Air Force Space Surveillance System

The AN/FPS-133 Air Force Space Surveillance System, colloquially known as the Space Fence, was a U.S. government multistatic radar system built to detect orbital objects passing over America. It is a component of the U.S. space surveillance network, and according to the U.S. Navy was able to detect basketball sized (75 cm (30 in)) objects at heights up to 30,000 km (19,000 mi).

The system ceased operation in September 2013. Plans for a new space fence began with sites at the Kwajalein Atoll in the Marshall Islands, along with an option for another radar site in Western Australia. It became operational on March 28, 2020.

The operation's headquarters were at Dahlgren, Virginia, and radar stations were spread out across the continental United States at roughly the level of the 33rd parallel north.

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