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Fielded sonar systems aboard today’s surface combatants are based on technology and components that are more than 30 years old. Many system components were custom built or of proprietary design and are now obsolete and long out of production.
As a result, navies throughout the world are experiencing obsolescence and maintenance issues. Subject matter experts are no longer available, making maintenance of these legacy sonars costly and impractical. This puts system readiness, training and performance at risk to meet today’s subsurface threats.
SQS-56(I)
The SQS-56(I), which utilizes the modular scalable sonar system MS3 architecture, is a modernized commercial off the-shelf (COTS) version of the AN/SQS-56 and DE1160 family of surface ship sonar systems. It is an integrated active and passive sonar system utilizing a hull-mounted array. The system’s capabilities include:
- Search
- Detection
- Passive threat filtering
- Localization
- Tracking
Multiple active sonar receivers, computer aided detection and tracking, and high-resolution processing for contact evaluation are used as part of active sonar operations. The system provides broadband, narrowband and DEMON passive processing. The SQS-56(I) can support both antisubmarine warfare, active and passive search, and small object avoidance, including Kingfi sher Mod 2 operations.
The MS3 architecture can be configured for 3.75, 7.5 and 12 kHz systems. The system is designed with simplified Ethernet interfaces between displays, signal processing, power amplification, signal reception, and ship’s combat system for an integrated and modular solution.
Multi-Tiered/Multi-Phased Sonar Modernization.
MS3 was developed and designed around the notion of maximum flexibility and preservation of investment, transitioning from phase to phase:
- Replace obsolete digital computer, controller and display hardware components with COTS hardware
- Replace transmitter and receiver using Raytheon-developed Digital Transmit Receive Module (DTRM)
- Migrate display/processor to combat management system (CMS)


