Ionospheric Specification for the Wide Area Augmentation System (WAAS) Simulation Studies

Steven Chavin

Abstract:	As part of ISTI’s ionospheric modeling program to support and to test the WAAS system algorithms we are creating a set of magnetic storm models, as well as a set of models for the undisturbed ionosphere. The goal of the magnetic storm modeling program is to create realistic storm models, which span the range of possible ionospheric effects. We report in this paper on an ionospheric specification to determine the theoretical limit of the capability of the WAAS system to handle storms and to determine the range of effects that our storm scenarios should cover. The ionospheric specification is not concerned with the magnitude of the TEC, since the WAAS system will be able to operate successfully regardless of the TEC values. The specification is only concerned with the variability in space and time of the vertical TEC and how different the vertical distribution is from the distribution assumed by the algorithms. To that end we have created a set of ionospheric storminess parameters. The ionospheric specification is intended to be used as a guide to our simulation program. The set of ionospheric scenarios that we have included and plan to include in our simulation program have been chosen to span the range of ionospheric storminess parameters. For each scenario the values of the ionospheric storminess parameters provide the testing program with a quantitative measure of the degree of stress provided by the scenario to the WAAS system as a function of location and time during the simulation.
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:	585 - 594
Cite this article:	Chavin, Steven, "Ionospheric Specification for the Wide Area Augmentation System (WAAS) Simulation Studies," 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. 585-594.
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