Potential performance levels of a combined Galileo/GPS navigation system

This paper presents the results of a research project that investigated the potential benefits of a combined Galileo/GPS navigation system. The resear ch addressed in detail the two key required navigation performance (RNP) pa rameters of accuracy and integrity. The project was supported by Alcatel Sp ace and was a contribution to the Galileo definition studies (supported by the European Community under the GALA project). The results show significan t improvements in both accuracy and integrity (achievable through RAIM) whe n a combined constellation is used rather than Galileo alone.