USA: ACC’s T-SAS System Shows Off Its Mine-Hunting Capabilities

Advanced Acoustic Concepts (AAC), a joint venture between DRS Technologies and Thales, successfully demonstrated advanced mine-hunting capabilities with the US Navy during the 2013 Fleet Experimentation (FLEX) Unmanned Systems (UxS) Campaign.

By towing the unmanned high resolution synthetic aperture sonar (T-SAS), the system detected all exercise mines with increased area clearance rates.

According to the Space and Naval Warfare Systems Command (SPAWAR), the FY13 FLEX UxS Campaign Plan was developed to identify potential solutions to the fleet’s highest priority operational needs. Specifically, the Naval Warfare Development Center (NWDC), in coordination with the Navy Mine and Antisubmarine Warfare Command (NMAWC), solicited industry participation to demonstrate highly mature mine warfare capabilities that either improve large geographic area search or automate detection and classification of undersea mines and maritime IEDs.

During the FLEX at-sea demonstration off the coast of Camp Pendleton, CA, the T-SAS system augmented system operators by providing Automatic Target Recognition (ATR) sonar processing, enabling real-time (in-stride) detection and classification of exercise mines while eliminating the requirement to conduct post-mission analysis (PMA). The high-resolution SAS sensor combined with ATR processing provides fleet operators with improved probability of correct classification and dramatically reduced false alarms. Moreover, by eliminating the substantial PMA time commitment required by traditional mine hunting systems, the T-SAS provides the US Navy with a game-changing capability to increase area clearance rates and reduce the overall mine warfare detect-to-engage timeline.

The FLEX demonstration offered the opportunity to operate in a high-clutter tactical mine warfare environment. Over three days, 1,100 contacts were processed in real-time with a final tally of 44 MILCOs (Mine-Like Contacts) and very low false alarm rates. T-SAS, a mature and highly reliable system, was operational throughout the entire demonstration with more than 60 hours of in-water operations.

The AAC T-SAS system is an upgraded version of the TSM 2054 Side Scan Sonar, which is towed from both manned and unmanned vessels and has been in service with the Danish Navy since the late 1990s. The T-SAS is currently in service in the French Navy and in an Asian country.

Its automated active control tow body (stabilization and automatic bottom following) is highly stable and produces extremely high quality Synthetic Aperture Sonar (SAS) images even in high sea state conditions with the highest resolution in service in the world. The system was recently qualified for operation with an unmanned surface vehicle (USV) as part of the French ESPADON program, the towed body being automatically deployed/recovered with a LARS (Launch and Automatic Recover System patented) up to high sea state. Additionally, the T-SAS is currently in production with a LARS to be installed on a USV for an Asian country.

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Press Release, November 22, 2013; Image: Thales