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Global Positioning System – GPS

A system of satellites combined with receivers on the Earth that determines the latitude and longitude of any particular receiver through triangulation. The distance of the receiver to three of the satellites is ascertained by measuring the time-delay of a predetermined radio signal (called a pseudo-random code).

Errors in timing can be corrected by checking the signals against the signal from a fourth satellite. Current systems can pinpoint the location of the receiver with an accuracy of around 5 m (16 ft). The system is used for navigation, surveying, and many other applications. Compare loran.

Global Positioning System

Signals received from four satellites are used to determine the three-dimensional position of the receiver (vehicle). The receiver interprets the arrival times of the signals in terms of latitude, longitude, and altitude.