The ground monitoring part is composed of five ground stations distributed around the world. It can be divided into three types: monitoring station, main control station and injection station according to function. The monitoring station is equipped with dual -frequency GPS receiver, high -precision atomic clock, meteorological parameter tester, and computer. The main task is to complete the continuous observation of the GPS satellite signal, and transmit it to the collected data and local meteorological observation data after processing it to Main control station. In addition to coordinating the management of the ground monitoring system, the main control station is also responsible for combining the observation data of the monitoring station, calculating the satellite's star calendar, satellite clock difference and atmospheric correction parameters, and sending these data into navigation electrical texts to the injection station; in addition It can also adjust the satellite that deviates from the track, so that it can run along the scheduled track, and dispatch the spare satellite to carry out the work that replaces the failure satellite. The main task of the injection station is to inject the navigation electrical text compiled by the main control station, the calculated satellite star calendar, and the number of corrections of the satellite clock.

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