Indoor Navigation Using A GPS Receiver

Stefan Soderholm, Tuomas Juhola, Timo Saarnimo, Vesa Karttunen and Timo Toivanen

Abstract:	The purpose of our research is to demonstrate a concept for indoor navigation. This concept utilizes a set of pseudolites, a Master Control Station and GPS receivers. We have developed our own pseudolite hardware and the iTrax02 GPS receiver has been integrated into an extension sleeve for the iPAQ PocketPC PDA. The system is designed for large indoor areas and in the future this system could increase the usability of GPS receivers significantly. The pseudolite signal structure has been optimized for indoor use and the iTrax02 embedded software has been modified for pseudolite signal decoding and indoor navigation. The Near-Far problem has largely been eliminated by an appropriate selection of pseudolite antennas with suitable radiation patterns. If required the pseudolite signal can also be pulsed. Multipath rejection algorithms have been tested and are to be integrated into the receiver software and this, together with the receiver Zoom Correlators will minimize the problems with multipath. Multipath effects are also suppressed by using pseudolite antennas with optimized radiation patterns. We believe that the presented system will be able to provide user positions with a position error of less than 5 meters in suitable indoor areas.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	1479 - 1486
Cite this article:	Soderholm, Stefan, Juhola, Tuomas, Saarnimo, Timo, Karttunen, Vesa, Toivanen, Timo, "Indoor Navigation Using A GPS Receiver," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 1479-1486.
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