The Effects of Global Positioning System for Reliable Positioning, Navigation and Timing Services
The Global Positioning System (GPS) is a U.S. space-based radionavigation system that provides reliable positioning, navigation, and timing services to civilian users on a continuous worldwide basis - freely available to all. GPS provides specially coded satellite signals that can be processed in a GPS receiver, enabling the receiver to compute position, velocity and time. Basically GPS works by using four GPS satellite signals to compute positions in three dimensions (and the time offset) in the receiver clock. GPS provides accurate location and time information for an unlimited number of people in all weather, day and night, anywhere in the world.