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The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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Combat Systems: Status of the Navy's Airborne Low Frequency Sonar Program.

ADA239709

Publication Date	1991
Page Count	15
Abstract	The Airborne Low Frequency Sonar system is being designed to provide a long-range active search capability to detect, localize, and classify sub-surface threats. The sonar is a dipping sonar, which is an acoustic sensor that is lowered into the water from a helicopter, searches for submarine sounds, and then is raised back into the helicopter by cable. The sounds detected by the sonar are analyzed by an acoustic processor on board the helicopter. This system can also process and display data obtained from sonobuoys, another device used to detect enemy submarines. The sonar can operate in a passive or active mode. A passive sonar listens for noises generated from submarines, whereas an active sonar transmits sounds that reflect off large objects in the water. The Navy developed the sonar system primarily to replace the AN/AQS-13F dipping sonar system on the SH-60F helicopter, which is deployed on aircraft carriers. The system was also developed to supplement active and passive sonobuoys on the SH-60B helicopter, which is deployed from surface ships.
Keywords	Acoustic detectors Passive sonar Acoustic equipment Aircraft carriers Cables Data displays Deployment Enemy Helicopters Long range(Distance) Noise Ocean surface Processing equipment Searching Ships Sonar Sonobuoys Sound Submarines Subsurface Threats Water Weapon systems Active sonar ALFS(Airborne Low Frequency Sonar) Dipping sonar Underwater sound AN/AQS-13F Sonar SH-60F Helicopters Naval equipment
Source Agency	Non Paid ADAS
NTIS Subject Category	63A - Acoustic Detection 74C - Antisubmarine Warfare
Corporate Authors	General Accounting Office, Washington, DC. National Security and International Affairs Div.
Supplemental Notes	Report to the Secretary of Defense
Document Type	Technical Report
NTIS Issue Number	199123

Combat Systems: Status of the Navy's Airborne Low Frequency Sonar Program.

Combat Systems: Status of the Navy's Airborne Low Frequency Sonar Program.
ADA239709

Publication Date	1991
Page Count	15
Abstract	The Airborne Low Frequency Sonar system is being designed to provide a long-range active search capability to detect, localize, and classify sub-surface threats. The sonar is a dipping sonar, which is an acoustic sensor that is lowered into the water from a helicopter, searches for submarine sounds, and then is raised back into the helicopter by cable. The sounds detected by the sonar are analyzed by an acoustic processor on board the helicopter. This system can also process and display data obtained from sonobuoys, another device used to detect enemy submarines. The sonar can operate in a passive or active mode. A passive sonar listens for noises generated from submarines, whereas an active sonar transmits sounds that reflect off large objects in the water. The Navy developed the sonar system primarily to replace the AN/AQS-13F dipping sonar system on the SH-60F helicopter, which is deployed on aircraft carriers. The system was also developed to supplement active and passive sonobuoys on the SH-60B helicopter, which is deployed from surface ships.
Keywords	Acoustic detectors Passive sonar Acoustic equipment Aircraft carriers Cables Data displays Deployment Enemy Helicopters Long range(Distance) Noise Ocean surface Processing equipment Searching Ships Sonar Sonobuoys Sound Submarines Subsurface Threats Water Weapon systems Active sonar ALFS(Airborne Low Frequency Sonar) Dipping sonar Underwater sound AN/AQS-13F Sonar SH-60F Helicopters Naval equipment
Source Agency	Non Paid ADAS
NTIS Subject Category	63A - Acoustic Detection 74C - Antisubmarine Warfare
Corporate Authors	General Accounting Office, Washington, DC. National Security and International Affairs Div.
Supplemental Notes	Report to the Secretary of Defense
Document Type	Technical Report
NTIS Issue Number	199123