The local-area augmentation system (LAAS) is an all-weather aircraft landing system based on real-time differential correction of the GPS signal. Local reference receivers located around the airport send data to a central location at the airport. This data is used to formulate a correction message, which is then transmitted to users via a VHF Data Link. A receiver on an aircraft uses this information to correct GPS signals, which then provides a standard instrument landing system (ILS)-style display to use while flying a precision approach. The FAA has stopped using the term LAAS and has transitioned to the International Civil Aviation Organization (ICAO) terminology of ground-based augmentation system (GBAS).[1] While the FAA has indefinitely delayed plans for federal GBAS acquisition, the system can be purchased by airports and installed as a Non-Federal navigation aid.[2]
- ^ "GNSS Frequently Asked Questions – GBAS". www.faa.gov. Retrieved May 19, 2016.
- ^ "Satellite Navigation – Ground Based Augmentation System (GBAS)". www.faa.gov. Archived from the original on May 22, 2016. Retrieved May 19, 2016.