RNP Tunnel-In-Space Considerations for Non-Precision Approach using GPS Augmented by the GIC

Per Enge, Robert J. Kelly, Jerald M. Davis, A.J. Van Dierendonck

Abstract:	This paper considers a navigation system comprised of GPS (with a nominal constellation of 24 satellites), two GIC satellites (visible everywhere in CONUS), baro-altimeter, and autonomous fault detection and isolation; and discusses whether or not such a system can meet the required navigation performance (RNP) for non-precision approach. The paper uses risk analysis and the tunnel-in-space methodology to make this determination. To date, the tunnel concept has been applied to the precision approach phase of flight where it has proven to be a very powerful paradigm. Fortunately, the tunnel is fundamentally applicable to all phases of flight, and this paper develops a tunnel for non-precision approach. Section 2 will briefly summarize the tunnel concept and the allocation of the risk to each of the FWP parameters - namely availability, integrity, continuity and accuracy. Then Section 3 discusses availability, and Section 4 discusses the other FWP parameters in the context of a tunnel incident and loss of aircraft risk. These sections allocate the FWP to the major GIC subsystems from which the specific subsystem requirements are developed. They also discuss whether or not a GIC-based system can meet the requirements of a sole means navigation system for non-precision approach.
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:	507 - 507
Cite this article:	Enge, Per, Kelly, Robert J., Davis, Jerald M., Van Dierendonck, A.J., "RNP Tunnel-In-Space Considerations for Non-Precision Approach using GPS Augmented by the GIC," 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. 507-507.
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