GPS AVAILABILITY, PART 1: AVAILABILITY OF SERVICE ACHIEVABLE FOR DIFFERENT CATEGORIES OF CIVIL USERS

J-M. Durand, T. Michal, and J. Bouchard

Peer Reviewed

Abstract:	GPS will offer extremely high navigation performance and has a promising future for most civil navigation needs. However, certain users consider that it may have insticient integrity and limited availability. This paper describes a method for determining the availability ofthree different GPS services (positioning, supplemental navigation, and sole means navigation) when users also operate complementary equipment. The method is relevant to several different scenarios: two-dimensional or three-dimensional applications; different navigation phases in which GPS is being used and induced positioning accuracy requirements; and various GPS constellations, possibly supplemented by geostationary satellites. It will be shown that GPS availability is highly sensitive to all these parameters. The application discussed is the nonprecision approach phase in civil aviation, where a 21-satellite and a 24-satellite constellation are considered. The results are then extended to other flight phases and maritime users. Part II of this paper, containing state-probability analyses of 21- and 24satellite constallations, will be published in the Fall 1990 issue of this journal. The results of Part II are a major input to Part I.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 37, Number 2
Pages:	123 - 140
Cite this article:	Durand, J-M., Michal, T., Bouchard, J., "GPS AVAILABILITY, PART 1: AVAILABILITY OF SERVICE ACHIEVABLE FOR DIFFERENT CATEGORIES OF CIVIL USERS", NAVIGATION: Journal of The Institute of Navigation, Vol. 37, No. 2, Summer 1990, pp. 123-140.
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