Development of an Error Model for Locally-Achieved Performance of WAAS

R. Niles, and C.A. Shively

Abstract:	This paper describes the development of a model to characterize errors resulting from application of Wide Area Augmentation System (WAAS) differential corrections at a particular location. This model is intended to apply only when the ionosphere is in a 'quiet' (undisturbed) state. In developing this model the standard deviation of the total error was derived from measurements and also synthesized from error components. The component standard deviations were either also derived from measurements (where possible) or modeled in such a manner as to make the total standard deviation from combining the components match the total standard deviation from measurements. In so doing it was found that the error characteristics from the new model were much smaller than those derived from integrity parameters broadcast by WAAS. It is widely believed that WAAS accuracy at a particular location is significantly better than indicated by WAAS itself. However, more data should be processed in a similar fashion to confirm that this new model is not too optimistic for some error components, particularly the tropospheric delay.
Published in:	Proceedings of the 2006 National Technical Meeting of The Institute of Navigation January 18 - 20, 2006 Hyatt Regency Hotel Monterey, CA
Pages:	342 - 357
Cite this article:	Niles, R., Shively, C.A., "Development of an Error Model for Locally-Achieved Performance of WAAS," Proceedings of the 2006 National Technical Meeting of The Institute of Navigation, Monterey, CA, January 2006, pp. 342-357.
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