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A dynamic depth estimation method for towed optical fiber hydrophone array.

Chengyan Peng1, Xueliang Zhang1

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This study introduces a novel method using optical fiber hydrophones to estimate the dynamic depth of towed arrays. The technique accurately measures array shape variations, crucial for underwater acoustic applications.

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Area of Science:

  • Oceanography
  • Acoustics
  • Sensor Technology

Background:

  • Towed arrays are essential for underwater acoustic measurements.
  • Estimating the dynamic depth and shape of towed arrays is challenging due to environmental factors and hydrostatic pressure.
  • Existing methods may be limited in accuracy or real-time applicability.

Purpose of the Study:

  • To propose and validate a new method for estimating the dynamic depth variation of a maneuverable towed array.
  • To leverage optical fiber hydrophones for precise depth measurements.
  • To assess the method's performance under varying towing conditions.

Main Methods:

  • Utilizing low-frequency components of hydrophone signals from an optical fiber array.
  • Applying signal processing techniques to mitigate the effects of hydrostatic pressure.
  • Conducting experimental validation with a 32-element towed array in a lake environment.
  • Comparing results with commercial depth sensors.

Main Results:

  • The proposed method accurately estimates the dynamic depth variation of the towed array.
  • Experimental data showed good agreement between the optical fiber hydrophone method and commercial depth sensors.
  • The temporal evolution of the array's shape in the vertical plane was successfully obtained at different towing speeds (4 and 8 knots).

Conclusions:

  • The developed method provides a reliable approach for estimating towed array dynamic depth.
  • Optical fiber hydrophones offer a viable solution for accurate underwater array shape monitoring.
  • This technique enhances the understanding and application of towed array systems in oceanographic and acoustic research.