Surface Ship Torpedo Defense

The Surface Ship Torpedo Defense (SSTD) program is designed to bolster the Navy's ability to detect and neutralize torpedo threats through a comprehensive, layered defense system. This initiative includes several key components: the AN/SLQ-25 (NIXIE) system, the Torpedo Warning System (TWS), the Countermeasure Anti-Torpedo (CAT), and the Acoustic Device Countermeasure (Surface ADC MK2). The primary objective is to provide a robust detect-to-engage capability that can effectively protect High Value Units (HVUs) from torpedo attacks. The program has developed and deployed five Anti-Torpedo Torpedo Defense Systems (ATTDS) on aircraft carriers, each comprising a TWS and up to eight CATs.

In recent years, the SSTD program has focused on transitioning these systems back to their original configurations while maintaining essential capabilities. By FY23, three of the five ATTDS installations had been removed, with efforts continuing into FY24 and FY25 to complete this process. Concurrently, research and development efforts are underway to integrate TWS capabilities into the AN/SLQ-25 system through technological insertions. This integration aims to enhance torpedo detection, classification, and localization capabilities, ensuring that naval vessels remain equipped with cutting-edge defense technologies.

The program also emphasizes evaluating new technologies under initiatives like Future Naval Capabilities (FNC) and Small Business Innovative Research (SBIR). These evaluations assess the potential of emerging hardware and software solutions in realistic acoustic environments against projected threats. The goal is to incorporate effective innovations into the modular design of the AN/SLQ-25E system, allowing for future capability growth. Congressional support has facilitated additional research into improving safety and reliability aspects of these systems, particularly focusing on enhancements for the 25E's winch and reel components.

The SSTD program is committed to advancing torpedo defense capabilities through strategic development and integration of new technologies. By leveraging both internal resources and external partnerships, such as those with ARL Penn State and ULTRA, the program seeks to ensure that naval forces are well-equipped to counter evolving underwater threats effectively. The ongoing efforts reflect a balanced approach between maintaining current systems and investing in future advancements to sustain maritime security.