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Trilateration is a technique used by the Global Positioning System (GPS) to determine positions at or near the surface of the Earth.
The phrase "trilateration" refers to the trigonometric law by which, given the lengths of all three triangle sides, the interior angles of a triangle can be calculated. This idea is expanded to three dimensions using GPS.
By calculating its distance from three or more Earth-orbiting satellites whose positions in space and time are known, a GPS receiver may determine its latitude and longitude. The receiver can determine a satellite's elevation and even its velocity if four or more are inside its "horizon." The Global Positioning System was developed by the American Department of Defense as a navigating tool.
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