mobile positioning

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mobile positioning

The ability to pinpoint the location of a vehicle or mobile caller in transit. Also called "geotracking," these location-based services (LBS) are used for emergency purposes as well as proximity marketing, traffic updates, fleet management and asset and people tracking. They are also used for social purposes; for example, the WhosHere app for smartphones identifies other WhosHere users in the vicinity. Mobile positioning systems use the following methods to locate a person or vehicle. In some cases, all three are used (cellular, Wi-Fi and GPS).

Cell Towers
The most basic method is cell of origin (COO), which identifies the cell tower closest to the user; however, accuracy is typically around 1,500 feet. Using additional reference beacons and antennas, accuracy can be greatly improved with methods known as Enhanced Observed Time Difference (E-OTD), Time of Arrival (TOA) and Angle of Arrival (AOA). See E-911.

Wi-Fi and A-GPS
Wi-Fi hotspots are also used for location detection. Databases of known hotspots are constantly updated, and positioning accuracy can be within 100 feet. However, Wi-Fi only works well in dense urban areas, and it serves to augment cellular positioning rather than be the sole locating method.

GPS offers the greatest accuracy (15-75 feet), but requires line of sight to the satellites. Since this cannot be assured in cities with tall buildings, most smartphones employ Assisted GPS (A-GPS), which helps them get the initial fix on the satellites by obtaining orbit and clock data from nearby cell towers.

A-GPS Is Used to Track Everything
Assisted GPS (A-GPS) devices are available to track cars, pets, children as well as anything that may move or be moved. Users can locate the device on the Web or be alerted via e-mail or text message if the A-GPS device moves outside a defined area. See vehicle tracking, Wi-Fi, GPS and iBeacon.
References in periodicals archive ?
Rockwell Transportation Electronics businesses address a broad range of markets including: automotive electronics, driver information systems, mobile satellite communications and on-board computer systems, automatic vehicle location systems, traffic management systems, commercial avionics and railroad electronics.
Global Vehicle Tracking Systems is also supplying its Traffic Management Systems(TM) Automatic Vehicle Location software.
was founded in 1990 in Dallas, and holds a patent covering a variety of claims for Automatic Vehicle Location systems, including the transmission of GPS location data over cellular networks.
At the IVHS America Annual Meeting and Exposition, Rockwell introduced its FleetMaster automatic vehicle location system, which is designed to operate with existing communication equipment and improve the overall efficiency of fleet operations.
The FleetMaster automatic vehicle location system is a low-cost, turnkey approach that simplifies the multiple tasks involved in managing small or large mobile fleets which at the same time increases driver productivity, enhances the safety of the driver, vehicle and cargo and helps in emergency situations.
SkyLynx FlexNet is unaffected by trees, buildings or topographical variations, and its 80-mile range is far greater than that of cellular and 3G systems, making it an outstanding Automatic Vehicle Location and fleet management system.
And, of course, DRI is a leading supplier of transit communications equipment such as our TwinVision(R) and Mobitec(R) electronic destination sign systems, Talking Bus(R) voice announcement systems, Digital Recorders(R) Internet-based passenger information systems and automatic vehicle location and monitoring systems, and VacTell(TM) video actionable intelligence systems.
These estimates are updated constantly as the vehicles are tracked the NextBus system uses patented predictive software in conjunction with Automatic Vehicle Location (AVL) data to predict the actual vehicle arrival time.
Bus locations are tracked via an automatic vehicle location (AVL) system; NextBus processes the information, calculates predicted arrival times and transmits arrival time predictions to stationary and portable electronic displays and to the Internet.
Participants will have the opportunity to rigorously test new features under the scrutiny of formalized peer review procedures via simulated real-world scenarios such as selective transfer with multi-media data sharing, context-sensitive call queuing, VoIP E9-1-1 auto-location technologies, Automatic Vehicle Location (AVL) and Automatic Crash Notification (ACN).
The primary use of GDF is for automotive navigation systems, but it can be applied to transport and traffic applications, including fleet, dispatch and traffic management, traffic analysis and automatic vehicle locations.

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