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Satellite Navigation The U.S. govt launched satellites that triangulate any spot on the globe and give your location if you have the device that receives their signal. For further clarification, GPS receiver units time a signal sent from a satellite and through the use of extremely accurate clocks, calculate the time it took for the signal to reach the receiver from the satellite. Knowing the speed that these signals travel allows the receiver to calculate a distance from the satellite which results in a line of position (LOP). Obtaining a minimum of three of these LOPs allows the receiver to accurately determine the receiver's position on the face of the earth. Having a fourth LOP will also allow the determination of the elevation, or height, of the receiver.

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βˆ™ 2009-02-01 16:43:14
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