Lockheed Martin to build two additional TL-29A towed-array sonar systems to detect quiet submarines

Feb 20, 2018 | John Keller

SAN DIEGO – Undersea surveillance experts at Lockheed Martin Corp. will provide twin-line towed-array sonar systems to the U.S. Navy with the capability to detect quiet diesel- and nuclear-powered submarines.

Officials of the Space and Naval Warfare Systems Command (SPAWAR) in San Diego, announced a $50.9 million contract modification to the Lockheed Martin Rotary and Mission Systems segment in Liverpool, N.Y., on Friday for additional work on the twin line towed array (TL-29A) system.

The deal calls for Lockheed Martin to provide two TL-29A systems, one TL-29A spare array, two array refurbishments, and additional engineering services, material, and spares.


These twin-line towed-array sonar systems are to support the Naval Sea Systems Command's Maritime Surveillance Systems Program Office, Program Executive Office Submarines. The modification increases the original contract's value from $101.1 million to $151.9 million.

The twin-line 29A array (TL-29A) is a passive, low-frequency sensor system towed by the T-AGOS surveillance ship. Each array comprises a chain of acoustic, telemetry, and interface modules linked together in an integrated system.

The TL-29A's passive acoustic and signal-processing technologies can hear submarines at long range and in various sea states. The towed-array sonar is designed particularly to detect and track the new generation of extremely quiet diesel electric submarines operated by foreign navies.

The TL-29A sonar is configured as a pair of mile-long arrays that are towed side-by-side from an electro-optic tow cable attached to a winch on the deck of the host surface ship.

Two critical advantages of the TL-29A are its endurance and ability to be towed in the shallow waters of the littoral zones in coastal waters and in harbors.


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