• SJU reference # PJ.14-W2-79a /Release 10
  • Stakeholders
  • Benefits Cost-efficiency
    Operational efficiency
  • Status In the pipeline


This Solution was formerly part of PJ.14-03-01-W1

GBAS uses local augmented satellite signals to support precision approach operations for aircraft equipped with satellite navigation. The technology is used today in CAT 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, shorter routes, fuel-saving approaches, and precision approach on runways where ILS is not feasible.

SESAR 2020 aims to enhance the first generation CAT II/III GBAS to cope with adverse ionospheric conditions outside mid latitudes, thus enabling a globally deployable GAST D solution in more challenging environments including equatorial and Nordic regions. Technical problems are studied, such as multipath from obstacles and radio frequency interference at large and complex airports.

This candidate solution addresses cost-efficient infrastructure for operation and maintenance of GBAS in complex airport environments. Among other, verifying VHF ground-air data broadcast (VDB) coverage can be challenging. In wave 1, SESAR 1 VDB measurement equipment was enhanced and a runway coverage simulation tool developed as means to verify that the VDB field coverage conforms with applicable ICAO Annex 10 Vol. I requirements. In wave 2, a horizontally polarised VDB measurement antenna to be located on the roof of a van is developed and used together with the VDB measurement equipment to technically verify ICAO Doc 8071 Vol. II ±3 dB measurement uncertainty requirement. The work is expected to advance standardisation activities with the existing working groups at European and ICAO level.


Improved resilience by limiting the capacity reduction in degraded situations
Reduced installation and maintenance costs compared to ILS
Maintained levels of safety
Greater frequency efficiency
Improved environmental impact due to shorter routes and noise abatement