A Preliminary Comparison Between WAAS and LAAS Flight Test Results

John Fagan, Walter Ross, Barry Billman, Ralph Sexton and Gerry McCartor

Abstract:	This paper presents a comparison between WAAS and LAAS Cat 1 systems used for single segment approaches to landing using Cat A, B, and C aircraft. The test flights, both WAAS and LAAS were made as the result of a joint program between the FAA Technical Center in Atlantic City and the University of Oklahoma for development of new TERPS standards and criteria for using the WAAS and LAAS systems as Cat 1 landing systems. In each of the sets of flight tests the Cat A and B airplanes were the same and the pilot pool was similar. The Cat C tests were conducted at the FAATC using FAA flight test pilots. A comparison will be made with a comparative look at the Navigational system Error (NSE), Flight Technical Error (FTE), and the Total System Error (TSE). The WAAS tests were made with a combination of the NSTB and the WAAS signal in final form, both were MOPS compliant for the purpose of TERPS testing. Pilot reaction to both systems will be reported as part of the paper. The paper will present a preliminary comparison of the iso-probability surfaces based on the data to date. The paper does not address availability, continuity and integrity associated with precision approach service, multiple runways and high volume traffic lower than Cat 1. The paper will also detail the nature of each of the WAAS and LAAS navigators and the reference stations used with LAAS.
Published in:	Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002) September 24 - 27, 2002 Oregon Convention Center Portland, OR
Pages:	1966 - 1974
Cite this article:	Fagan, John, Ross, Walter, Billman, Barry, Sexton, Ralph, McCartor, Gerry, "A Preliminary Comparison Between WAAS and LAAS Flight Test Results," Proceedings of the 15th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2002), Portland, OR, September 2002, pp. 1966-1974.
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