passive sonar

8.03  passive sonar. Method or equipment by which information concerning a distant object is generated by analyzing the sound generated by the...

active sonar

8.02  active sonar. Method or equipment by which information concerning a distant object is obtained by evaluating its effects on the sound generated by the equipment. Annotation             ...

sonar

8.01  sonar. Method or equipment used to obtain information regarding objects in the sea by means of underwater sound. Annotation              The term sonar is an acronym for SOund Navigation...

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