For me there can be two possibilities:I am unsure on multiple projects ERSAM XRSAM though, ERSAM is what, extended range? X or Ex whatever they pronounce maybe its just XRSAM system. I know that old sky blue pic where DRDO revealed ERSAM, but that one is quite old & later evolved into being called XRSAM? Maybe its just XRSAM pronounced exRSAM (aka ERSAM)
1. ERSAM = Enhanced Range SAM
XRSAM = eXtended Range SAM
2. ERSAM = Extended Range SAM
XRSAM = eXtreme Range SAM .
If we go by this pic, here it is mentioned that the missiles will be having the Active Radar Homing Seeker.