Hybrid positioning system
Hybrid positioning systems are systems for finding the location of a mobile device using several different positioning technologies. Usually GPS (Global Positioning System) is one major component of such systems, combined with cell tower signals, wireless internet signals, Bluetooth sensors or other local Positioning Systems.[1][2]
These systems are specifically designed to overcome the limitations of GPS, which is very exact in open areas, but works poorly indoors or between tall buildings (the urban canyon effect). By comparison, cell tower signals are not hindered by buildings or bad weather, but usually provide less precise positioning. Wi-Fi signals may give very exact positioning, but only in urban areas with high Wi-Fi density - and depend on a comprehensive database of Wi-Fi access points.
Hybrid positioning systems are increasingly being explored for certain civilian and commercial location-based services and location-based media, which need to work well in urban areas in order to be commercially and practically viable.
Different hybrid positioning systems are currently being developed and used in services from Combain Mobile[3], Navizon, Xtify, PlaceEngine, SkyHook[4], Devicescape, Google Maps for Mobile[5], openBmap for application in smartphones. The maturity of the approaches used by these systems needs to be proved in operational use.
Early works in this area include the Place Lab project, which started on 2003 and went inactive in 2006.
[edit] See also
[edit] References
- ^ Innovation: Hybrid Positioning http://www.gpsworld.com/gnss-system/algorithms-methods/innovation-hybrid-positioning-9628
- ^ Skyhook Wireless - How it works. http://www.skyhookwireless.com/howitworks/xps.php
- ^ Combain Mobile http://www.combain.com/
- ^ Skyhook Wireless http://www.skyhookwireless.com/
- ^ http://www.google.com/googleblogs/pdfs/google_submission_dpas_wifi_collection.pdf
