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the global positioning system (gps), is currently the only fully-functional satellite navigation system. more than two dozen gps satellites are in medium earth orbit, transmitting signals allowinggps receivers to determine the receiver´s location, speed and direction. since the first experimental satellite was launched in 1978, gps has become an indispensable aid to navigation around the world,and an important tool for map-making and land surveying. gps also provides a precise time reference that is used in many applications including scientific study of earthquakes, and synchronization oftelecommunications networks. developed by the united states department of defense, it is officially named navs gps(navigation satelllite timing and ranging global positioning system). the satelliteconstellation is managed by the united states air force 50th space wing.
although the cost of maintaining the system is approximately us$400 million peryear, uncluding the replacement of agingsatellites, gps is free for civilian use as a public good.
the global positioning system (gps), is currently the only fully-functional satellite navigation system. more than two dozen gps satellites are inmedium earth orbit, transmitting signals allowing gps receivers to determine the receiver´s location, speed and direction. since the first experimental satellite was launched in 1978, gps has become anindispensable aid to navigation around the world, and an important tool for map-making and land surveying. gps also provides a precise time reference that is used in many applications includingscientific study of earthquakes, and synchronization of telecommunications networks. developed by the united states department of defense, it is officially named navs gps(navigation satelllite timing andranging global positioning system). the satellite constellation is managed by the united states air force 50th space wing.
although the cost of maintaining the system is approximately us$400 million...