Navigation Services
Local Area Augmentation System The Local Area Augmentation System (LAAS) is a ground-based augmentation to GPS that focuses its service on the airport area (approximately a 20-30 mile radius) for precision approach, departure procedures and terminal area operations. It broadcasts its correction message via a very high frequency (VHF) radio data link from a ground-based transmitter. LAAS will yield the extremely high accuracy, availability, and integrity necessary for Category I, II, and III precision approaches, and will provide the ability for flexible, curved approach paths. LAAS demonstrated accuracy is less than 1 meter in both the horizontal and vertical axis. LAAS is currently a Research and Development (R&D) project focusing on the resolution of outstanding integrity and safety issues to reduce risk for future development. The FAA Ground-Based Augmentation System (GBAS) office is currently working with industry in anticipation of the certification of the first prototype LAAS ground station in Memphis, TN. This project, being performed under contract with Honeywell and in coordination with the GBAS team, other FAA organizations, as well as Federal Express (FedEx), Boeing, Rockwell-Collins, and the Memphis Shelby County Airport Authority, integrates FedEx-leased Honeywell LAAS equipment and performs a series of hardware, software, and siting upgrades. The team is working to use the Memphis site to prove operational concepts and to obtain the first Non-Federal U.S. approval for LAAS Category I operations. The FAA is also working with other service providers to facilitate development of an International Civil Aviation Organization (ICAO) Standards and Recommended Practices (SARPs) compliant Category I LAAS, based on the Memphis prototype. Additionally, the FAA is working towards international GBAS implementation and interoperability by sharing technical know-how and approval processes with countries around the world. Airservices Australia, Brazil, DFS Germany, and AENA Spain have been actively supporting the implementation of GBAS. All four countries have installed prototype GBAS systems and are involved in technical and operational evaluation activities. These nations are developing their own processes but are still aiming to be in compliance with FAA approval practices. Common understanding and practice of system approval, and the use of common test cases and tools will be valuable in the implementation of GBAS around the world. |
