The global positioning system consists of the following three parts: space
part (GPS satellite), ground monitoring part and user part. The GPS satellite
can continuously broadcast the ranging signal and navigation electrical text for
users for navigation positioning, and receive various information and commands
from the ground monitoring system to maintain the normal operation of the
system. The main function of the ground monitoring system is to track the GPS
satellite, carry out a distance measurement to determine the number of
satellites and the satellite clock correction number. After the forecast is
performed, the navigation electrical text is prepared in the prescribed format,
and the satellite is sent to the satellite through the injection station. The
ground monitoring system can also issue various instructions to the satellite
through injection stations, adjust the number of clock readings of satellites,
repair faults or enable spare parts. The user uses the GPS receiver to determine
the distance from the receiver to the GPS satellite, and finds its own three
-dimensional position, three -dimensional motion speed and clock difference and
other parameters according to the location of the observation given by the
satellite star in space. Essence The United States is committed to further
improving the functions of the entire system, such as determining satellite
tracks through mutual tracking between satellites to reduce the degree of
dependence on ground monitoring systems and enhance the autonomy of the
system.
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