Analysis and Testing of GNSS Landing System Navigation Sensor Error Requirements

Gary A. McGraw, Jeffery A. Finley

Abstract:	Working Group 4A (WG4A) of RTCA Special Commit-tee 159 (SC–1 59) has recently proposed navigation sensor error (NSE) requirements for the FAA’s Local Area Augmentation System (LAAS), This paper analyzes these proposed NSE accuracy requirements in the context of the theoretical performance of a carrier-smoothed code Global Navigation Satellite System (GNSS) Landing System (GLS). Using realistic GLS NSE and dynamic tracking models, the LAAS vertical NSE requirements proposed by WG4A were tested in a simulation of an existing, certified, CAT–IIIB autoland system. It is demonstrated that ILS-equivalent performance can be achieved, thus providing a preliminary validation of the proposed LAAS vertical NSE requirements. However, it is also shown that if unrealistic “ILS look–alike” NSE spectral characteristics are applied to GLS, then it would be very difficult to meet the proposed NSE noise requirements with high availability, under the assump-tions of current specified Global Positioning System (GPS) signal levels and satellite geometry.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	1593 - 1602
Cite this article:	McGraw, Gary A., Finley, Jeffery A., "Analysis and Testing of GNSS Landing System Navigation Sensor Error Requirements," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 1593-1602.
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