Unique Algorithm for Combining Measurements from Various Sensors to Improve Accuracy and Continuity of WAA Sand LAAS

John W. Diesel, Rodney W. Benoist

Abstract:	WAAS will have a vertical accuracy of 7.6 meters, 95%, which is inadequate for CAT 1. The new algorithm improves WAAS accuracy to 1.5 meters, 95%, with 5 meters vertical alert limit, which is adequate for CAT 11. It improves LAAS Type 1 accuracy from CAT I with 99.9% availability to CAT III with 99.999% availability. If the signal in space is interrupted, it permits coasting for 5 minutes for CAT 1, 2 minutes for CAT H, and 1 minute for CAT III. The algorithm uses measurements from dissimilar equipment already on commercial airliners, and to eventually be on alI GA aircraft. R requires no additional ground facilities.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	1365 - 1374
Cite this article:	Diesel, John W., Benoist, Rodney W., "Unique Algorithm for Combining Measurements from Various Sensors to Improve Accuracy and Continuity of WAA Sand LAAS," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 1365-1374.
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