Iranian science just like their military indusrty is largely working for PR. For example everyone is talking about stealth fighters. So Iran release their own stealth: 1960-s F-5 with twin tails they also also show a cool plastic model and wonder stealth flying boats. Everyone talks about armed UAV's so they make Karar - some WW2 V2 style rocket with dumb bomb atached to it. S-300 is another hot stuff in news, so they welded together 55 gal drums and show it on parade. Then they show a modified S-200 and claim its just like S-300. Time to time they release more wonder weapons: stealth sumbarine, missile torpedo, super howitzer, flying saucer, mega flack canon and so on...
Of course they have sone real achievements too. Compare to Arab countries their science is well. But overall more PR than the real thing. Iranian claims should be divided by 10.