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Model 980 Active Low-Frequency Towed Sonar

Detection and tracking are provided for both active and passive operations

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

L3Harris Towed Sonar Performs in Littoral, Shallow Water Environments 

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

L3Harris also offers shore-based sonar training.

  • Open systems architecture
  • Single tow active and passive sonar detects, classifies and localizes below layer threats
  • Torpedo defense and optional countermeasures
  • Intuitive user interface
  • High speed towing
  • Configurable for small and large ships
  • Port/Starboard ambiguity resolution
  • Full azimuth coverage in broadband and narrowband
  • High speed tow: 22 knots operational, 30 knots survivable 
  • Directional transmission 
  • Embedded high fidelity trainer 
  • Automatic depth keeping 
  • Automatic bottom avoidance 
  • Short scope tow 
  • Small/large ship configurable - 1⁄2 the weight of comparable systems 
  • Simultaneous active and passive operation 
  • Simultaneous CW and FM processing 
  • Proven tow body 
  • High capacity recording system 
  • Port/starboard ambiguity resolution 
  • Multitarget tracking 
  • Open systems architecture 
  • Torpedo detection 
  • Embedded XBT/Performance Prediction system 
  • Active 360° search 
  • Active sector search 
  • Active classification (3-D display) 
  • Tactical geographic display 
  • Built-in test reporting 
  • Performance prediction 
  • Passive classification (DEMON) 
  • Passive broadband search and track 
  • Long-range detection 
  • Left/right ambiguity resolution 
  • Reverberation reduction 
  • Flow noise minimization at high speed 

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