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Statements

Subject Item
dbr:Diver_detection_sonar
rdfs:label
Diver detection sonar
rdfs:comment
Diver detection sonar (DDS) systems are sonar and acoustic location systems employed underwater for the detection of divers and submerged swimmer delivery vehicles (SDVs). The purpose of this type of sonar system is to provide detection, tracking and classification information on underwater threats that could endanger property and lives. Further, this information is useful only to the extent that it is made available to authorities in time to make possible the desired response to the threat, be it deterrent or defensive action. Subsurface threats are a difficult problem, because reliable detection is available to date chiefly by use of high-resolution active sonar or trained dolphins or sea lions.The threat of an underwater terrorist attack is a concern to the maritime industry and port la
dcterms:subject
dbc:Diver-detector_sonars
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dbo:wikiPageRevisionID
1105461828
dbo:wikiPageWikiLink
dbr:Port_security dbr:Open-circuit_scuba dbr:Limpet_mine dbr:Wave_propagation dbr:Pier dbr:Shoaling_and_schooling dbr:Passive_sonar n8:WQX-2 dbr:Magnetism dbr:Rebreather dbr:Hull_(watercraft) dbr:Acoustic_location dbr:Underwater_security dbr:Diver_propulsion_vehicle dbr:Echograph dbr:DDS-03 dbr:Sea_lion dbr:Dolphin dbr:Signal_processing dbr:Sonar dbr:Reverberation dbr:Beam_forming dbr:Turbid dbc:Diver-detector_sonars dbr:Cerberus_Swimmer_Detection_System dbr:Port_of_Gdańsk dbr:Attenuation dbr:Electromagnetic_radiation dbr:Scuba_set dbr:Anti-frogman_techniques dbr:Nautical_chart dbr:Surveillance dbr:Seabed
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dbt:Essay dbt:Short_description dbt:Underwater_diving dbt:Reflist
dbo:abstract
Diver detection sonar (DDS) systems are sonar and acoustic location systems employed underwater for the detection of divers and submerged swimmer delivery vehicles (SDVs). The purpose of this type of sonar system is to provide detection, tracking and classification information on underwater threats that could endanger property and lives. Further, this information is useful only to the extent that it is made available to authorities in time to make possible the desired response to the threat, be it deterrent or defensive action. Subsurface threats are a difficult problem, because reliable detection is available to date chiefly by use of high-resolution active sonar or trained dolphins or sea lions.The threat of an underwater terrorist attack is a concern to the maritime industry and port law enforcement agencies. Ports face a range of threats from swimmers, boat-delivered ordnance such as limpet mines and other forms of improvised underwater explosive devices.DDS systems have been developed to provide for ports, coastal facilities, offshore installations, pipelines and ships. Due to the variety of life and objects that exist under the water, it is desirable that a DDS system be capable of distinguishing between large sea mammals, shoals of fish; a ship's wake; a diver with an open circuit scuba set and a stealth diver with a rebreather.DDS systems have been developed that can be mounted on the seabed, on a pier or on the hull of a vessel. For complete port security these systems are integrated with the surface surveillance and security systems employed at ports, coastal facilities and offshore installations. Various systems provide specialized features to facilitate their use in port security systems including automatic detection features.
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