{"id":32818,"date":"2022-04-01T00:48:44","date_gmt":"2022-04-01T00:48:44","guid":{"rendered":"https:\/\/one.sightlinemg.com\/defensenews\/uncategorized\/2022\/04\/01\/us-navy-to-terminate-dart-sonar-development-with-raytheon\/"},"modified":"2026-08-07T22:48:01","modified_gmt":"2026-08-07T22:48:01","slug":"us-navy-to-terminate-dart-sonar-development-with-raytheon","status":"publish","type":"post","link":"https:\/\/one.sightlinemg.com\/defensenews\/naval\/2022\/04\/01\/us-navy-to-terminate-dart-sonar-development-with-raytheon\/","title":{"rendered":"US Navy to terminate DART sonar development with Raytheon"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">WASHINGTON \u2014 The U.S. Navy will end its work with Raytheon Technologies developing a sonar for littoral combat ships and frigates and will instead buy a sonar already in use by several navies around the globe.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Raytheon\u2019s AN\/SQS-62 Variable Depth Sonar, also called the Dual-mode Array Transmitter, was a key component of the LCS anti-submarine warfare mission package and was going to be carried into the Constellation-class frigate program to create commonality within the surface force.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But the sonar, though it had succeeded in tracking a submarine in test events, still had two remaining technical challenges: the hydrodynamic stability of the system that trails behind the ship, and the performance and reliability of the transducers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.defensenews.com\/naval\/2022\/01\/11\/wanted-new-missions-for-the-littoral-combat-ship\/\">Defense News previously reported<\/a> the program office paused testing in September after realizing the hydrodynamic issues would require an active control system.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Program Executive Officer for Unmanned and Small Combatants Rear Adm. Casey Moton told Defense News on March 31 that around the same time the Navy became increasingly concerned about the risk this presented to the sonar development and whether the product would be a viable option for future ASW operations.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Coincidentally, the Navy was nearing a decision point with Fincantieri Marinette Marine on the final design of the frigate, as the ship\u2019s critical design review and production readiness review are coming up.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cIt really came down to our concern about the risk with the DART system \u2026 and risk to the design progress for frigate, and ultimately further on potentially down to if we got into production and had issues, production impact, performance impact,\u201d Moton said in a phone interview.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">At the same time, the Navy was considering cutting the number of LCS hulls in the fleet as part of cost-saving measures in the fiscal 2023 budget request. The <a href=\"https:\/\/www.defensenews.com\/naval\/2022\/03\/28\/us-navy-wants-to-cut-nine-lcss-eliminate-their-anti-submarine-mission\/\">service decided to nix the ASW mission package altogether<\/a>, reducing the number of hulls needed to carry out the other two missions: surface warfare and mine countermeasures.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cAs a result of increased risk and challenges experienced with the variable depth sonar,\u201d the Navy released a sources sought notice in early February, Moton said.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">After assessing the options, the service selected the CAPTAS-4, or Combined Active Passive Towed Array Sonar. The product is made by Advanced Acoustics Concepts, a joint venture between Leonardo DRS and Thales Defense &amp; Security.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The rear admiral said CAPTAS-4 was chosen in part due to its proven performance in international navies and its high technical readiness, lowering the risk in integrating it into the Navy\u2019s own undersea warfare combat system and frigate hull design.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Moton said that when shipbuilders were competing for the frigate design and construction contract Fincantieri won in 2020, they were allowed to pick between incorporating a hull-mounted sonar or the variable depth sonar towed along behind the ship.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">While the shipbuilder could select the style of sonar they wanted \u2014 with Fincantieri electing the VDS \u2014 the Navy reserved the right to dictate the system the builder would use. Raytheon\u2019s DART was previously the Navy\u2019s VDS of choice so it could achieve the cost savings in production, training and sustainment associated with having common systems across multiple ship classes, Moton said.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">But, he said, the Navy had worked with Raytheon to engineer, model and ultimately test several improvements to address the lingering technical problems with DART.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cIn those tests, we did not see the improved performance that we had been anticipating, and so it became clear that it was going to be more complex to solve than our initial round of efforts,\u201d he said.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Moton said Fincantieri supported the decision to move to a different sonar and helped look at the alternatives offered in responses to February\u2019s sources sought notice.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Moton declined to say how many companies offered up sonar solutions, other than to say Raytheon\u2019s DART was considered the incumbent and \u201cseveral other\u201d products were considered.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Thales\u2019 website notes the CAPTAS-4 is fielded on the French and Italian FREMMS \u2014 the Fincantieri frigate design that serves as the parent design for the Constellation-class FFGs \u2014 as well as British Type 23 and Type 26 frigates, Chilean Type 23 frigates and Spanish F110 frigates.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Moton said the U.S. Navy had some familiarity with the system from working alongside these allies in Europe, as well as through using the related Thales Airborne Low Frequency Sonar as a dipping sonar for the MH-60 Sea Hawk helicopters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">He said the sources sought notice asked companies to explain the technical maturity of the sonar, its performance and reliability in past at-sea operations, its integration on other ship classes, its potential integration into the SQQ-89 undersea warfare combat system and how well its production schedule would match that of the Constellation frigate line, among other questions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Moton said Advanced Acoustics Concepts and Fincantieri would still have to negotiate the price of the sonar, but he doesn\u2019t expect the change to significantly affect the program cost. Similarly, he said the Navy would have to conduct integration work between the sonar and the combat system, but he didn\u2019t expect that cost to be significantly different than planned.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Capt. Kevin Smith, the frigate program manager, said during the call that, with the new sonar selected to help reduce risk on the program, the frigate could move into its critical design review and production readiness review soon. <a href=\"https:\/\/www.navsea.navy.mil\/Portals\/103\/Documents\/Exhibits\/SNA2022\/SNA2022-CAPT-Smith-FFG62_Update.pdf\">Those milestones were previously expected to occur<\/a> in the second quarter and third quarter, respectively, of FY22.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u201cWe\u2019re not going to start [production] unless we feel we have a mature design so we don\u2019t relive some of the challenges we\u2019ve had with lead ship construction. I expect we will still have challenges, because lead ships are very hard, but we\u2019re trying to mitigate that as much as we can with a mature design,\u201d he said.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The Navy will end its work with Raytheon Technologies developing a sonar for littoral combat ships and the frigates, and the service will instead buy a sonar already in use by several navies around the 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