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passive sonar |
Also found in: Wikipedia, Hutchinson | 0.04 sec. |
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passive sonar [′pas·iv ′sō‚när] (engineering) Sonar that uses only underwater listening equipment, with no transmission of location-revealing pulses. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In the 1970s, Navy ships were able to use passive sonar to detect, most submarines. navy director, Submarine Warfare Division, Office of the Chief of Naval Operations, in testimony to Congress on submarine force structure and modernization, has stated that the navy now has the ability to detect advanced diesel submarines in littoral waters using passive sonar systems, at ranges they didn't think possible in the past. As opposed to passive sonar, which simply listens for unnatural sounds, active sonar produces a low-frequency signal (between 75 and 1,000 Hz) to create echoes off of hostile submarines. |
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