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MODEL 980 ACTIVE LOW FREQUENCY TOWED SONAR (ALOFTS)The Model 980 Active Low Frequency Towed Sonar (ALOFTS) is tomorrow’s solution to counter the quiet diesel submarine in the littoral and deep ocean.

INTRODUCTION

The Harris Model 980 ALOFTS system is a robust, proven system with extensive at-sea operating time. A modular system tailored to meet customer requirements, ALOFTS has been fielded on Fast Attack Craft, Catamarans, and Frigates.

ALOFTS combines a high-powered, active source in a variable depth towed body with a directional towed array to receive active and passive signals. This combination allows high levels of acoustic energy to be transmitted by the active source in broad transmit beams which are then received by the narrow highly directional, noise rejecting receive beams of the towed array.

The towing and handling system combines the active source and passive towed array to achieve a single “short scope” tow, which provides rapid response to ship maneuvers and is effective in the littoral, shallow water environment where other towed arrays are ineffective. System features include depth control from the sonar operator’s console, automatic depth keeping and automatic bottom avoidance.

BENEFITS

Open systems architecture

Single tow active and passive sonar detects,classifies, and localizes below layer threats

Torpedo defense and optional countermeasures

Intuitive user interface

DESTROYER-SIZED PERFORMANCE PACKAGED FOR OFFSHORE PATROL VESSEL-SIZED PLATFORMS

About Harris CorporationHarris Corporation is a leading technology innovator that creates mission-critical solutions that connect, inform and protect the world. The company’s advanced technology provides information and insight to customers operating in demanding environments from ocean to orbit and everywhere in between. Harris has approximately $7.5 billion in annualized revenue and supports customers in about 100 countries through four customer-focused business segments: Communication Systems, Space and Intelligence Systems, Electronic Systems, and Critical Networks.

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FEATURES

High speed towing

Configurable for small and large ships

Port/ Starboard ambiguity resolution

Full azimuth coverage in broadband and narrowband

ALOFTS is a complete anti-submarine warfare (ASW) combat management system with scalable interfaces to torpedo fire control system, torpedo countermeasures, and the ship’s combat management system.

The ALOFTS user interface has been developed in conjunction with naval operators to produce a cohesive set of displays with operator efficiency in mind. This approach makes operation and training intuitive and provides a full range of active and passive formats, that include an underwater tactical picture, real-time performance prediction with XBT control, 3-D active classification, embedded trainer, target motion analysis, built-in-test (BIT), and other unique features.

ALOFTS

SYSTEM FEATURESHigh speed tow: 22 knots operational, 30 knots survivable Simultaneous CW and FM processing

Directional transmission Proven tow body

Embedded high fidelity trainer High capacity recording system

Automatic depth keeping Port/starboard ambiquity resolution

Automatic bottom avoidance Multitarget tracking

Short scope tow Open systems architecture

Small/large ship configurable - ½ the weight of comparable systems Torpedo detection

Simultaneous active and passive operation Embedded XBT /Performance Prediction system

DISPLAY FEATURES

Active 360 ° search Built-in test reporting

Active sector search Performance prediction

Active classification (3-D display) Passive classification (DEMON)

Tactical geographic display Passive broadband search and track

RESULTING CAPABILITIESLong-range detection Reverberation reduction

Left/right ambiguity resolution Flow noise minimization at high speed