Category Archives: acoustic

“Navy to establish additional unmanned task forces inspired by Task Force 59” –Defense Scoop

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GULF OF AQABA (Feb. 13, 2022) The U.S. Coast Guard Sentinel-class cutter USCGC Glen Harris (WPC 1144) sails near a U.S sail drone explorer during the International Maritime Exercise/Cutlass Express (IMX) 2022, Feb. 13, 2022. IMX/CE 2022 is the largest multinational training event in the Middle East, involving more than 60 nations and international organizations committed to enhancing partnerships and interoperability to strengthen maritime security and stability. (U.S. Army photo by Cpl. DeAndre Dawkins)

Defense Scoop reports:

“The Navy plans to stand up additional unmanned task forces around the globe modeled after Task Force 59 in the Middle East, Navy Secretary Carlos Del Toro told reporters Saturday…“We’ve demonstrated with Task Force 59 how much more we can do with these unmanned vehicles — as long as they’re closely integrated together in a [command and control] node that, you know, connects to our manned surface vehicles. And there’s been a lot of experimentation, it’s going to continue aggressively. And we’re going to start translating that to other regions of the world as well,” Del Toro said during a media roundtable at the Reagan National Defense Forum.”

The report goes on to mention 4th Fleet and Oceana specifically, both regions of intense interest to the Coast Guard in regard to drug interdiction and Illegal, Unregulated, Unreported (IUU) fishing respectively.

This could be a big boost to our Maritime Domain Awareness. In the Eastern Pacific Drug Transit Zone we might need uncrewed surface vessels with passive acoustic sensors since the targets of interest are poor targets for radar and optical sensors. That could lead to practical experience that could improve our ASW capability.

“SEA Completes Successful Trials Of KraitArray In The English Channel” –Naval News

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KraitArray (actual size) on SEA stand at DSEI 2019

Naval News reports,

“SEA, the UK’s defence and security electronic system specialist, has completed successful trials of its anti-submarine warfare (ASW) thin line towed array, KraitArray, in the English Channel – proving its exceptional sensing performance in small vessels.”

This seems to be another example of an ASW system being marketed for unmanned vessels that might also be used on cutters if the need should arise.

The company’s brochure does in fact specifically mention patrol craft and OPVs that are unable to accommodate full size towed arrays. In addition to the towed array, they also make active sonar systems, acoustic decoys, and light weight torpedo launchers.

A towed array might also be a good way to search for low profile smuggling vessels that have a minimal visual and radar cross section.

“Elbit Systems To Supply ASW Capabilities To An Asian-Pacific Navy” –Naval News

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Naval News Reports, Israeli defense contractor, Elbit Systems has been awarded contracts totaling about $56M to provide ASW capabilities to an unnamed Asia-Pacific country (my guess, the Philippines).

Elbit Systems will provide the Seagull™ USVs (Unmanned Surface Vessels) configured to perform ASW missions and the Towed Reelable Active Passive Sonar (TRAPS) systems. The Seagull USVs will integrate Helicopter/Ship Long-Range Active Sonars (HELRAS) and will be equipped with the Company’s autonomous suite, Combat Management System and Satellite Communication capability. The TRAPS systems, which will be installed onboard the customer’s corvettes, are low frequency variable-depth-sonars intended for detection, tracking and classification of submarines, midget submarines, surface vessels and torpedoes.

I love to see this stuff because it means there are ASW systems out there that are appropriate for cutters from the largest down to relatively small.

Using helicopter style dipping sonars on surface vessels is not new. The Soviets built a number of corvettes that used this approach (Petya, Mirka, and Koni classes), but the dipping sonars have gotten much better since then.

We have talked about TRAPS before:

HELRES, Helicopter Long Range Active Sonar, is a product of L3Harris, headquartered in Melbourne, FL.

Elbit Systems’ Seagull unmanned surface vessel. I do love this photo because it shows that even a very small vessel can launch light weight torpedoes.