ROBUST DETECTION OF IONOSPHERIC IRREGULARITIES

Todd Walter, Andrew Hansen, Juan Blanch, Per Enge, Tony Mannucci, Xiaoqing Pi, Larry Sparks, Byron Iijima, Bakry El-Arini, Roland Lejeune, Mine Hagen, Eric Altshuler, Rob Fries, and Aleck Chu

Peer Reviewed

Abstract:	The Wide Area Augmentation System (WAAS) will provide real-time differential GPS corrections and integrity information for aircraft navigation use. The most stringent application of this system will be precision approach, which requires the use of differential ionospheric corrections. WAAS must incorporate information from reference stations to create an ionospheric correction map. More important, this map must contain confidence bounds describing the integrity of the corrections. The difficulty in generating these corrections is that the reference station measurements are not collocated with the aviation user measurements. This is not a problem for an undisturbed ionosphere over the conterminous United States (CONUS), as the ionosphere is nominally smoothly varying. However, a concern is that irregularities in the ionosphere will decrease the correlation between the ionosphere observed by the reference stations and that seen by the user. It is essential to detect when such irregularities may be present and increase the confidence bounds.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 48, Number 2
Pages:	89 - 100
Cite this article:	Walter, Todd, Hansen, Andrew, Blanch, Juan, Enge, Per, Mannucci, Tony, Pi, Xiaoqing, Sparks, Larry, Iijima, Byron, El-Arini, Bakry, Lejeune, Roland, Hagen, Mine, Altshuler, Eric, Fries, Rob, Chu, Aleck, "ROBUST DETECTION OF IONOSPHERIC IRREGULARITIES", NAVIGATION: Journal of The Institute of Navigation, Vol. 48, No. 2, Summer 2001, pp. 89-100.
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