sonars
Synonyms
Examples
AN/AQS-13 Dipping sonar deployed from an H-3 Sea King Underwater communications Dedicated sonars can be fitted to ships and submarines for underwater communication.
Four of the ships were upgraded with the addition of an eight-cell Mk 41 VLS with 32 Evolved Sea Sparrow (ESSM) missiles, and the Standard Missile SM-2, plus upgraded radars and sonars while the other two ships were decommissioned.
Because of the problems of ship noise, towed sonars are also used.
Frequencies and resolutions The frequencies of sonars range from infrasonic to above a megahertz.
In 1940, the US sonars typically consisted of a magnetostrictive transducer and an array of nickel tubes connected to a 1-foot-diameter steel plate attached back to back to a Rochelle salt crystal in a spherical housing.
In addition, the goal was to take advantage of modern sonars with a much larger detection range.