Basic structure of GPS,How GPS Works

(1)Basic structure

1)GPS satellites

2)Ground control stations

3)User segment (GPS receivers)

1)GPS satellites

Many GPS satellites are located around six orbit around the Earth at an altitude of about 20,000 kilometers (four GPS satellites in an orbit), and roam around the Earth at an interval of 12 hours.

2)Ground control stations

Ground Control Station Satellite's Orbit is to play the role of Monitor, Control and Maintenance, to ensure that the deviation of satellites from orbit and GPS timing are within Tolerance level.

3)User segment (GPS receivers)

(2)How GPS Works

Global Positioning System (GPS) is a group of 32 satellites that are in orbit at 26,600 km above the Earth. Satellites are owned by the US Department, but no one can use the signals of these satellites, provided they have a receiver.

To perform the receiver's work, he should be able to see four satellites. You can download a minute or can take longer, then data from the satellite before positioning early detection turn on your receiver, these satellites signal.

Basically, it requires two things to work effectively:

1) GPS receiver measures the distance from a satellite itself, for that it measures the time of signals traveling at the speed of light.

2) When running the satellite's position, the GPS receiver must know that it is the radius which is a sphere which was measured with the center satellite.