Wikipedia: "The Air Force Space Surveillance System, colloquially known as the Space Fence, is a multistatic radar system that detects orbital objects passing over America. It is a component of the US space surveillance network, and is claimed to be able to detect objects as small as 10 cm (four inches) at heights up to 30,000 km (15,000 nautical miles.) Although formerly operated by the U.S. Navy and known as NAVSPASUR (short for "Naval Space Command Surveillance")[1], command passed to the Air Force 20th Space Control Squadron on October 1, 2004.[2] The operation's headquarters are at Dahlgren, Virginia, and radar stations are spread out across the continental United States at roughly the level of the 33rd parallel north."
http://en.wikipedia.org/wiki/Air_Force_Space_Surveillance_System Lockheed-Martin's site:
http://www.lockheedmartin.com/how/
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