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