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Spatial awareness is identified as a key feature of today's mobile devices. While outdoor navigation has been available and widely used for some time already with the help of GPS, indoor positioning has not yet made it into mainstream life. GPS and other GNSS systems offer accuracy of a scale different to that required for efficient indoor navigation. Due to this and poor signal quality in urban environments, a lot of effort has been put into developing dedicated indoor locationing systems. However, many such systems use specialized hardware to calculate accurate device position, as readily available wireless protocols have so far not delivered accuracy close to what is desired. This research aims to investigate how a number of sensors such as a Digital Compass, Bluetooth, WiFi, and Accelerometer may be combined to calculate device position and orientation to perform directional querying in a spatial database. These four technologies were chosen because they appear in some mobile devices available today and are likely to become even more widespread in the nearest future.
Filonenko, V., Carswell, J.: Hybrid indoor positioning and directional querying on a ubiquitous mobile device. Proceedings of the 6th. International Symposium on LBS and TeleCartography, CGS, University of Nottingham, UK, 2nd. Sept. - 4th. Sept., 2009.