Global Locate Indoor GPS Chipset & Services

Frank van Diggelen

Abstract:	Indoor GPS, or more precisely High-sensitivity GPS, is a combination of Assisted-GPS (A-GPS) and massive parallel correlation. This paper describes a worldwide reference network that provides assistance data for AGPS receivers, and a GPS chipset that uses a massively parallel architecture, along with the assistance data, to provide unprecedented GPS performance. Both the network and the GPS receiver demonstrate performance improvements of 10× or greater over previous state-of-the-art. The worldwide reference network predicts GPS orbits ten days into the future. The GPS receiver achieves time-to-first-fix of 100 milliseconds, when outdoors, and 2 to 5 seconds when indoors. The receiver can power up, acquire satellites, and get an accurate fix when in the closed trunk of a car, inside office buildings, deep urban canyons, parking garages, or shopping malls. The paper also describes the chipset architecture, and shows how it is unlike any previous GPS receiver. By having enough correlators to observe all possible code delays simultaneously, the receiver removes the old distinction between acquisition and tracking. This makes it possible to integrate weak signals for hundreds of milliseconds, and thus acquire signals hundreds of times weaker than a standard GPS receiver.
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:	1515 - 1521
Cite this article:	van Diggelen, Frank, "Global Locate Indoor GPS Chipset & Services," 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. 1515-1521.
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