NAVSTAR Global Positioning System

NAVSTAR Global Positioning System (GPS)

NAVSTAR Global Positioning System (GPS)
The global positioning system (GPS) is based on a constellation of twenty-four satellites at 12,625 miles (20,200 km) above the earth in six orbits. Each of these satellites completes one orbit of the earth in 11 h and 58 min (i.e., two orbits in 23 h and 56 min). The acronym NAVSTAR stands for navigation by satellites and ranging. Any vehicle using the system must be equipped with a suitable receiver. The system uses time and ranging for determining precise navigational information. GPS signals are available at all points on the earth and provide 24-h navigation services, which include extremely accurate three-dimensional location information (latitude, longitude, and altitude), velocity, and precise time; a worldwide common grid that is easily converted to any local grid; passive all-weather operations; continuous real-time information; support to an unlimited number of users and areas; and support to civilian users at a slightly less accurate level.
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References in periodicals archive ?
1973: The Pentagon unveils the Navstar Global Positioning System, a satellite program intended to supplant separate (and jealously guarded) Navy and Air Force systems.
(16) Deputy Secretary of Defense, "Development Concept Paper Number 133: NAVSTAR Global Positioning System," May 11, 1974.
(31.) Navstar Global Positioning System Joint Program Office, "GPS Overview, Fact Sheet."
Number of satellites in the US NAVSTAR Global Positioning System (GPS)
Arnold was the program executive officer for Air Force space, responsible for the following: Air Force Satellite Control Network; space lift ranges; launch programs; the Evolved Expendable Launch Vehicle Program; the Space-Based Infrared System Program; military satellite communication programs; Navstar Global Positioning System programs; intercontinental ballistic missile programs; Defense Meteorological Satellite Program; as well as other emerging transformational space programs, such as space-based radar.
VX-30 was responsible for the release of operational flight programs incorporating and integrating Navstar global positioning system navigation, APG-71 radar high-resolution mapping and the GBU-24 weapons system.
Among these, the Navstar Global Positioning System (GPS) has become renowned for its highly accurate navigation, position, and timing signals, for which military and civilian users worldwide have found an astounding variety of applications.
Lockheed Martin Missiles and Space Co., King of Prussia, Pa., is being awarded a $17,000,000 modification to a firm-fixed-price contract to provide for seven Interim Retrofit Crosslink Transponder Data Units for the NAVSTAR Global Positioning System Block IIR satellite (vehicles 01 and 04 through 09).
The NAVSTAR global positioning system has been termed a global utility.
While the system is generally referred to as Global Positioning System, it is often called the Navstar Global Positioning System because it employs the Air Force's Navstar satellites.
This system, the NAVSTAR Global Positioning System (GPS), is affecting not only the traditional marine and aviation navigation users but is making great strides into the land navigation, surveying, and timing communities.