GNSS Princop RNAV

The basic principle of GNSSGNSS —Global Navigation Satellite System is as follows:

• A satellite in a known position transmits a pulse at a time that is known by both satellite and user.
• The user times the time the pulse takes to arrives at his or her location.
• Using distance = speed x time and knowing the speed of light, the user can calculate a distance.
• This puts them on the surface of a sphere with the satellite at the centre and a radius equal to the distance just calculated.
• By intersecting multiple spheres, the range of potential positions can be narrowed down to just one location.