| 31. | Modern naval warfare makes extensive use of both passive and active sonar from water-borne vessels, aircraft and fixed installations.
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| 32. | During this period he was also Technical Director of Project Artemis, a very large experimental active sonar system development.
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| 33. | Active sonar searches use a sound wave emitted to listen for any echo from the hulls of surface vessels.
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| 34. | The AQS-13 systems are all primarily active sonar transmitting in the upper end of the medium frequency sonar range.
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| 35. | The sound design consists of synthesized avant-garde music carried by a leitmotif in the form of an active sonar pulse.
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| 36. | The existence of the submarine is usually established through passive listening and refined with directional passive sensors and active sonar.
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| 37. | When active sonar is used, scattering occurs from small objects in the sea as well as from the bottom and surface.
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| 38. | In some species, such as bats and dolphins, the relationship is expanded in specific areas to support their active sonar capability.
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| 39. | The first passive sonar hydrophones were introduced into the RN in 1914 while ASDIC ( active sonar ) came in afterwards.
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| 40. | An active sonar system was scheduled to be installed in June 1940, but it is uncertain when it was actually done.
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