Overview of the FAA's Differential GPS CAT III Techncial Feasibility Demonstration Program

Robert Loh, Curtis Shively, and Ray Sweider

Abstract:	FAA and NASA have established a joint progrzun to evaluate the technical feasibility of using guidance from the satellite-based NAVSTAR Global Positioning System (GPS) for Category III (CAT III) precision approaches. A combination of analyses, simulation tests and flight tests will be used to evaluate Differential GPS (DGPS) techniques for CAT III applications. Emphasis will be placed on meeting accuracy and integrity requirements for a complete DGPS-based CAT III autoland capability. Contractors will be requested to supply the ground and airborne equipment for computing the DGPS-based aircraft position and velocity. Contractors will also provide their own aircraft completely equipped with a DGPS-based capability. Feasibility will be demonstrated by meeting either sensor accuracy requirements for Instrument Landing System (KS) CAT III applications or Total System Error (TSE) requirements currently under development. Additionally, the existing FAA Advisory Circulars for CAT II, CAT III and autoland approaches should be used as a guide for system development. It is expected that meeting TSE rcquircments would place less demand on the performance of the DGPS-based sensor than meeting ILS- based navigation sensor requirements. This paper gives an overview of the DGPS CAT III system architecture, requirements and demonstration program.
Published in:	Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993) June 21 - 23, 1993 Royal Sonesta Hotel Cambridge, MA
Pages:	155 - 162
Cite this article:	Loh, Robert, Shively, Curtis, Sweider, Ray, "Overview of the FAA's Differential GPS CAT III Techncial Feasibility Demonstration Program," Proceedings of the 49th Annual Meeting of The Institute of Navigation (1993), Cambridge, MA, June 1993, pp. 155-162.
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