Integration of a GSM Receiver with GPS for Integrated Navigation or for Quick Satellite Signal Acquisition

Etienne Favey, Daniel Megnet, Adrian Rempfler and Heinz Mathis

Abstract:	Using mobile phone signals for positioning in conjunction with GPS in a truly hybrid positioning solution sounds promising, as one type of signal tends to be better available where the other one is scarce. When speaking of utilizing mobile communication infrastructure, usually a bidirectional, operator dependent approach comes to mind. Yet the GSM signals may also be used by only passively listening to the base stations in view being operated by any network operator. A new approach of integrating a GSM receiver — without transmission part —with a GPS receiver is presented. The GSMreceiver can synchronize itself to any visible base station of its own choice. Apart from collecting knowledge about the base station identification, its clock frequency as well as its clock phase is measured for later use. A special hardware prototype consisting of a combined GSMand GPS receiver is presented, as well as the basic algorithms used for integration. Preliminary results from field trials are presented with an analysis of the achievable time and position accuracy using such an integrated approach.
Published in:	Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005) September 13 - 16, 2005 Long Beach Convention Center Long Beach, CA
Pages:	1425 - 1432
Cite this article:	Favey, Etienne, Megnet, Daniel, Rempfler, Adrian, Mathis, Heinz, "Integration of a GSM Receiver with GPS for Integrated Navigation or for Quick Satellite Signal Acquisition," Proceedings of the 18th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2005), Long Beach, CA, September 2005, pp. 1425-1432.
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