Ubiquitous WiFi/GNSS Positioning System - TOA Based Distance Estimation

Kazimieras Bagdonas, Kai Borre

Abstract:	This paper presents an investigation of a WiFi positioning system (WPS) from a new project “UbiquitousWiFi/GNSS Positioning System” initiated at Aalborg University. The paper focuses on issues of the Time Of Arrival (TOA) based positioning. We present a novel methodology for precise TCP/IP packet-based TOA measurements. The delays and ambiguities in TOA in a WPS are determined from nondeterministic behavior of software and low timing resolution in hardware. Previously reported approaches have tried to overcome such problems by introducing aid from external hardware. We present a novel approach for precise TOAmethodologies using Hard Real Time enabledOS.We are focusing on software based WPS due to its flexibility and generality over a number of existing infrastructure devices. This paper presents TOA observations obtained by a software developed for off-the-shelf Access Points and finally we make an analysis of the results
Published in:	Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008) September 16 - 19, 2008 Savannah International Convention Center Savannah, GA
Pages:	1773 - 1779
Cite this article:	Bagdonas, Kazimieras, Borre, Kai, "Ubiquitous WiFi/GNSS Positioning System - TOA Based Distance Estimation," Proceedings of the 21st International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2008), Savannah, GA, September 2008, pp. 1773-1779.
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