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 email 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 ?
Under this order, the Comtech location technologies being utilised by the Southeast Asia-based operator include Cell-ID, Enhanced Cell ID (eCID), Observed Time Difference of Arrival (OTDOA), Assisted GPS (A-GPS), and Assisted Global Navigation Satellite System (A-GNSS) reference network position engines.
4GHz only) Assisted GPS and GLONASS Digital compass - or its equivalent Wi-Fi Cellular Blu
Key patents in the acquired assets describe methods used by mobile location systems that involve Assisted GPS (A-GPS), location calculation techniques that use timestamps associated with multiple RF transmission sources and systems that combine two prevalent location techniques (User Plane and Control Plane) into one platform.
The settlement agreements resolve all issues regarding the company's claim that the mobile devices, components and networks sold or supported by Verizon, Qualcomm, LG and Kyocera, incorporating assisted GPS technology, infringed on Exelis patent rights.
7-inch high-resolution display, 45-key QWERTY keypad, global high-speed wireless connectivity, and voice-connected turn-by-turn navigation and assisted GPS.
Lenovo will offer Qualcomm's latest Gobi multimode 3G (third-generation) mobile data chipset on ThinkPad laptops, allowing users to connect to the world's two major types of 3G networks and use assisted GPS for location-based services.
Written for researchers and engineers in the field of geographic positioning systems (GPS), this textbook explores the assisted GPS (A-GPS) technologies that have expanded rapidly in consumer markets in recent years.
The licensing deal is on Trimble's Global Navigation Satellite System (GNSS) patents related to designated wireless products and services involving location technologies, such as GPS, assisted GPS or Galileo.
The license agreement resolves all issues regarding the company s claim that the mobile devices and components sold or supported by Blackberry, incorporating assisted GPS technology, infringed Exelis patent rights.
It also supports Assisted GPS (AGPS) for improved startup performance.
Under the agreement CellPoint and Benefon are to join forces in providing Assisted GPS (A-GPS) location solutions to GSM, 2.
NYSE:A) today announced that Atheros has selected Agilent's Location Server Emulator software for testing Assisted GPS over the Secure User Plane.

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