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

(GPS)

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]
(navigation)
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

(communications)
(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 ?
Geocaching uses Global Positioning System (GPS) receivers to locate stashes hidden by others, such as the one above, found by Hall at Point Mugu State Park.
Global positioning Systems (GPS) technology's contribution to the global economy has shown a steady growth in the last decade.
Tracking the worldwide growth of the GPS market, we have come out with a market research report, "World Global Positioning Systems Market Forecast (2006-2008)".
Accesses the capabilities and uses Global Positioning Systems equipment
In addition to onboard computers, the Sport Trac has stereo vision, a global positioning system (GPS) with two antennas, a special GPS processor, a dual inertial navigation system, four laser range finders, a radar sensor, and electronic interfaces.
The Company's products are included primarily in cellular phones, base stations, wireless local area networks (WLANs), cable television modems and global positioning systems (GPS).
Utilising only commodity-type services, readily available with well-defined interfaces, such as Global Positioning Systems, Wireless Networks, Internet, Web Services, and Instant Messaging, Alltigo is able to offer significant value to its customers for a fraction of the expense needed before.
WELLINGBOROUGH, England -- Sarantel, the leading global innovator in the design and manufacture of proprietary miniature antennas for portable and wireless devices, has been chosen by Alltigo to provide its GeoHelix Global Positioning System (GPS) antenna in a new Assisted-GPS (A-GPS) enabled asset management tagging solution.
The magnetic sensors market is also likely to witness a growth in revenues which is expected to be fueled by the increased usage of anti-lock braking systems (ABS) and navigation tools such as global positioning systems in the automotive industry.
Keywords in this release: world, magnetic sensor components, magnetic sensor modules, magnetic sensor subsystems, anti-lock braking systems, ABS, global positioning system, GPS, Hall effect sensors, magnetoresistive sensors, superconducting quantum interference device, sensors, SQUID, research, information, market, trends, technology, service, forecast
Founded in 1981, TeleType is at the forefront of Global Positioning Systems technology.
By combining Global Positioning System (GPS) technology with communication and location transmission into the GPS/Java enabled phone, TeleType offers customers an economical and easy-to-use system that can simultaneously track multiple vehicles.

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