Global Positioning Systems (GPS)
Artificial Satellites
Nokia Phones

What is satellite navigation?

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February 01, 2009 4:43PM

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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