The ground control station plays an important role in controlling satellite operation and ensuring communication between heaven and earth, and is the key behind the scenes for GNSS to operate stably and provide reliable services. According to different implementation functions, it is mainly divided into three parts: monitoring station, main control station, and injection station.

　　The monitoring station is an automated data collection center, which mainly collects pseudo range values between satellites in the field of view, meteorological data (temperature, pressure, relative humidity, etc.), and sends them to the main control station after preliminary processing.

　　The main control station is the core part of the ground control station. Responsible for collecting data from monitoring stations and calculating the data that needs to be sent back to satellites; Also monitor the status of the satellite and send control commands to the satellite in a timely manner; Finally, it is necessary to manage and coordinate the work of various parts of the ground control station.

　　The injection station is responsible for writing the data (satellite ephemeris, clock deviation, control instructions, etc.) calculated by the main control station into the satellite through a large aperture transmission antenna in a certain format.

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