Ney, they work, but probably not with the Pk that the
manufacturer like to claim.
The radar in such systems does not sweep, it is usually an array of
emitters facing out in all directions to give no lag time in
detection. And in some systems the projectile fired is from fixed
launchers mounted on various arcs of the AFV, so there is literally
very little mechnical reaction time.
But as I said, the claims of high Pk is probably suspicious, like
one which claimed 100 percent against everything even APFSDS.
