Local Area Augmentation System
|Term||Local Area Augmentation System|
an augmentation to GPS that focuses its service on the airport area (approximately a 20-30 mile radius).
FAA (2009) homepage, Navigation Services, URL: http://www.faa.gov/about/office_org/headquarters_offices/ato/service_units/techops/navservices/gnss/hill/index.cfm#waas
Systems such as LAAS are known as ground-based augmentation systems (GBAS). LAAS 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 more flexible, curved approach paths. LAAS demonstrated accuracy is less than 1 meter in both the horizontal and vertical axis.