In the IMPROWE project (IMplementing Rnp Operations With Egnos) the Institute for Flight Guidance, in conjunction with air traffic control authorities Austro Control and LPS Slovakia, is concerned with researching satellite navigation based approaches on a calculated approach path with and without vertical guidance with the support of the European satellite augmentation system EGNOS.
The navigation service EGNOS (European Geostationery Navigation Overlay Service) is based on the combination of a satellite and a ground system which works with GPS but which provides more precise positioning data for Europe. EGNOS expands the existing military navigation system GPS for civil security-critical applications, primarily in aviation but also for rail transport and shipping.
In mountainous terrain or areas with poor GPS coverage, the number of acquirable satellites is limited. This means that the integrity, availability and continuity required for three-dimensional flight guidance is not assured. If the vertical guidance components of an instrument approach are lost, EGNOS can be used to improve performance and thus open the airport in bad weather.
Various services for instrument approach with defined decision heights
Further, with improved EGNOS algorithms it may be possible to reduce the decision height for an instrument approach to 60 m (200 feet) above ground level. This could lead to some current, ground-based landing systems being completely replaced and airport operators would no longer have to bear the costs for their maintenance. In IMPROWE, in collaboration with the partners, possible approach procedures are being designed and tested in test flights.
The project is funded by the EU Agency for the European Global Navigation Satellite System (GSA) which supports the EU Commission in the field of GNSS.