Bilal9
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In essence, it IS Talwar but with VL Shtil (which makes Grogorovich better able to use Shtil missiles against modern air threats). If IN decides to give Talwar a MLU in which the SRL is replaced with 2x12 VLU, its equal again. Talwars mare have some advantages in EW and ASW/Sonar over the Grogorovich.
Talwars have some indigenous systems. In Talwars weren't the hull mounted sonars (HUMSA) local (Bharat Electronics Limited HMS-X)?
Passive towed array sonars (PTAS) and low frequency active towed array sonar (ATAS) units were however sourced from overseas. ATAS units apparently yield better resolution and range compared to HUMSA type sonars. They ordered six ATAS from ATLAS Elektronik and apparently some of these will equip the Talwar class. The AE 70 mm ATAS operates from about 2 kHz low-frequency range, covers 60 kilometers and boasts an automatic torpedo warning system.
Their Naval Physical and Oceanographic Laboratory (NPOL) in Kochi tried to offer an ALTAS (advanced light towed array sonar) to the IN but the IN rejected it (2009).