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Ultra Electronics Underwater Warfare Benefits of the QUAD® LFA Receiver Array: • Allows port/starboard signal discrimination • Redundant data and power routing architectures ensures high reliability • Cost-effective Anti-Submarine Warfare and torpedo defence solution • High dynamic range sensor for LFA sonar applications • Can be deployed in a single tow with Ultra’s Horizontal Projector Array • Includes health monitoring with continuous built-in test Maritime Systems With the proliferation of extremely quiet con- ventional submarines, and a new generation of quieter and more sophisticated torpe- does, rapid underwater threat detection and localization is a critical operational capability. Low Frequency Active (LFA) sonars using horizontal arrays of omnidirectional hydro- phones form beams that are symmetrical about the array axis, and as such require multiple transmissions to determine wheth- er a target is on a port or starboard bear- ing. On the other hand, LFA sonars using Ultra’s QUAD® receiver array generate full sets of separate port and starboard beams, allowing the sonar to fully resolve the tar- get direction using a single transmission. Ultra's QUAD receiver array can assist with port/starboard target ambiguity resolution of passive sonars. The operator immediately knows the target’s true bearing without the need for time-consuming ship manoeuvres. Ultra’s QUAD® receiver array also im- proves detection performance by dis- criminating between the reverbera- tion and noise coming from the port and starboard sides of the receiver array. Ultra’s QUAD® receiver array is based upon robust omnidirectional towed array tech- nology that was operationally proven in Canada, the UK, Turkey, and New Zealand, . The design is flexible; inter-element spacing and acoustic aperture can be configured to suit operational and per- formance requirements. Although typi- cally delivered in a two-octave centre nested configuration, single or triple octave configurations can be pro- vided. The QUAD® receiver mod- ule can be delivered with an integral high-frequency acoustic intercept receiver and an integrated omnidirec- tional sensor array to support bistatic and multistatic operations with the ship's HMS. In addition to the QUAD® module, a complete receiver array includes fore and aft vibration isolation modules, non-acoustic sensor mod- ules, plus a rope drogue. Omnidirectional receiver modules can be included to sup- port VLF passive performance or enhanced multistatic operations. Ultra’s on-board ar- ray receiver connects with the array over a fibre-optic tow cable, providing DC power as well as receiving acoustic and non-acoustic data. The array receiver provides acoustic and non-acoustic data to a sonar signal pro- cessor over a standard network interface. Variants of the QUAD® array are op- erational with the Royal Austral- ian Navy and the Royal Netherlands Navy. QUAD® LFA RECEIVER ARRAY High-Performance Low Frequency Active Sonar Receiver
