Enhanced GPS Usage in Urban Environments

Kevin Liu and Mangesh Chansarkar

Abstract:	GPS has very limited usage in urban environments today due to satellite blockage and severe multipath reflections. This has led to the use of hybrid systems to enhance its usage for car navigation. These systems use a combination of gyroscopes, odometers, and GPS. GPS usage in these systems is limited to initialization, and to reset the system if it is lost. The limitation of these systems is the cost; further, it is difficult to make these systems portable. A standalone car navigation GPS receiver has been developed using a low cost chip-set with features of tracking low level and wide dynamic range signals, fast reacquisition and single satellite navigation for self sufficient navigation capability, and dual multipath rejection scheme to increase the navigation accuracy. Test results have been collected during live tests in San Francisco area and emulate tests using satellite signal simulators.
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	505 - 508
Cite this article:	Liu, Kevin, Chansarkar, Mangesh, "Enhanced GPS Usage in Urban Environments," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 505-508.
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