Air defence is defined by NATO as "all measures designed to nullify or reduce the effectiveness of hostile air action."[1] They include ground-and air-based weapon systems, associated sensor systems, command and control arrangements and passive measures (e.g. barrage balloons). It may be used to protect naval, ground, and air forces in any location. However, for most countries the main effort has tended to be 'homeland defence'. NATO refers to airborne air defence as counter-air and naval air defence as anti-aircraft warfare. Missile defence is an extension of air defence as are initiatives to adapt air defence to the task of intercepting any projectile in flight.

In some countries, such as Britain and Germany during the Second World War, the Soviet Union and NATO's Allied Command Europe, ground based air defence and air defence aircraft have been under integrated command and control. However, while overall air defence may be for homeland defence including military facilities, forces in the field, wherever they are, invariably deploy their own air defence capability if there is an air threat. A surface-based air defence capability can also be deployed offensively to deny the use of airspace to an opponent.

Until the 1950s, guns firing ballistic munitions ranging from 20 mm to 150 mm were the standard weapon; guided missiles then became dominant, except at the very shortest ranges.

The essence of air defence is to detect hostile aircraft and destroy them. The critical issue is to hit a target moving in three-dimensional space; an attack must not only match these three coordinates, but must do so at the time the target is at that position. This means that projectiles either have to be guided to hit the target, or aimed at the predicted position of the target at the time the projectile reaches it, taking into account speed and direction of both the target and the projectile.
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Post comment Comments  (90 - 100 of 107)
FelipeFR Feb 13 2010, 9:01pm says:

It is interesting. Many people on this group are both in Aircraft Lovers and Anti-Aircraft Lovers groups...

+2 votes     reply to comment
The_Chemical_Brother Feb 20 2010, 4:08pm replied:

they like both

What goes up must come down xP

+6 votes     reply to comment
Vader91 Feb 13 2010, 8:21pm says:

I might just join this group since I'm sick of the air jockeys next door rattlin' my windows! (I live about 6 feet from Nellis Air Force Base, where the Thunderbirds nest)

+1 vote     reply to comment
FelipeFR Feb 9 2010, 12:19pm says:


+1 vote     reply to comment
☦BalkanB☢y☦ Jan 31 2010, 12:25pm says:

By the way I forgot to say, pls set me as SA-3 operator :)

+2 votes     reply to comment
█Black/Brunez█ Jan 31 2010, 12:20pm says:

... New guy here =D

+1 vote     reply to comment
☦BalkanB☢y☦ Jan 31 2010, 12:10pm says:

me too, BRING THEM DOWN,muahaha! xD

+2 votes     reply to comment
Panzert Jan 31 2010, 12:55am says:

I love aircraft, but i also hate them. Depending on what they are.

+2 votes     reply to comment
raumboo-not-english Jan 27 2010, 10:52am says:

please more pictures and videos please
i leave this group if nothing happens!
(just kidding!!)

+1 vote     reply to comment
ℱℓσℊℊℯɾ✈ Creator
ℱℓσℊℊℯɾ✈ Jan 27 2010, 4:52pm replied:

if u leave u will become a TRAITOR and starting from friday there should be some new members

+2 votes   reply to comment
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Jan 22, 2010
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