The GPS Program Office is working to enhance many of the capabilities provided by the current satellites and user equipment. In 2007, GPS added ten shared MSs that are (part of the National Geospatial-Intelligence Agency network) to increase the overall GPS accuracy for all users. Information from the MSs is processed at the MCS to update the satellites’ navigation messages to include commanding (telemetry). In 2007, GPS added 10 more shared monitor stations (part of the National Geospatial-Intelligence Agency – NGA network of monitor stations) increasing the overall accuracy of the system to all users. The MSs use GPS receivers to passively track the navigation signals on all satellites. The GPS-dedicated ground system consists of six USAF dedicated monitor stations (MS) and four ground antennas (GA) located around the world. The GPS Master Control Station (MCS), operated by the 50th Space Wing’s 2nd Space Operations Squadron (2 SOPS) at Schriever AFB, is responsible for monitoring and controlling the GPS satellite constellation. The design life of a GPS satellite ranges between 7.5 to 15 years. While circling the earth, the systems transmit signals on two different L-band frequencies. GPS satellites are launched from Cape Canaveral Air Force Station, Fla., into nearly circular 11,000-mile altitude orbits. The GPS constellation is nominally designed and operated, consists of six orbital planes, with a minimum of four satellites per plane. Support to an unlimited number of users and areas.A worldwide common grid that is easily converted to any local grid system.Extremely accurate, three-dimensional location information (latitude, longitude and altitude), velocity (speed and direction), and precise time.GPS provides 24/7/365 navigation services including: Receivers have been developed for use in spacecraft, aircraft, ships, land vehicles, and precision-guided munitions, as well as for hand carrying. The signals are so accurate, time can be figured to within a millionth of a second, velocity within a fraction of a mile per hour and location to within 100 feet. With the proper equipment, users can receive at least four satellite signals to calculate time, location and velocity. GPS satellites orbit the earth every 12 hours, emitting continuous navigation signals. The system is operated and controlled by the 50th Space Wing, located at Schriever Air Force Base, Colo. The Global Positioning System is a constellation of orbiting satellites that provides position, navigation, and timing data to military and civilian users globally.
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