On Monday, October 18, 2021, Indra Navia AS presented the results of the project “GBAS DEVELOPMENT AND VERIFICATION”, which were achieved through the support of the NAVISP program. More than 60 people from industry and research attended the final presentation, which shows the great public interest in the project.

Indra Norway, also known as Indra Navia AS, is a wholly owned subsidiary of Indra, one of the world's leading technology and consulting companies in the transport and defence sectors. From Asker in Norway, the company delivers safety critical air-traffic management solutions to 1400 airports in more than 120 countries.

Since 2010, Indra Navia AS, as one of only a few European companies, has been developing the Ground Based Augmentation System (GBAS) Approach Service Type D ("GAST D" in short) ground station technology. This involves the creation of new standards in the field of landing systems, based on satellite technologies, complementary to Satellite Based Augmentation Systems (SBAS).

GBAS measures the accuracy of the received GNSS signals and transmits the satellite corrections, integrity data and approach patterns to the respective aircraft. This allows for improved navigation system performance in the areas of integrity, continuity, availability, and accuracy. So far, this and similar technologies has been used mainly in good weather conditions. However, with the support of NAVISP, Indra Navia AS has developed an operational concept for GBAS GAST D that improves the runway capacity even in low to zero visibility. The term GAST D is used here to refer to landing operations in lower visibility conditions including ICAO Category III operations.

In the Q&A session at the end of the presentation, Indra Navia AS emphasized the importance of using dual-frequency receivers in the future, as they offer more flexibility in installation. However, no certified receivers are currently available being this an area of further work. In the long term, GBAS will complement or even replace the mostly used ILS and provide more robust and accurate information to help aircrafts land safely. By using GBAS GAST D, it will be possible to coordinate air traffic in a more efficient, safer and reliable way even in poor weather conditions, which will not only lead to a general satisfaction of customer needs but also to a reduction of CO2 emissions.

The slides of the final presentation can be downloaded here.