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 ?
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.
Christoph Caselitz, the President of the Mobile Networks Division at Siemens Communications, said, "Global Locate's assisted GPS solutions lead the market in many key areas.
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.
NASDAQ: ZSTN) ("ZST" or the "Company"), a major developer, manufacturer and supplier of digital and optical network equipment to cable system operators and provider of GPS tracking devices and support services for transport-related enterprises in China, today announced that it has recently filed a patent application with the Chinese State Intellectual Property Office (SIPO) to ensure intellectual property protection for its Assisted GPS technology.
NYSE:A) today announced that Atheros has selected Agilent's Location Server Emulator software for testing Assisted GPS over the Secure User Plane.
For detecting the phone's location, Siddiqui stated that, HTC Fetch utilizes the Global Positioning System (GPS), Assisted GPS and mobile-tower triangulation tech.
Currently, 911 Assist is designed to provide location information to emergency service providers through assisted GPS or signal triangulation - the same system providers rely on when dispatching help to mobile phone user emergency calls.

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