mobile positioning

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mobile positioning

Pinpointing the location of a vehicle or mobile device. Also called "geotracking," mobile positioning is a location-based service (LBS) that is used for emergency purposes as well as proximity marketing, traffic updates, fleet management and asset tracking. Mobile positioning is also used for people tracking; for example, parents can install software in their children's smartphones to monitor their whereabouts (see Big Mother). To track a location, cellular networks, Wi-Fi and GPS are employed alone or in combination.

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 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 ?
AR mode is powered by instant motion tracking, a six degree of freedom tracking system built upon the technology that powers Motion Text in Motion Stills iOS and the privacy blur on YouTube to accurately track static and moving objects," TechCrunch quoted Google engineers Jianing Wei and Tyler Mullen from their blog post.
ARCore offers native APIs for motion tracking, environmental understanding, and light estimation.
ARCore concentrates on three things: motion tracking, environmental understanding and light estimation.
Whether used for computational photography, video recording, or for computer vision applications that require accurate motion tracking, its clear that power efficient camera image signal processing has become more important for the next generation of mobile user experiences, said Tim Leland, vice president of product management, Qualcomm Technologies Inc.
Cattolica del Sacro Cuore in Italy used a motion tracking system to measure the position of the patella as different loads and forces were applied to the knee model at various degrees of flexion, Medical Xpress reported.
This means there is no need for additional hardware aside from a depth sensor and motion tracking camera.
The fundamental principles behind the software are often referred to as motion tracking and digital image correlation (DIC), although Video Gauge has been independently benchmarked to be an order of magnitude more accurate than other image based measurement software, according to the company.
Fairchild has launched the FMT1000-series of highly accurate Motion Tracking modules, which enables the fast integration of motion intelligence into any system, including drones, autonomous vehicles, unmanned systems, heavy industry, construction, agriculture, VR headsets, and camera and platform stabilization.
Google's Project Tango is a technology platform that uses advanced computer vision, depth sensing and motion tracking to create on-screen 3D experiences, allowing users to explore their physical environments via their device.
The sensor effortlessly combines GPS and motion tracking technology with heart rate, thus providing extensive and most accurate performance data.
They feature 2D Wall Motion Tracking, spectral and color Doppler, and Toshiba's latest suite of guidance and workflow technologies.