What is a ballistic missile - and will it stop a missile from North Korea?

North Korea’s test this week of an intercontinental ballistic missile has reignited interest and debate on the feasibility of ballistic missile defence systems, and whether countries such as Australia should seek to acquire them.

But what are these systems, and how do they work? How effective would they be in providing a defence against a potential missile attack?

How do they work?

All ballistic missile defence systems consist of a network of tracking and guidance radars, and the interceptor launchers.

On detecting a ballistic missile launch, the radars track the missile’s trajectory, fire an interceptor to shoot it down, and prepare further interceptors to be launched if the first one misses.

This is referred to as a “shoot-look-shoot” strategy, as opposed to a strategy of saturation – where the defender simply shoots as many interceptors as possible in the hope of achieving a kill.

Modern defence systems use interceptor missiles carrying kinetic kill vehicles. These are warheads that are non-explosive and designed to destroy incoming ballistic missiles by simply crashing into them.

All of the systems mentioned below are intended to work in conjunction with one another. They are integrated to provide the ability to shoot down ballistic missiles throughout their flight path. However, they are also capable of operating independently, although with less effectiveness than if operated in conjunction with other systems.
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