Microburst,Denti,
GPS remains easy to jam, and neither form of augmentation can overcome that. Several trials have proved the susceptability to jamming. There is nogood in having a corrective signal if the basic one is non-existant.One possible solution might be to have a receiver antenna that cuts-off just above the horizontal, because terrorist jamming is likely to be from the ground.Trouble is that you have aircraft rolling and pitching in TMA
Keith