The Ground Based Augmentation System (GBAS) is a landing system for aircraft. It is based on a reference station at the airport providing corrections and integrity information for satellite navigation signals. Several of these stations are already installed and in operation at airports throughout the world (including the airports in Frankfurt, Zurich, Sydney and Newark, for example), regularly providing precision approach guidance up to CAT-I weather conditions (i.e. with a certain minimum visibility). Current operational systems only provide corrections and integrity parameters for GPS constellations and navigation signals on one frequency.
The GBAS Guided Precision Departures (GUIDE) project includes the study of development towards a dual-frequency multi-constellation system and its use for guided precision departures. The use of new satellite navigation signals (e.g. from the European Galileo constellation) makes GBAS significantly more robust against external disturbances caused by ionospheric or tropospheric effects that regularly occur in equatorial regions. This makes it is possible to develop and standardize a system which can be used around the world.
On the operational side, procedures are being developed to guide aircraft along predefined departure routes. They could be transmitted by the GBAS in a similar way to that in which it currently broadcasts approach tracks. A number of operational restrictions could thus be lifted in order to increase the capacity of a departure runway and limit delays while maintaining the very high level of safety.
Using one single means of navigation for approach guidance, departure guidance and, possibly also for ground guidance, has the potential to minimize the effort required for standardization, integration and certification. At the same time this technology enables advanced arrival and departure routes that can significantly reduce noise and fuel consumption.
DLR Institute of Communications and Navigation (Coordinator)
DLR Institute of Flight Guidance
DLR Institute of Flight Systems
DLR Flight Experiments