The GBAS will likely replace SBAS, by the time you build enough ground stations for the SBAS, and the data centers, and sats, you might just as well install a GBAS.
With CAT III cert, and the curved path GBAS signal, it will be a tough system to beat.
There is also some traction in using the cell towers to broadcast as well.
IRU's are about to take a quantum leap forward as well, when coupled with the intent bus, you have a real nice system.
Last edited by FlightPathOBN; 23rd Jun 2012 at 18:42.