This is a potential security issue, you are being redirected to https://csrc.nist.gov.
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 8323r1 under Global Positioning System from GPS GNSS