OVERVIEW: The RBU‑12000 “Udav‑1” is a 300 mm rocket salvo system introduced in the 1980s for naval torpedo decoy and anti-submarine defense. It is designed to launch salvos of acoustic-decoy or depth-charge rockets to intercept incoming torpedoes.

DETAILS: The system employs a ten-barrel KT‑153 launcher controlled by fire-control electronics, capable of automatic salvo deployment. It fires three types of rockets: 111SG depth charges, 111SZ mine-laying rounds, and 111SO acoustic decoy rockets, which generate false acoustic targets to seduce incoming homing torpedoes. With a maximum range of approximately 3 km and effective torpedo-seduction success rates of up to 90 percent in salvo mode, the RBU‑12000 is installed on major Russian surface combatants, including Kuznetsov-class carriers and Udaloy-class destroyers.

FONCTION:
Sonar detects incoming torpedo and calculates intercept parameters.
Launcher fires a salvo of decoy rockets toward the threat’s path.
Acoustic rockets generate false sonar signatures, luring torpedoes away from the ship.

SOURCE:
Wikipedia – “RBU‑12000” ; WeaponsSystems.net – “UDAV‑1” ; German Wikipedia – RBU‑12000 technical data