CAT ll/lll Accuracy and Availability for Local Area Differential GPS Including Geostationary Satellite and Pseudolite Augmentations

Mitch Sams

Abstract:	In the coming year the subject of Category II/III Local Area Differential GPS (LADGPS) architecture requirements will be more closely examined by both industry and government. Introducing a new system concep< particularly one involving a new technology such as DGPS, into the US NAS can be a long, diflicult, and frustrating process. Gaining international acceptance can further increase the time to implement in an almost exponential manner. This is especially true for the Category II/III requirement in which the international community is heavily involved. This paper presents the results of a study conducted by Wilcox to evaluate future CAT IIAlI LADGPS architecture possibilities, their resultant accumcy/availability trade&s and certification considerations. Considered in this paper is a high-accuracy coarse acquisition (c/A) code Differential GPS system utilizing existing ILS Glide Slopes as a transitional element when necessaq to expedite certification Ul . This system is then considered with a GPS only constellation; a GPS constellation with geostationary satellite augmentation (i.e. WAAS); a GPS constellation with pseudolite augmentations and finally a GPS constellation with both geostationary satellite and pseudolite augmentations. A Wilcox-developed availability~accuracy model provides an analysis of all of these system configurations. This model is a continuing cooperative effort between Wilcox and GPS Silicon Valley (A.J. Van Dierendonck and Quyen Hua).
Published in:	Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995) June 5 - 7, 1995 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	481 - 490
Cite this article:	Sams, Mitch, "CAT ll/lll Accuracy and Availability for Local Area Differential GPS Including Geostationary Satellite and Pseudolite Augmentations," Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995), Colorado Springs, CO, June 1995, pp. 481-490.
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