Srinivas
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Agreed detection is possible but what about the reaction time...Missile shields are designed to intercept MIRV's that fly well above 100 km and then separate multiple war heads upon re-entry. This gives enough time for the defence shield to adequately select the targets for interception. Please remember, you’re trying to catch a good-sized rocket headed for Low Earth Orbit within 60-300 seconds. The re-entry phase is a poor option because the missile is already on-target — blowing up a nuclear or chemical rocket might just drop the warhead slightly outside of town as opposed to on the city center.
Each ICBM contains a bunch of Multiple Independently targetable Reentry Vehicles, some containing genuine warheads, some dummies to confuse defense systems.
This means the closer the target area the lower chance of interception.
View attachment 371758
Yes the reaction time is low but because of the close proximity the detection can be quicker and similarly the launch of anti missile.
during the ascending phase into atmosphere, the missile path is predictable and can be shot down.