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  2. Underwater acoustic positioning system - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustic...

    Also, the multiple sensors needed for the USBL transducer pole position and orientation compensation each introduce additional errors. Finally, the non-uniformity of the underwater acoustic environment cause signal refractions and reflections that have a greater impact on USBL positioning than is the case for the LBL geometry.

  3. Fishfinder - Wikipedia

    en.wikipedia.org/wiki/Fishfinder

    When the fish swims directly under the transducer, it is closer to the boat so the stronger signal shows a thicker line. As the fish swims away from the transducer, the distance increases, which shows as progressively deeper pixels. The image to the right shows a school of white bass aggressively feeding on a school of threadfin shad. Note the ...

  4. Ultra-short baseline acoustic positioning system - Wikipedia

    en.wikipedia.org/wiki/Ultra-short_baseline...

    Angles are measured by the transceiver, which contains an array of transducers. The transceiver head normally contains three or more transducers separated by a baseline of 10 cm or less, hence the "short baseline" name. A method called “phase-differencing” within this transducer array is used to calculate the direction to the subsea ...

  5. Deeper Fishfinder - Wikipedia

    en.wikipedia.org/wiki/Deeper_Fishfinder

    Deeper Smart Sonar is a wireless, castable echo-sounder compatible with iOS and Android smartphones and tablets. Wi-Fi connection enabled to maximize both the distance between the sounder and the device holder up to 330 ft / 100 m and the depth range up to 260 ft / 80 m.

  6. Underwater acoustic communication - Wikipedia

    en.wikipedia.org/wiki/Underwater_acoustic...

    This Emergency Position and Status Message (Class ID 0 Application 3 Plug-in) message shows a Portuguese submarine at 38.386547 latitude -9.055858 longitude at a depth of 16 meters. It is moving north at 1.4 knots, and has 43 survivors on board and shows the environmental conditions.

  7. Underwater searches - Wikipedia

    en.wikipedia.org/wiki/Underwater_searches

    A transducer array mounted in a streamlined housing (known as the "fish" or "towfish") can be towed behind a vessel at a desired depth to provide suitable resolution. The image is recorded and the position of the fish relative to the vessel correlated with positional input from the vessel, usually from GPS.

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