All frequencies used to generate the satellite navigation signal – carriers, code and information ones – are obtained by coherent transformation (multiplication and division) from one reference frequency.
The ground (management) segment of the GPS navigation system consists of five tracking stations, evenly distributed around the globe, mainly near the equator, three loading stations and a master one.
The navigation system can be divided into three main segments. This is the control (or ground), space and user segments.
The basic principle of the global positioning system is quite simple. Satellites play the role of radio beacons.