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  (10 - 20 of 102)
t95blackeagle Jun 16 2012, 9:18pm says:

watch my sam-6 model i hope you guys like it

+7 votes     reply to comment
phoenix8 Jun 15 2012, 7:17am says:

Nice video. :)

+6 votes     reply to comment
FatherTime87 Jun 13 2012, 12:20pm says:

lol thats to funny

+3 votes     reply to comment
Resistant94 Mar 9 2012, 1:41pm says:

AA lovers google (Ghadeer Anti-Air system)
this system made in islamic republic of iran
Nice piece of art

+4 votes     reply to comment
Kastrenzo Feb 5 2012, 7:17am says:

AA is nerfed in Battlefield 3, all the more reason to hate Jet pilots,

They don't do anything productive, they just fly around and try to shoot down other jets, or occasionally do a strafing run and manage to hit absolutley nothing.

+3 votes     reply to comment
aj8898 Jul 15 2013, 1:50pm replied:

YES! I agree 100%! Now we need bombs with Frostbite 3...

+2 votes     reply to comment
The-Kommandant Jan 19 2012, 3:50am says:

I love things that fly. . but I like them more being blown up ;)

+6 votes     reply to comment
aj8898 Feb 19 2013, 7:02pm replied:

Especially planes!

+2 votes     reply to comment
jenkins64 Jan 2 2012, 5:49pm says:

23 ItK 95, 23 ItK 61 & 88 ItK 35 Being fired live by FDF, check it out!

+3 votes     reply to comment
Black@Knight Dec 8 2011, 5:28pm says:

I'm really love AA guns specially armored vehicle with rockets like Sam rockets ;)

+2 votes     reply to comment
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