Space Fence
From 1961 to 2013, the U.S. Air Force operated a ground-based radar network that detected objects in space passing over the United States. It's name was Air Force Space Surveillance System or simply Space Fence. It used VHF radio, running at 216.9 MHz. This relatively low frequency limited the size of objects that could be reliably detected.
A new space fence, based on S-band radar (2 to 4 GHz), and capable of detecting much smaller objects than the original space fence, is now being built in the Marshall Islands. Named the Kwajalein Space Fence, it is being built by Lockheed Martin. The system will require additional locations in the future. A likely location is Diego Garcia in the Indian Ocean, which already has a Ground Based Electro-Optical Deep Space Surveillance station.
San Diego, California, US
Active: 1961-2013
Elephant Butte, New Mexico, US
Active: 1961-2013
Red River, Arkansas, US
Active: 1961-2013
Silver Lake, Mississippi, US
Active: 1961-2013
Hawkinsville, Georgia, US
Active: 1961-2013
Tattnall, Georgia, US
Active: 1961-2013
Lake Kickapoo, Texas, US
Active: 1961-2013
Gila River, Arizona, US
Active: 1961-2013
Jordan Lake, Alabama, US
Active: 1961-2013
Kwajalein Atoll, Marshall Islands
Active: 2020-Present
Link: Lockheed Martin
