WiFi Assisted GPS for Extended Location Services
This paper shows a lightweight technique for extending the positioning capabilities of a global navigation satellite system to areas characterized by reduced satellite visibility. This technique includes the presence of a WiFi coverage, used to implement the virtual satellite concept. In particular we assume that a customer terminal can receive both Global Positioning System (GPS) signals and WiFi beacons broadcasted by an access point (AP). We show that if such beacons include the geo-referenced position of the relevant AP, the suitable usage of this information allows determining the GPS receiver position even if only three satellites are visible. Experimental results show that the achievable performance are similar to that obtainable by a plain GPS receiver using four visible satellites.
KeywordsWiFi GPS hybrid positioning performance analysis
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- 1.Project ICT-217033 “WHERE”, Delivrable D1.1, Performance assessment of Hybrid data fusion and tracking algorithms (December 2008)Google Scholar
- 2.Singh, R., Guainazzo, M., Regazzoni, C.: Location Determination using WLAN in Conjunction with GPS Network. In: IEEE VTC 2004-Spring, Milan, Italy, May 17-19 (2004)Google Scholar
- 5.Abel, J., Chaffee, J.: Existence and uniquesses of GPS solutions. IEEE Transaction on Areospace and Electronic Systems 27(6), 951–952 (1991)Google Scholar
- 7.Makrand, S.: Recursive Method for optimum GPS satellite solution. IEEE Transaction on Areospace and Electronic Systems 27(2), 751–754 (2001)Google Scholar
- 10.ICD-GPS-200 Interface controll document, ICD-GPS-200, Arinc Research Corporation, 11770 WarnerAve., Suite 210, Fountain Valley, CA (1991)Google Scholar
- 11.Gurtner, W.: RINEX: the receiver indipendent exchange format. GPS world 5(7), 49–52 (1994)Google Scholar
- 12.Laboratorio di Topografia, University of Perugia, http://labtopo.ing.unipg.it/
- 13.Brown, A.K., Olson, P.: Urban/Indoor Navigation using Network Assisted GPS. In: Proceedings of ION 61st Annual Meeting, Cambridge, MA (June 2006)Google Scholar
- 14.Davidson, P., Hautamki, J., Collin, J.: Using Low-Cost MEMS 3D Accelerometers and One Gyro to Assist GPS Based Car Navigation System. In: Proceedings of 15th Saint Petersburg International Conference on Integrated Navigation Systems (May 2008)Google Scholar
- 15.Di Sorte, D., Femminella, M., Reali, G.: Beacon-based Service Publishing Framework in Multi-service Wi-Fi Hotspots. EURASIP Journal on Wireless Communications and Networking, 1–18 (2007)Google Scholar