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Clutter suppression and classification using twin inverted pulse sonar in ship wakes.

T G Leighton1, D C Finfer, G H Chua

  • 1Institute of Sound and Vibration Research, University of Southampton, Highfield, Southampton SO17 1BJ, UK. tgl@soton.ac.uk

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Twin inverted pulse sonar (TWIPS) effectively distinguishes wake scatter from seabed scatter. This advanced sonar technology improves seabed detection through vessel wakes, outperforming conventional methods.

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Area of Science:

  • Oceanography
  • Marine acoustics
  • Sonar technology

Background:

  • Vessel wakes create acoustic interference, complicating seabed sonar detection.
  • Conventional sonar processing struggles to differentiate wake noise from seabed signals.

Purpose of the Study:

  • To evaluate the efficacy of Twin Inverted Pulse Sonar (TWIPS) in distinguishing wake scatter from seabed scatter.
  • To assess TWIPS's capability in enhancing seabed detectability through vessel wakes compared to traditional sonar.

Main Methods:

  • Deployment of TWIPS in the wake of a rigid inflatable boat (RIB) and a moving tanker.
  • Analysis of acoustic scatter distinguishing linear and nonlinear targets.
  • Categorization of nonlinear scatterers based on even and odd harmonic energy distribution.

Main Results:

  • TWIPS successfully differentiated between wake and seabed acoustic scatter.
  • Improved seabed detectability was observed through vessel wakes using TWIPS.
  • TWIPS demonstrated the ability to classify nonlinear scatterers by harmonic power.

Conclusions:

  • TWIPS offers a significant advancement in sonar technology for marine environments with vessel traffic.
  • The harmonic analysis capability of TWIPS provides enhanced target discrimination.
  • TWIPS shows potential for simplifying sonar operations by reducing or eliminating the need for range correction.