Flight Test Results in a Program to Develop New Terminal Instrument Procedures TERPS for Precision and WAAS Approaches.

Hazem Hejjo, John Fagan, Emanuel Darne

Abstract:	This paper will present an overview of preliminary test results in a program to develop new standards and criteria for WAAS and precision terminal instrument procedures. The results are being obtained in an ongoing test program at the University of Oklahoma for the evaluation of precision approaches using WAAS and GPS navigation systems in category A and B aircraft. The OU program is a coordinated partner program with the category C and D programs performed at the FAA Technical Center in Atlantic City. The navigation system used to conduct the flight tests consists of WAAS/GPS sensor, a laptop, and Gamma class WAAS navigator. Two different WAAS sensors are used. They are the Rockwell's EMAGR and the Universal's GSV1012. The EMAGR is capable of providing 5 Hertz position readings. Whereas the GSV is capable of providing 1 Hertz position readings. The laptop receives the data supplied by either sensor via an RS232 port. Then it reformats the data and sends them to the Gamma WAAS navigator via a second RS232. The Gamma navigator, manufactured by Allied Signal, steers the aircraft to fly a line in the airspace. In addition to the above navigation system, a position truth system is used in the data analysis. The truth system is a modified version of the Ashtech Z12. The modified Z12 receiver is capable of generating 5Hz differential GPS position. The preliminary precision flight test results that will be presented will encompass an analysis of the aircraft vertical and horizontal 1 total system error, 2 navigation system error, and 3 flight technical error. The results will also present a discussion of the Gamma class navigator performance and the pilot reactions to flying the procedures using the WAAS navigation system.
Published in:	Proceedings of the 1999 National Technical Meeting of The Institute of Navigation January 25 - 27, 1999 Catamaran Resort Hotel San Diego, CA
Pages:	741 - 749
Cite this article:	Hejjo, Hazem, Fagan, John, Darne, Emanuel, "Flight Test Results in a Program to Develop New Terminal Instrument Procedures TERPS for Precision and WAAS Approaches.," Proceedings of the 1999 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1999, pp. 741-749.
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