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sonar

noun
🔊/ˈsəʊnɑː(r)/
🔊/ˈsəʊnɑːr/
[uncountable]
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  1. equipment or a system for finding objects underwater using sound waves 声呐（利用声波探测水下物体的装置或系统）compare radar
    Oxford Collocations DictionarySonar is used before these nouns:
    • signal
    See full entry
    Word Origin1940s: from so(und) na(vigation and) r(anging), on the pattern of radar.