the monitoring station It is to receive satellite signals and monitor the working status of the satellites; there are three injection stations, which are located in Ascencion, Diego Garcia, and Kwajalein. The satellite ephemeris calculated by the control station and the correction number of the satellite clock are injected into the satellite.

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