global positioning system

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Global Positioning System:

see navigation satellitenavigation satellite,
artificial satellite designed expressly to aid the navigation of sea and air traffic. Early navigation satellites, from the Transit series launched in 1960 to the U.S. navy's Navigation Satellite System, relied on the Doppler shift.
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global positioning system


A satellite-based coordinate positioning tool and navigation system that can rapidly and accurately determine the latitude, longitude, and altitude of a point on or above the Earth's surface. It is based on a constellation of 24 satellites orbiting the Earth at a very high altitude and uses a form of triangulation based on the known positions and distances of three satellites relative to the surface of the Earth. First developed by the US Department of Defense to provide the military with a state-of-the-art positioning system, GPS receivers are now small enough and economical enough to be used by the general public. In meteorology and climatology, GPS receivers are increasingly used, for example, in radiosondes, and have experimentally been used in the measurement of integrated (total column) precipitable water vapor.

Global Positioning System

[′glō·bəl pə′zish·niŋ ‚sis·təm]
A positioning or navigation system designed to use 24 satellites, each carrying atomic clocks, to provide a receiver anywhere on earth with extremely accurate measurements of its three-dimensional position, velocity, and time. Abbreviated GPS.

global positioning system (GPS)

A satellite-based radio-positioning, navigation, and time-transfer system operated by the U.S. Department of Defense. The space segment of the system consists of a constellation of twenty-four satellites in six orbits inclined at 55° to the equator. Twenty-one of these satellites are active while the others remain in standby mode. The system provides highly accurate position and velocity information and precise time, on a continuous global basis, to an unlimited number of properly equipped users. The system is unaffected by weather and provides a worldwide common grid reference system. The GPS concept is predicated upon accurate and continuous knowledge of the spatial position of each satellite in the system with respect to time and distance from a transmitting satellite to the user. The GPS receiver automatically selects appropriate signals from the satellites in view and translates these into a three-dimensional position, velocity, and time. The system accuracy for civil users is normally 300 ft (100 m) horizontally. The constellation of satellites for a similar system operated by the Russian Federation is called GLONASS. See global navigation satellite system.

Global Positioning System

(GPS) A system for determining postion on the Earth's surface by comparing radio signals from several satellites. When completed the system will consist of 24 satellites equipped with radio transmitters and atomic clocks.

Depending on your geographic location, the GPS receiver samples data from up to six satellites, it then calculates the time taken for each satellite signal to reach the GPS receiver, and from the difference in time of reception, determines your location.

References in periodicals archive ?
com), the premier global media brand which addresses Global Positioning System (GPS)-related technologies from design to application, aiding key vertical industry and government decision-makers in the specification, purchasing, and integration of global positioning technologies to achieve business and organizational benefits.
In May, Continental announced its intent to become the first commercial carrier to operate using the satellite-based Global Positioning System and today's announcement is the culmination of months of testing, analysis, and installation of GPS.
GPS Made Easy: Using Global Positioning Systems in the Outdoors by Lawrence Letham is a good guide to using a GPS receiver.
Trimble is a leading innovator of Global Positioning System (GPS) technology.
The Geodetic Surveyor(4000SSE) uses Global Positioning System satellites and Trimble's FastStatic(TM) surveying technique to establish precise control points faster than a crew with a total station.
is a fabless semiconductor company developing global positioning system (GPS) and other satellite navigation technologies and products.
Trimble is an innovator of Global Positioning System (GPS) technology.
and south of the San Gabriel Mountains,'' said Frank Webb, a JPL geophysicist and chairman of the Southern California Integrated Global Positioning System Network.
Twenty global positioning system receivers - hand-held units that pinpoint locations and landmarks - were donated this week by Magellan Systems Corp.
com), A Magnetic Hybrid Sensor/Amplifier That Will Simplify the Design and Improve the Performance of Small Portable Products Like Compass Watches, Global Positioning System (GPS) Receivers, and Wireless Telephones
Restrictions on the Pentagon's global positioning system - created 25 years ago to guide fighter jets, tanks and troops - will be removed for commercial users during the next five years.

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