Shiv-ji,
Multi Mission Surveillance Radar. I believe it was a LRDE program to develop a radar which could both do 3D Surveillance & also step in for fire control. There is one challenge though. Suppose you have a target from x, but need to keep looking at y,z then the target refresh for x will drop. Hence DRDO moved to the new 4 - side AESA approach and 2 radars, which are very similar in design. One as surveillance, 4 as battery fire control radars but with secondary surveillance function. So while 1-2-3 panels (say) guide the missile (i would presume there are separate data links to do the actual guidance but at least missiles can be fired simultaneously in multiple directions), the 4th panel can keep doing surveillance onlee. With timesharing, the other 3 panels can do both fire control & surveillance. Meanwhile at the command post, one radar is doing purely surveillance. Its a nifty idea.
The con is that if you see the above rotating MMSR pic, it has a much bigger sized radar array. Tht means advantages in power, resolution etc but these things are always trade offs and the 30 mtr resolution, can resolve targets located 30 mtrs from each other & guide in a missile with around 10 mtrs accuracy . That's good enough for an ARH class system. The warhead will do the rest & its onboard seeker.
In fact I presume tricksy things will be done. The Battery command post radar provides initial cueing, missile firing & angular/azimuth info from the SEOS optical sensors, range finding too (~16 km if the above report is accurately phrased, in contrast overall detection ranges can be 40 km
https://www.drdo.gov.in/drdo/pub/npc/20 ... eb2016.pdf and the radar only beeps once from the fire control for height finding. The targeted aircraft's jammer is of limited help.
