Self-Correct& Differential Global Positioning System

Randal A. Schreiber and Philip S. Noe

Abstract:	The Differential Global Positioning System (DGPS) is the latest craze in the world of GPS. With DGPS, two receivers are required to get an accurate fix on the user’s position. The concept introduced in this paper is Self- Correcting DGPS. With Self-Correcting DGPS, a user can get DGPS accuracy with a single receiver. The whole concept of Self-Correcting DGPS is to reduce the Intelligent Vehicle Highway System (IVHS) from a difficult four dimensional problem to an easy two dimensional problem. To accomplish this, the number of unknowns is decreased by taking the IVHS system off the highway and making it an IVRS (Intelligent Vehicle Railroad System) in its own coordinate system called Over Head, Cross Track, and On Track (OH, CT, and OT). When on a railroad track, it is known that the user is on the track, meaning that the OH and CT components are, without a doubt, zero. While this drastically reduces the error, it does not quite bring it into the DGPS range so a few more things must be known. If the exact user position (i.e. a benchmark) is occasionally known, the error using Self-Correcting DGPS can virtually be eliminated. The goal of this paper is to present the concept of the Self-Correcting Differential Global Positioning System. A mathematical model is presented for the Over Head, Cross Track, and On Track coordinate system as well as the frequency of benchmarks needed to reduce the error. This new innovation is the IVRS solution; it is also a new approach to the typical differential GPS problem. With further work, this can be implemented into the highway environment using stereoscopic vision, and other sensor inputs as needed to keep the Cross Track component at zero.
Published in:	Proceedings of the 1993 National Technical Meeting of The Institute of Navigation January 20 - 22, 1993 Parc 55 Hotel San Francisco, CA
Pages:	171 - 177
Cite this article:	Schreiber, Randal A., Noe, Philip S., "Self-Correct& Differential Global Positioning System," Proceedings of the 1993 National Technical Meeting of The Institute of Navigation, San Francisco, CA, January 1993, pp. 171-177.
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