The unveiling comes at a time of rising tensions with the United States, which have escalated ever since US President Donald Trump withdrew from a 2015 nuclear deal with Iran and reimposed sanctions.
"This radar is capable of identifying and finding all types of cruise missiles, stealth aircraft, drone systems and also ballistic missiles within a 400-kilometre range," ISNA quoted army air defence force chief Brigadier General Alireza Sabahi-Fard as saying during the unveiling ceremony.
The Falagh was also capable of connecting to the Islamic republic's air defence network and completing the coverage of the S-300 missile system it acquired from Russia, the news agency said.
Iran installed the S-300 system in March 2016 following several years of delay after a nuclear agreement reached with world powers allowed the lifting of international sanctions.
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