Aviation Applications for Galileo

A. Schuster Bruce, R. Jeans, E. Chatre, G. Alcouffe

Abstract:	Eurocae WG62 was created in January 2002 to deal with standardisation of Galileo user equipment and to be a forum to discuss and make recommendations to the Galileo system designers on issues of concern to civil aviation. Obviously the primary focus of WG62 is the eventual generation of a MOPS specification for the airborne Galileo or Galileo/GPS/SBAS equipment. A list of working assumptions for the operational concept for the use of Galileo by aviation has been produced - this is the heart of this paper. In addition a number of key system issues have been analysed - these are defining the interference environment and hence interference requirements in the E5/L5 band, the definition of how different integrity concepts are used for Galileo, and how the different signals/frequencies from different constellations of satellites are combined and used in the receiver, including their use in degraded modes. The key benefit to aviation of Galileo is the provision of a level of redundancy in constellations, frequencies and satellites with respect to GPS. The sum of all these redundancies may eventually allow sole means satellite navigation for aviation. In addition, Galileo on its own will provide a worldwide APV-II service which will mainly benefit general aviation and public transport operations into secondary airports worldwide, and should lead to significant improvements in air safety particularly in the developing world. Other benefits include the earlier availability of Galileo dual frequency signals compared to GPS L5, the higher performance of the Galileo L1 signal compared to GPS L1, and a robust route to Cat III GBAS. It has been identified that there are numerous technical and operational benefits to be obtained from the combination of GPS and GALILEO, potentially also with augmentation. These benefits are available incrementally to users at different times given different locations and availability of core constellations and augmentation systems. It is expected that the baseline receiver architecture will be dual constellation and multiple frequency. The proposed concept of operations covers all phases of flight and the following GNSS elements: GALILEO, GPS, SBAS, ABAS and GBAS. Based on the GNSS elements, possible airborne architectures and operational/functional/augmentation classes, it is possible to define a subset of likely combinations for standardisation including degraded modes. GBAS operations with Galileo will be similar to current GBAS concepts and hence be ILS look alike where possible. The selection of constellations and frequencies should be transparent to the pilot for all phases of flight and hence no annunciation or control input is needed - databases could be used to aid automatic selection.
Published in:	Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003) September 9 - 12, 2003 Oregon Convention Center Portland, OR
Pages:	849 - 856
Cite this article:	Bruce, A. Schuster, Jeans, R., Chatre, E., Alcouffe, G., "Aviation Applications for Galileo," Proceedings of the 16th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS/GNSS 2003), Portland, OR, September 2003, pp. 849-856.
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