Projected Navigation System Requirements for Intelligent Vehicle Highway Systems (IVHS)

D. Jim Chadwick

Abstract:	The IVHS Program seeks to apply advanced computer, communications and navigation technologies to solve congestion, safety, environmental and intermodal ridership problems in surface transportation. IVHS- equipped vehicles will receive real-time updates on the state of the road network, which they will use in conjunction with known position to compute optimal routing between a trip’s origin and destination. However, the derivation of this “known position” is not a simple matter, since the physical environment in which the IVHS vehicles will operate is far from benign. Reliance solely on Standard Positioning Service (SPS)-grade GPS positioning will not be possible, both because of satellite visibility problems in city cores, and because accuracies substantially better than the 100 meter SPS value are required. Dead reckoning/map matching systems alone are prone to bias errors that are greater than IVHS thresholds. This paper will provide an overview of the IVHS program as it relates to navigation systems, followed by a review of the navigation system requirements that have been developed to date. It will conclude with a discussion of some alternative navigation system architectures that are being considered, including DGPS options, and will present projections of future refinements in surface vehicle navigation systems that would be desirable.
Published in:	Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994) September 20 - 23, 1994 Salt Palace Convention Center Salt Lake City, UT
Pages:	485 - 490
Cite this article:	Chadwick, D. Jim, "Projected Navigation System Requirements for Intelligent Vehicle Highway Systems (IVHS)," Proceedings of the 7th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1994), Salt Lake City, UT, September 1994, pp. 485-490.
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