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sonar ![click to hear : sonar click to hear : sonar](../../../images/speaker-vert.gif)
Detection system emitting ultrasound; it is used for detection mainly in a marine environment.
echo ![click to hear : echo click to hear : echo](../../../images/speaker-vert.gif)
Waves reflected by the target and measured by a remote sensing device.
ship ![click to hear : ship click to hear : ship](../../../images/speaker-vert.gif)
ultrasound waves emission ![click to hear : ultrasound waves emission click to hear : ultrasound waves emission](../../../images/speaker-vert.gif)
Production of very high-frequency sound vibrations whose echo is captured and analyzed.
target ![click to hear : target click to hear : target](../../../images/speaker-vert.gif)
Surface or object from which sonar waves reflect.