In 2016, the U.S. Air Force (USAF) continued to operate and maintain a large, combined-services ground network for its positioning, navigation, and timing (PNT) fleet, the Global Positioning System (GPS). Consisting of 15 monitoring stations and 11 command and control antennas, the network was comma...
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The Authoritative Guide to Global Space Activity, Packed with Over a Decade of Data, Resources, and Information.
