Space Fence

[1] It was constructed and designed by Lockheed Martin, Northrop Grumman, and Raytheon starting in 2009, with it being declared operational in March 2020.

[1][4] The initial plans to upgrade the legacy Air Force Space Surveillance System were made in 2009.

[8] In 2014, Lockheed Martin awarded a contract for the Space Fence ground structures to General Dynamics.

[2] The Space Fence will use S-band radar and will track a larger number of small objects than previous space radars: "about 200,000 objects and make 1.5 million observations per day, about 10 times the number" made by existing or recently retired US assets.

[1] Countries with space situational awareness data-sharing agreements in place with the USAF include Australia, Japan, Italy, Canada, France, South Korea, and the United Kingdom.