Height of GPS satellite from the ground

There are 24 GPS satellites in the United States, with an average orbital height of 20,200 kilometers. Among the satellites that make up China's Beidou satellite navigation system, there are 5 geostationary satellites and 30 medium and high orbit satellites, of which the height of 30 medium and high orbit satellites is 2.13-2.150,000 km.

Extended data:

1, the GPS space satellite constellation consists of 2 1 working satellites and 3 in-orbit standby satellites. The 24 satellites are evenly distributed on six orbital planes, with an inclination of 55, an average altitude of 20200 km and an operating period of 1 1 h58min.

2. The satellite uses two radio carriers in L-band to continuously send navigation and positioning signals to users. Navigation and positioning signals contain the position information of satellites, making them dynamic known points.

3. In any place on the earth, at any time, above the altitude angle of15, an average of 6 satellites can be observed at the same time, and at most 9 satellites can be observed. GPS satellites generate two sets of codes, one is called C/A code (Coase/Acquisition Code/KOOC-0//KOOC-0/023 MHz) and the other is called P code (Precision Code/KOOC-0/0/KOOC-0/23 MHz).

4. The ground control part consists of a master control station, five global monitoring stations and three ground control stations. The monitoring station is equipped with an accurate cesium atomic clock and receiver, which can continuously measure all visible satellites.

5. Satellite observation data obtained by the monitoring station, including ionospheric and meteorological data, are transmitted to the main control station after preliminary processing. The main control station collects the tracking data of each monitoring station, calculates the orbit and clock parameters of the satellite, and then sends the results to three ground control stations.

6. When each satellite runs overhead, the ground control station injects these navigation data and the instructions of the main control station into the satellite. This injection is once a day for each GPS satellite, and the last injection is made before the satellite leaves the injection station. If a ground station fails, the navigation information pre-stored by the satellite can still be used for a period of time, but the navigation accuracy will gradually decline.

References:

Baidu Encyclopedia-Beidou Navigation Satellite