Integration of WAAS and LAAS

Warren Hundley, Mitch Sams and Wayne Dohhnan

Abstract:	The Wide Area Augmentation System (WAAS) is currently under full-scale engineering development with initial deployment scheduled for 1998. The WAAS will support flight operations in the NAS as a primary means of navigation for en route through Category I precision approach. Concurrently, a number of manufacturers are bringing to market Local Area Augmentation Systems (LAAS) which will provide Special Category I (SCAT I) precision approach service for private use. In the meantime, RTCA Special Committee (SC-159) is producing Minimum Aviation System Performance Standards (MASPS) for Category II/III precision approach. It is anticipated that LAAS will be available for public use Category I, II and III precision approach in the first half of the next decade. While both these GPS based systems will provide important service on a stand-alone basis, there are substantial performance enhancements to be achieved through integration of the best features of both systems. These performance gains are primarily in the areas of increased integrity, accuracy, continuity of function and availability. This paper describes a number of high level integrated WAAS/LAAS architectures which can provide increased performance, additional safety margin and operational flexibility over that which can be achieved by either the WAAS or LAAS by itself, yet not compromise the basic capability of either stand-alone system. Predications of the estimated gains in RNP performance margins for the integrated architectures are provided through the application of a comprehensive satellite navigation Service Volume Model (SVM).
Published in:	Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 17 - 20, 1996 Kansas City, MO
Pages:	1161 - 1169
Cite this article:	Hundley, Warren, Sams, Mitch, Dohhnan, Wayne, "Integration of WAAS and LAAS," Proceedings of the 9th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, MO, September 1996, pp. 1161-1169.
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