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A system for determining position by comparing radio signals from several satellites.
NIST SP 800-72 under Global Positioning System
The Global Positioning System (GPS) is a U.S.-owned utility that provides users with positioning, navigation, and timing (PNT) services. This system consists of three segments: the space segment, the control segment, and the user segment. The U.S. Space Force develops, maintains, and operates the space and control segments.
NISTIR 8323 from GPS GNSS