DESCRIPTION AND ASSESSMENT OF REAL-TIME ALGORITHMS TO ESTIMATE THE IONOSPHERIC ERROR BOUNDS FOR WAAS

Robert S.Conker, M. Bakry El-Arini, Thomas W. Albertson, John A. Klobuchar, and Patricia H. Doherty

Peer Reviewed

Abstract:	The Federal Aviation Administration (FAA) is developing a Wide-Area Augmentation System (WAAS) to augment GPS for use during en route through Category Z (CAT I) precision approach flight operations. WAAS has three components: (1) extra ranging sources using geostationary earth orbiting (GEO) communications satellites; (2) a vector of corrections to the GPS signal-in- space, including components for ionospheric delay estimations and clock and ephemeris errors; and (3) integrity monitoring to alert users of out-of-tolerance conditions. This paper describes real-time ionospheric algorithms that are part of the accuracy and integrity monitoring functions. A performance assessment is made with respect to the requirements specified in the WAAS procurement.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 44, Number 1
Pages:	77 - 88
Cite this article:	S.Conker, Robert, El-Arini, M. Bakry, Albertson, Thomas W., Klobuchar, John A., Doherty, Patricia H., "DESCRIPTION AND ASSESSMENT OF REAL-TIME ALGORITHMS TO ESTIMATE THE IONOSPHERIC ERROR BOUNDS FOR WAAS", NAVIGATION: Journal of The Institute of Navigation, Vol. 44, No. 1, Spring 1997, pp. 77-88.
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