Before the Revolution, the United States undertook three programs, to improve/upgrade the air-defence system of Iran. As well as air defence radars the network was linked using microwave LOS and troposcatter communications networks.
As of 1996, Iranian Air Defence forces included about 18,000 military personnel. The tradition of aircraft-based air defense, derived from the US-trained Air Force from before the 1979 Iranian Revolution, was giving way to an expanding arsenal of ground-based air defense missile systems. Still, Iran was at the time unable to construct a nationwide, integrated air defense network, and continued to rely on point defense of key locations with surface-to-air missile batteries.
In December 2005, Iran entered into a contract to purchase 29 TOR-M1 (SA-15 Gauntlet) mobile surface-to-air missile defense systems from Russia worth more than US$700 million (EUR 600 million). Between 1998 and 2002, Iran imported approximately 6 JY-14 surveillance radars from the China National Electronics Import-Export Corporation. The radar can detect targets up to 300 km away and is now part of Iran's air defense system.
On 1 September 2008, it was reported that Russia may proceed with plans to sell advanced S-300 air defence systems to Iran under a secret contract believed to have been signed in 2005. On 22 September 2010, Russian President Dmitry Medvedev signed a decree banning the sale of the S-300 and other military equipment to Iran. The sale was canceled because of United Nations Security Council Resolution 1929 sanctions on Iran. On 10 November 2010, Iran announced that it had developed a version of the S-300 missile. By the end of 2016 Russia had lifted the self-imposed ban on the sale and completed delivery of all missiles to Iran
Iranian land forces have a total of some 1,700 anti-aircraft guns including 14.5mm ZPU-2/-4, 23mm ZSU-23-4, 23mm ZU-23s, 37mm Type 55s, 57mm ZSU-57-2 and 100mm KS-19s. Iran also had 100-180 Bofors L/70 40mm guns and modest numbers of Skygaurd 35mm twin anti-aircraft guns. Its largest holding consisted of ZU-23s(which it can manufacture).
Recently Iran has built several new anti-aircraft guns including Samavat 35mm Anti-Aircraft Guns, Sa'ir 100mm Anti-Aircraft Guns (Upgraded automatic version of KS-19) and the Mesbah 1 air defense system.
On 21 August 2012, the Iranian military started construction of its largest air defense base in the city of Abadeh in the Southern Fars Province. The air defense base is due to be built at the cost of $300 million and will have 6,000 personnel available for a large array of duties, including educational ones.Days later, the defense ministry also announced plans to develop Bavar 373, a new long-range air-defense system, by March 21, 2013.
LITS OF IRAN AIR DEFENSE SYSTEM IN THIS VIDEO
ZU-23-2 Anti-air Artillery, Towed and Self-Propelled
Sa'ir 100mm Anti-Aircraft Guns
ZSU-23-4 Self-Propelled anti-Aircraft System Weapon
ZSU-57-2 Self-Propelled anti-Aircraft System Weapon
MIM-23 Hawk Medium Range Surface-to-Air Missile
Sayyad-1 Long Range Surface-to-Air Missile
S-200 Fajr-8 and S-200 Ghareh Long Range Strategic Surface-to-Air Missile
SA-6 Gainful Missile Medium Range Surface-to-Air Missile System
Rapier Missile Short Range Surface-to-Air Missile
Tor Missile System Point Defense Multirole Surface-to-Air Missile
S-300 missile system System Long Range Strategic Surface-to-Air Missile System
Bavar-373 Missile System Advanced Long Range Surface-to-Air Missile System
S-300PMU2 System Long Range Strategic Surface-to-Air Missile System
Mersad Medium Range Air Defense System
Raad-1,2 & Khordad-3 Medium Range Advanced Air Defense System