Description of an Ionospheric Spatial Gradient Irregularity Detector for WAAS

M. Bakry El-Arini and Roland O. Lejeune

Abstract:	In the Wide Area Augmentation System (WAAS), one of the functions is the generation of the ionospheric delay estimates and an estimate of the post correction error bounds. However, ensuring with a high degree of confidence that the post-correction error bounds meet their integrity requirement has proven to be more difficult than anticipated. The difficulty stems mostly from the wide range of ionospheric conditions that the system may face over its lifetime. Given that the conditions that would challenge the system the most (severe geomagnetic storms) are relatively rare, system designers have moved toward an initial design constraining the availability of the service to non-severe ionospheric conditions. To that end, the design has been augmented with ionospheric irregularity detectors. Various types of ionospheric irregularity detectors have been examined. Among these are spatial gradient, temporal gradient, and Chi-square detectors. This paper discusses the initial design and the performance of a spatial gradient irregularity detector.
Published in:	Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000) September 19 - 22, 2000 Salt Palace Convention Center Salt Lake City, UT
Pages:	294 - 300
Cite this article:	El-Arini, M. Bakry, Lejeune, Roland O., "Description of an Ionospheric Spatial Gradient Irregularity Detector for WAAS," Proceedings of the 13th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2000), Salt Lake City, UT, September 2000, pp. 294-300.
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