The Damavand with the Asr radar could track 100 targets, old Jamaran at least 30.
Its a computing issue.
But none of these, basically only very advanced PESA or AESA can continuously track a target.
The new radar can track a target with lets say 100 milliseconds update rate while the Asr and Jamran had a update rate of say 10 seconds.
The main array of the eagle eye will track hundrets of targets with a update rate of say 4 seconds.
So only approaching AshMs that need to be attacked and an aircraft that is about to being hit 5 seconds before impact.
I hope it is now understandable what I mean.
Now let me add something on the potential future destroyer:
With the eagle eye AESA and considering the rather small size of the Iranian ship I would recommend the Sayyad-3 as naval SAM.
I'm not a fan of the current large western destroyer trend and want Iran to go for smaller but well armed and automated ships of around 3000 tons max.
One front VLS with 32 120km range Sayyad-3 where the hull permits a VLS. Plus 2 x 3 70km Sayyad-3 horizontal stored quad launchers on decks where no depth for a VLS is available/economic.
32 Sayyad-3 + 24 Sayyad-2 plus 3 Kamad and 1 76mm CIWS.
That would be better supported by the current array size Cheshme Oghab "fire control" AESA.
The Bavar-373 is much larger, heavier and more expensive.
120km of the Sayyad-3 would be sufficient areal defense capability for a 3000t ship.
At the end of the day ships don't come with a single radar systems and an AESA like the Eagle Eye is likely just a single radar in a network of radars meant to give more accurate and faster targeting capability and faster data when tracking!
Clearly if you can target 12 then with a proper programing you can track far more especial with the high speeds of even S banded electronically scanned array's (IF you have the programing down but that is also something Iran can continue to upgrade in time if the proper hardware is already in place.)
Also at those speeds you don't need live tracking of each target because with the proper programing once the location is detected by your frequency beam's it gets stored in the computer with the potential distance it can travel in a fixed amount of time and you come back to it to keep tracking hell with the proper programing even for targeting you don't need to continuously stay fixed on it and at best you shorten the time set for targeting
So with Electronically scanned array's what's important is that you put in the right hardware at the start so future software upgrades and upgrades in for example data processing will allow you to enhance the capability of your radar without changing hardware
And an electronically scanned S band in terms of bandwidth is fast enough that future software upgrades to have great effect in enhance your targeting and tracking capability
Iran's Navy has done a great job especially with the budget given to them and unlike IRIAF they didn't sit around waiting for someone to hand them stuff and they didn't stay fixated on overhaul or simply a handful of projects.
They worked on Anti Ship missiles, Torpedo's, Mines, Frigates, FAC, Hovercrafts, submarines, New infrastructure including new R&D sites and test sites, New research vessels, various support vessels, New Radars, engines,..... They started out with reverse engineering and upgrading the most capable working ship they had at their disposal and are now moving on towards designing and developing platforms more capable than anything the country has ever had in it's fleet and they've built weapons that are more advanced than anything we have ever had.....
While the IRIAF hasn't even bothered to reverse engineer the F-14 let alone design an Iranian platform superior to it's F-4's nor have they even attempted to reverse engineer their C-130's and the fact that even the MOST advanced UAV's and UCAV's in Iran's fleet are IRGC UAV's and UCAV's says it all and to me it shows that this neither about technology or funding and sadly since the death of Shahid Sattari Iran's Air Force has had the wrong mentality and has been stuck on the weakest combat engine and platforms it's had since the mid 90's and by comparison to the Navy it would be like the Navy getting stuck it's FAC since the 90's and the fact that Iran's Air Defense Unites only blossomed after separating from the Air Force is yet another indication
What Iran's Air Force should be doing today should of been more along the lines of building a large fleet of large UCAV's capable of 2 1000lb bombs or Air to Air missiles with a high speed UCAV mainly for operation within 250km of their bases for intercept and Close Combat missions + UCAV's for strike missions up to 800km and focused it's efforts on manned fighters on producing ~12 larger more capable fighters like the F15