Jisho

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戦術曳航
Wikipedia definition
1. Towed array sonarA towed array sonar is a sonar array that is towed behind a submarine or surface ship. It is basically a long cable, up to 5 km, with hydrophones that is trailed behind the ship when deployed. The hydrophones are placed at specific distances along the cable. On the first few hundred metres near the ship's propeller there are usually none since their effectiveness would be reduced by noise, vibration and turbulence generated by the propulsion.
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Read “戦術曳航ソナー” on Japanese Wikipedia
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