Synchronized Pseudolites - The Key to Indoor Navigation

Stefan Söderholm and Timo Jokitalo

Abstract:	The primary goal of our research is to build a practical system for indoor navigation using GPS pseudolites. Our concept uses a set of pseudolites, a Master Control Station and mobile GPS receivers. The system is designed as an independent positioning system with dedicated receivers. However, it will be possible to modify the receivers to track both GPS and pseudolite signals. This system could significantly extend the usability of GPS receivers into large indoor areas in the future. The system is designed to be user friendly, robust and inexpensive. In this paper we present the initial test results from our first proof of concept. The purpose of this small scale project was to verify the system design and identify possible improvements to it. The initial test results have shown that the proposed system is able to provide GPS like navigation services in indoor locations. A new generation of the pseudolite hardware has since been designed and is currently being built and tested.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	226 - 230
Cite this article:	Söderholm, Stefan, Jokitalo, Timo, "Synchronized Pseudolites - The Key to Indoor Navigation," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 226-230.
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