The Air Route Surveillance Radar is used by the United States Air Force and the Federal Aviation Administration to control airspace within and around the borders of the United States. The ARSR-4 is the FAA`s most recent (late 80s, early 90s) addition to the `Long Range` series of radars, which are search radars with a range of at least {Convert......
Found on
http://en.wikipedia.org/wiki/Air_Route_Surveillance_Radar
(from the article `traffic control`) ...by radio direction-finding equipment. The radio technologies are able to transmit the heading and distance to an intended destination. These ...
Found on
http://www.britannica.com/eb/a-z/a/33
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