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.
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