United States Space Surveillance Network

 

The Network consists of U.S. Army, Navy and Air Force operated, ground-based radars and optical sensors at 25 sites worldwide.

 

https://en.wikipedia.org/wiki/United_States_Space_Surveillance_Network

 

 

Figure 1: From Wikipedia -https://en.wikipedia.org/wiki/United_States_Space_Surveillance_Network

 

 

 

 

 

 

Former "Space Fence" - Air Force Space Surveillance System (ceased operation in 2013)

 

https://en.wikipedia.org/wiki/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 radarsystem built to detect orbital objects passing over America. It is a component of the US space surveillance network, and according to the US Navy was able to detect basketball sized (29.5 inches (75 cm)) objects at heights up to 30,000 km (15,000 nautical miles.)[1]

 

The system ceased operation in September 2013. Plans for a new space fence are underway with sites at the Kwajalein Atoll in the Marshall Islands, along with an option for another radar site in Western Australia.[2]

 

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.

 

There were three transmitter sites in the system:[3]

 

 Figure 1: From Wikipedia - "Part of the master transmitter antenna at Lake Kickapoo, Texas c.2001."