Precision Approach Using GPS And GLONASS

Paul M. Creamer and E. Michael Geyer

Abstract:	The vision of satellite-based precision approach, in which ILS or MIS-quality instrument approach procedures are available at any runway worldwide independent of ground equipment, is an extremely attractive one. This paper explores the potential of the GPS and GLONA0SS systems to make this vision areality. A fundamental difficulty in assessing the capability of satellite-based systems to meet precision approach requirements is the current lack of “official” requirements for precision approach using an earth-referenced RNAV system. A strawman set of RNAVprecision approach requirements is therefore developed based on analogy to the (station-referenced) ILS and MLS systems. The capabilities of the baseline GPS and GLONASS systems are shown to fall far short of meeting these requirements. A set of potential GPS and GLONASS enhancements is then considered, including differential operation, pseudolites, and geostationaty overlay. The potential of each enhanced configuration is quantified in terms achievable accuracy and availability. Key technical, organizational, and procedural issues requiring resolution are also identified for each proposed enhancement. Finally, a timeline for earliest practical implementation of a GPS/GLONASS precision approach capability is presented.
Published in:	Proceedings of the 1991 National Technical Meeting of The Institute of Navigation January 22 - 24, 1991 Sheraton San Marcos Hotel Phoenix, AZ
Pages:	331 - 339
Cite this article:	Creamer, Paul M., Geyer, E. Michael, "Precision Approach Using GPS And GLONASS," Proceedings of the 1991 National Technical Meeting of The Institute of Navigation, Phoenix, AZ, January 1991, pp. 331-339.
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