The buoy sends sonar signals into the water, then analyzes the echo.

The image the sonar signal reflects looks much like a photograph that has been copied three or four times.

"They probably have sensors stationed on the bottom that pick up sonar signals."

A sonar signal would be designed to produce sound, but very layered and complex.

"Still no active sonar signals coming from the target formation, sir."

The pilot reached up to flip a switch to feed the sonar signal into his headset.

Another system can differentiate between a submerged rock and a cylinder 90 percent of the time by using sonar signals.

That'll pull all sonar signals straight down to the bottom.

Though inadequate for seismic predictions, it worked very well indeed in analyzing sonar signals.

They have impaired vision due to the muddy river water but use sonar signals to navigate.