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Global Positioning System
Similar Terms: GPS,gps
GPS is a satellite navigation system used to determine ground position and velocity (location, speed, and direction).
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It is made possible by a "constellation" of 24 satellites that orbit the Earth, continually transmitting their changing position with time. The spatial distributon of the satellites allow ground receivers to continually be in contact with 4 satellites, allowing the receivers to collect this data and triangulate their own position to pinpoint their geographic location.
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The location accuracy is anywhere from 100 to 10 meters for most equipment and can be improved by using the Wide Area Augmentation System (WAAS) or Differential GPS (DGPS).
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The GPS is owned and operated by the U.S. Department of Defense but is available for general use around the world.
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