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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, IP addresses and network environment data.〔AlterGeo: About us http://platform.altergeo.ru/index.php?mode=about〕 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 positioning systems may give very exact positioning, 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. Early works in this area include the Place Lab project, which started on 2003 and went inactive in 2006. Later methods let smartphones combine the accuracy of GPS with the low power consumption of cell-ID transition point finding.〔(Energy-Efficient Positioning for Smartphones using Cell-ID Sequence Matching ) by Jeongyeup Paek, Kyu-Han Kim, Jatinder P. Singh, Ramesh Govindan〕 == See also == * Assisted GPS * Indoor positioning system (IPS) * Mobile phone tracking * Positioning system 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hybrid positioning system」の詳細全文を読む スポンサード リンク
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