passive sonar

This shallow water has turned our passive sonar inside out.

Using passive sonar was the normal routine in such a case.

They did not need passive sonar to hear the big American ships passing.

Passive sonar systems just listen for the noise other objects make.

Another use of passive sonar is to determine the target's trajectory.

Nothing could possibly be heard on the passive sonar.

"Passive sonar accuracy becomes much more ambiguous at close range."

In passive sonar operation the thermocline is the major issue.

Except watch and proceed cautiously in the same direction, using passive sonar for the moment.

They use passive sonar sensors to pick up underwater noise.

Passive sonar has several advantages, most importantly that it is silent.

Instead of hearing machinery, the ship sounds similar to rain on passive sonar.

Use of passive sonar makes it difficult to determine a contact's range, course, and speed (solution).

In the passive sonar, the system is essentially listening for the sounds made by the target objects.

Passive sonar detects the presence of mines dead ahead, sir.

To simplify, passive sonar "sees" around the ship using it.

He's deep, and their passive sonars are not as good as ours.

Her passive sonars had to have heard those Tomahawk-missile launches.

The line of colored blocks on the passive sonar display had lasted for seven minutes.

The Dallas also had to remain invisible to her quarry's passive sonar systems.

In any case I'm hoping that with the reactor shut down we won't be detected by passive sonar.

Passive sonar used to classify targets based on machinery noise.

And then again, even though he was still relying on passive sonar to warn him of any ship coming close aboard.

"But we believe passive sonar provides the best method for determining whether ships are operating in the area."

Performance analysis of active and passive sonar systems.