Final Presentation Category III GBAS with evolution towards DFC

Last Updated: 15/10/2025 13:08     Created at: 15/10/2025 13:01

On October 8, 2025, Indra Navia and partners presented the results of the NAVISP EL2-100 activity “Advanced GBAS Performance for CAT II/III Precision Approaches”.

The project focused on enhancing Ground-Based Augmentation System (GBAS) capabilities to support Category II and III precision approaches, which require extremely high integrity, accuracy, and availability. The team investigated advanced techniques to meet ICAO GAST-D+ and GAST-E performance specifications.

The system was designed, simulated, and validated through rigorous testing and analysis, including:

Development of advanced threat models and mitigation strategies

Evaluation of signal integrity and continuity under challenging conditions

Simulation of CAT II/III approach scenarios with real-world constraints

Assessment of system performance against ICAO standards

Key results include:

• Feasibility of GBAS for CAT III Decision Heights (DH) down to 50 ft
• Integrity risk levels below 1×10⁻⁸, meeting stringent aviation safety requirements
• Enhanced robustness against ionospheric anomalies and multipath effects
• Clear roadmap for future certification and deployment in operational environments

The project was co-funded by NAVISP Element 2, which supports the competitiveness of PNT technologies in partnership with European industry. The slides of the final presentation can be found here.