• SJU reference # PJ.14-03-01 /Release 2019
  • Stakeholders
  • Benefits Cost-efficiency
  • Status In the pipeline

GBAS uses local augmentation to support precision approach operations for aircraft equipped with satellite navigation. The technology is used today in Category I precision approaches down to 200 ft decision height. In comparison to instrument landing systems (ILS), GBAS allows more flexible procedure design with less infrastructure. Additionally, GBAS can provide resilience in low visibility conditions (no significant impact in icy and snowy conditions), shorter routes, fuel-saving approaches, and precision approach on runways where ILS is not feasible.

Building on the SESAR 1 solution, this candidate solution addresses the development of GBAS CAT II/III based on multi-constellation and dual-frequency satellite services, including Galileo. This improves performance, especially where the impact of ionospheric gradients can be effectively reduced. The research extends to civil-military interoperability where use of MC/DF GBAS solutions by State aircraft and evaluation of potential technical interoperability between military differential GNSS and GBAS are assessed. Also, non-MMR avionics architecture design for regional and business aircraft targeting CATII/III operations supported by xLS guidance is studied.

Further research includes enhancements to the first generation CAT II/ III GBAS to cope with adverse ionospheric conditions outside mid latitudes, thus enabling a globally deployable GAST D solution. Research is also focusing on devising GBAS ground station status data provision and developing cost efficient infrastructure for operations and maintenance on complex airports. Also, the new ICAO GBAS service volume definition that decouples the maximum use distance from approach service volume will be assessed from a ground-segment technical perspective.

SJU references: #PJ.14-03-01/Wave 2


  • Improved resilience by limiting the capacity reduction in degraded situations and by avoiding critical and sensitive areas
  • No significant performance reduction and special maintenance during snow and ice conditions
  • Reduced installation and maintenance costs compared to ILS
  • Greater frequency efficiency in the VHF navigation band
  • Improved environmental impact by approaching aircraft due to shorter routes and noise abatement