What is GPS?

GPS or Global Position System: It is all weather radio navigation system developed by US military in which individual receivers process data beamed down from satellites. lt provides three dimensional positions 24-hour-per-day a basis around the world.The space satellite system consists of 24 satellites in a circular orbit and with an orbital period of 12 hours. The orbits are inclined to the equator at 55 degree. The satellites carry an atomic clock moving and generating stable signals. These signals carry information about time and ephemeries of satellites. The ground receivers receive these transmitted signals to compute the position on the earth based on the satellite position. Most of the navigation systems use input from just one satellite receiver. This provides latitude, longitude and altitude on any spatial unit.