As underwater threats grow quieter, faster, and more networked, navies require an integrated approach that combines long-range detection, rapid classification, and decisive countermeasures. ASELSAN has built a comprehensive naval underwater warfare and torpedo defense portfolio that addresses this need end-to-end, covering surface ships, submarines, unmanned platforms, and maritime patrol assets. Designed for modern combat management systems and multi-static operations, these solutions emphasize adaptability, automation, and survivability in high-sea-state environments.
Long-Range Detection and Situational Awareness
At the heart of ASELSAN’s underwater domain awareness are its low-frequency towed sonar systems. DÜFAS 100/LR is a long-range active/passive towed sonar optimized for detecting and localizing submarines and torpedoes well beyond the thermal layer. Using separate active and passive arrays with advanced adaptive signal processing, the system delivers 360-degree omni-directional transmission and bi-static/multi-static operation. Its triplet towed array resolves port/starboard ambiguity, while selectable pulse types and lengths enable tailored search tactics. Beyond detection, DÜFAS 100/LR can optionally advise and execute torpedo countermeasure tactics, integrating ship maneuvers with towed and expendable decoys, providing commanders a coherent, time-critical response.
For platforms with space, weight, or deployment constraints, DÜFAS 100/CU offers a compact, lightweight alternative without sacrificing core features. The system’s modular architecture supports surface combatants of varying sizes and unmanned surface vehicles (USVs). It can be operated locally or remotely from a harbor-based control center or another surface platform, extending persistent surveillance with reduced risk to crewed assets. Containerized and decomposable configurations simplify logistics and integration, while independent backup subsystems ensure resilience at high speeds and sea states.
Smart Countermeasures Against Modern Torpedoes
Detection alone is not enough in an era of sophisticated acoustic homing torpedoes. ASELSAN’s ZOKA family delivers acoustic jammers and decoys engineered to counter passive, active, or combined homing modes. High-power broadband jamming creates an acoustic barrier, while programmable decoys emulate a platform’s dynamic and acoustic signatures, drawing threats away and buying precious time for evasive maneuvers. Tactical awareness, pre-launch programming, and real-time monitoring of torpedo behavior enable informed, agile responses during high-stress engagements.
Submarine and Surface Ship Protection
For submarines, HIZIR 100-S provides an integrated torpedo countermeasure system that fuses host-platform, threat, and sonar data to recommend optimal evasion tactics. Its decision-support system controls the programming and launch of expendable jammers and decoys from port and starboard, while high-fidelity simulation tools calculate escape probabilities through statistical runs. The result is a robust, semi-automated defensive layer that aligns with submarine operational depths and stealth requirements.
Surface fleets are protected by HIZIR 100-N, which combines a dedicated torpedo detection array with programmable towed and expendable countermeasures. Operating in full automatic or operator-approved modes, the system tracks and classifies threats at long range, selects optimal tactics from its database, and interfaces seamlessly with combat management and sonar systems. Its open architecture supports tailored upgrades and defense against simultaneous multi-torpedo attacks—an increasingly relevant scenario in contested littorals.
Extending the Sensor Web with Sonobuoys
Completing the underwater picture is aselBUOY 100 P, a passive directional sonobuoy designed for launch from maritime patrol aircraft, UAVs, USVs, or surface ships. Operating across 5–2400 Hz with selectable depths and durations, the sonobuoy transmits acoustic data via programmable VHF channels and supports post-launch control through UHF commands. As an expendable, NATO A-size system with long shelf life, aselBUOY enables distributed acoustic sensing to support shipborne sonars and countermeasure systems, enhancing operational effectiveness by improving detection probability and situational awareness.
An Integrated, Mission-Ready Approach
What differentiates ASELSAN’s naval portfolio is integration. From long-range detection to last-ditch countermeasures, each system is designed to interoperate with combat management systems, support onboard training and simulation, and remain effective in demanding maritime conditions. This layered architecture empowers navies to detect earlier, decide faster, and survive longer, across blue water, littoral, and unmanned operations.
As global navies adapt to evolving underwater threats, ASELSAN’s integrated sonar, countermeasure, and sonobuoy solutions offer a scalable, future-ready approach, delivering credible protection for both surface fleets and submarines in the world’s most challenging seas.
