Okey, now it is the time for this ballistic Missile Range officer to tell you some.
In the case of Fire n Forget type true missiles, as is Brahmos, which has never disappointed in 31 times (it got) tested. You are not worried about the target health after the missile launch. It is understood, that the impact must have decimated its target. Because Brahmos is a bull's eye friendly missile.
In other cases, the simple google earth comes handy. You know the target, launch the missile, after its cruise of whatever minutes - just open the google earth and find the target, if its still in one piece!
Now thank me!