WAAS-Based Threat Monitoring for a Local Airport Monitor (LAM) that Supports Category I Precision Approach

Jason Rife, Sam Pullen, Todd Walter, Eric Phelts, Boris Pervan and Per Enge

Abstract:	The Federal Aviation Administration has sponsored the development of a Local Airport Monitor (LAM) prototype designed to enable GPS-based precisionapproach by leveraging the existing capabilities of the Wide Area Augmentation System (WAAS). The LAM transmits a lumped WAAS correction via a Local Area Augmentation System (LAAS) message. The broadcast error bounds for the LAM are stricter than those for WAAS in order to enable Category I Precision Approach with a 10 m Vertical Alert Limit (VAL). The LAM ensures integrity of these tightened error bounds by leveraging both local monitoring and WAAS monitoring. This paper describes the use of WAAS monitoring to protect LAM users from ionosphere, code-carrier divergence and signal deformation threats. Although the LAM rebroadcast slightly delays the arrival of WAAS alerts to users, monitor integrity can nonetheless be ensured by restricting the allowed design space for user receivers.
Published in:	Proceedings of IEEE/ION PLANS 2006 April 25 - 27, 2006 Loews Coronado Resort Hotel San Diego, CA
Pages:	468 - 482
Cite this article:	Rife, Jason, Pullen, Sam, Walter, Todd, Phelts, Eric, Pervan, Boris, Enge, Per, "WAAS-Based Threat Monitoring for a Local Airport Monitor (LAM) that Supports Category I Precision Approach," Proceedings of IEEE/ION PLANS 2006, San Diego, CA, April 2006, pp. 468-482. https://doi.org/10.1109/PLANS.2006.1650635
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