A Wide Area Augmentation System (WAAS) Service Volume Model and Its Use in Evaluating WAAS Architectures and Design Sensitivities

Walter Poor, Thomas Albertson, and Pauline Yen

Abstract:	The Federal Aviation Administration Satellite Program Office, AND-510, is developing a Wide Area Augmentation System (WAAS) based on the Global Positioning System (GPS) to support a precision approach capability down to a Category I (CAT I) decision height (DH) of 200 feet. This paper reports on the development of a stochastic service volume model (SVM) to estimate the coverage for initial and end-state GPS/WAAS based on combinations of various system design elements. The SVM will be used to help validate the performance of proposed WAAS designs and to determine the sensitivities to design changes. Using statistical as well as deterministic input parameters, the model graphically identifies regions of WAAS coverage (system availability of accuracy, integrity, and continuity of service) for varying levels of navigation service down to Category I precision approach. This paper describes the model and shows how it can be used to analyze the availability of GPS/WAAS.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	629 - 637
Cite this article:	Poor, Walter, Albertson, Thomas, Yen, Pauline, "A Wide Area Augmentation System (WAAS) Service Volume Model and Its Use in Evaluating WAAS Architectures and Design Sensitivities," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 629-637.
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