Application of Satellite Based Augmentation Systems to altitude separation

This paper presents the application of GNSS1, or more precisely of Satellit e Based Augmentation Systems (SBAS), to vertical separation for en-route, a pproach and landing operations. Potential improvements in terms of operatio nal benefit and of safety are described for two main applications. First, v ertical separation between en-route aircraft, which requires a system avail able across wide areas. SEAS (EGNOS, WAAS, and MSAS) are very well suited f or this purpose before GNSS2 becomes available. And secondly, vertical sepa ration from the ground during approach and landing, for which preliminary d esign principles of instrument approach procedures and safety issues are pr esented. Approach and landing phases are the subject of discussions within ICAO GNSS-P. En-route phases have been listed as GNSS-P future work and by RTCA for development of new equipments.