Mid-frequency tactical Anti-Submarine Warfare (ASW) sonars are designed to detect submarines over
several tens of kilometers. They are incorporated into the hulls of submarine-hunting surface vessels such
as destroyers, cruisers, and frigates. There are 117 of these sonars on U.S. Navy ships currently in active
service, and equivalent systems in allied navies (e.g., British, Canadian, French). The AN/SQS-53 is the
most advanced surface ship ASW sonar used by the U.S. Navy. The AN/SQS-53C sonar generates
frequency-modulated pulses of 1-2 second duration in the 1-5 kHz band, at source levels of 235 dB re 1µPa
@ 1 m or higher (Evans and England 2001). These sonars emit beams of sound in the horizontal direction.
The AN/SQS-53C is designed to perform direct-path ASW search, detection, localization, and tracking
from a hull mounted transducer array of 576 elements housed in a bulbous dome located below the
waterline of the ship’s bow. These systems are used to track both surface and submerged vessels, often
picking up surface ships at greater range than most radar systems.
Mid-frequency tactical Anti-Submarine Warfare (ASW) sonars are designed to detect submarines over
several tens of kilometers. They are incorporated into the hulls of submarine-hunting surface vessels such
as destroyers, cruisers, and frigates. There are 117 of these sonars on U.S. Navy ships currently in active
service, and equivalent systems in allied navies (e.g., British, Canadian, French). The AN/SQS-53 is the
most advanced surface ship ASW sonar used by the U.S. Navy. The AN/SQS-53C sonar generates
frequency-modulated pulses of 1-2 second duration in the 1-5 kHz band, at source levels of 235 dB re 1µPa
@ 1 m or higher (Evans and England 2001). These sonars emit beams of sound in the horizontal direction.
The AN/SQS-53C is designed to perform direct-path ASW search, detection, localization, and tracking
from a hull mounted transducer array of 576 elements housed in a bulbous dome located below the
waterline of the ship’s bow. These systems are used to track both surface and submerged vessels, often
picking up surface ships at greater range than most radar systems.
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