question about SM-2's track model

i’ve been being interesting in the aegis system these days. as we know, the SM-2 missile’s track model is INS/orders track at begining and semi-active radar track at the end. AN/SPY-1 PAR could offer orders to SM-2 to correct the lane error. but it can’t offer the final illuminating because it’s a S wave band radar which doesn’t have enough accuracy. the final illuminater are three AN/SPG-62 fire control radars. they have to illuminate for SM-2 while the missiles are in the end of their trip.

my question is how could aegis deal with targets which are under horizon. how could the AN/SPG-62 FCS illuminate the targets since they are in its dead angle. aegis could be supported by other sensor units such as AWACS through data links, but still, AN/SPG-62 must offer illuminating. unless AWACS can do this job for FCS, otherwise i’m confused.