Title: GPS SIGNAL AVAILABILITY IN LAND MOBILE APPLICATIONS
Author(s): E. O. Frye
Published in: NAVIGATION, Journal of the Institute of Navigation, Volume 36, Number 3
Pages: 287 - 302
Cite this article: Frye, E. O., "GPS SIGNAL AVAILABILITY IN LAND MOBILE APPLICATIONS", NAVIGATION, Journal of The Institute of Navigation, Vol. 36, No. 3, Fall 1989, pp. 287-302.
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Abstract: This paper summarizes the results of a series of direct measurements conducted to characterize the GPS signal environment in land vehicular operations for a variety of highway, city, and railroad situations. The basic instrumentation for these observations consisted of a NAVCORE I (TM) GPS receiver configured to output key measurements to a microcomputer as a data recording device. The results of these tests are presented in tables of the percentages of distance traveled in which one or more and two or more satellite outages were encountered, and in histograms of the outage probabilities as functions of the distance durations of the outages. The equipment was installed both in a van-type vehicle for highway and city street tests, and in a “Hy-Rail” vehicle for operation on railroad tracks.