Resilience–broadly, the ability to readily recover from external disturbances–seems likely to become the next buzzword in aviation’s lexicon. It is gaining acceptance primarily to describe a future world air navigation system’s resistance to interruptions and outright signal loss, to provide pilots with essential, unfailing position, navigation and timing (PNT) data. Resilience came to the fore at a February conference on GNSS vulnerability, sponsored by the UK Institute of Navigation.
Airbus plans to install satellite-based augmentation systems (SBAS) in its A350XWB to support GPS Cat 1-equivalent 200-foot LPV approaches. SBAS includes the FAA’s WAAS; Europe’s Egnos (2010); India’s Gagan (2011); and Japan’s MSAS (2010/11). The FAA has already published 1,445 WAAS LPV approaches (exceeding the number of ILS approaches) and plans to have 6,000 available by 2018.