| The Global Positioning System (GPS) is a worldwide radio-navigation system formed from 24 orbiting satellites and their ground stations. These satellites orbit the Earth every 12 hours at approximately 20,200 km. GPS uses the satellites in space as reference points for location here on Earth and the ground stations help satellites determine their exact location in space.
GPS provides position based on the method of "triangulation". The GPS receiver measures distance using the travel time of radio signals and correct for any delays the signal experiences as it travels through the atmosphere. |
