ZOKA effectors are capable of operating effectively against any torpedo threat that has acoustic homing capability operating in active, passive or combined modes. Two types of ZOKA effectors, jammers and decoys, are used in HIZIR-Torpedo Countermeasure System for Surface Ships and ZARGANA-Torpedo Countermeasure System for Submarines.
ZOKA jammers transmit wide band high-level noise to saturate acoustic operating frequency bands of all existing torpedoes. In this way, jammers mask the noise of submarines against passive torpedoes and reduce the detection range of echo signals reflecting from the submarine by increasing the noise level against active torpedoes.
ZOKA decoys deceive and confuse the torpedo by simulating the acoustic and dynamic characteristics of the platform and attract the torpedo to themselves. ZOKA decoys have separate receive and transmit sections. A hydrophone is towed from the stern of the decoy. Having separate receive and transmit units allow decoy to perform noise generation and echo generation of torpedo active pulses at the same time.
The combined use of ZOKA decoys and jammers has been highly effective against acoustic torpedoes. ZOKA effectors with various lengths have mobile capability in vertical and/or horizontal plane and can be launched from surface ship launchers, submarine signal ejectors and submarine outboard launchers.