Using Partial or Nonstandard GPS Solutions in Automative Navigation

Richard F. Poppen

Abstract:	In various implementations, GPS is coming into use in automotive navigation. In general, because of the limitations inherent in the use of GPS in the automotive environment, vehicular systems require a combination of GPS and self-contained relative navigation, such as dead reckoning and map matching, to provide continu- ous and sufficiently accurate navigation. In the automotive environment, especially in urban areas, it is often impossible to obtain signals from enough appropriately placed GPS satellites to deter- mine three- or even two-dimensional positions. In such environments, however, it may still be possible to re- ceive signals from two or three satellites located near the plane perpendicular to the earth and tangent to the street. With knowledge of the position and orientation of the street, it is possible to obtain a position in the street from two satellites, given altitude, or to obtain both position and altitude from three satellites. This paper describes how a vehicular navigation sys- tem could incorporate a GPS receiver capable of re- turning such position information, allowing the use of dead-reckoning sensors less accurate than those now required. Such systems would significantly enhance the utility of GPS in the demanding automotive environ- ment.
Published in:	Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993) September 22 - 24, 1993 Salt Palace Convention Center Salt Lake City, UT
Pages:	59 - 62
Cite this article:	Poppen, Richard F., "Using Partial or Nonstandard GPS Solutions in Automative Navigation," Proceedings of the 6th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1993), Salt Lake City, UT, September 1993, pp. 59-62.
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