The first target was now gone, its sonar signature lost in the fireball of the Nagasakis.

There was no doubt that it would have been outfitted with all the bells and whistles and with his DPV, Harvath was unquestionably giving off a small, but distinct sonar signature.

The shape is optimized for minimal active sonar signature and minimal water resistance and, although it complicated the design, it was essential for providing required maneuverability.

As it opens, an American submarine under the command of Commander Habley is attacked by an enemy submarine that has no sonar signature.

Well, not exactly a decoy-some nice noisy traffic heading our way that can hide our sonar signature.

The sonar operators on board Princeton detected Cheyenne's knuckle soon afterward, and recognized Mack's sonar signature quickly.

More than 39,000 acoustic tiles mask the vessel's sonar signature, giving the Astute class a better stealth quality than any other submarine previously operated by the Royal Navy.

When observing the sonar signature of Shipwreck D, a long, slender upright feature on the sea-bed, transformed itself into a wooden mast.

He wanted to cast as little sonar signature as possible.

Noise reduction, resulting in a low sonar signature; this particular system has little in common with other pump-jet propulsors and is also known as "shrouded propeller configuration"; applications: