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Cross-coherent vector sensor processing for spatially distributed glider networks.

Brendan Nichols1, Karim G Sabra1

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Autonomous underwater gliders can locate underwater sources using vector sensors. Cross-coherent processing improves positional accuracy by mitigating sea surface noise, outperforming traditional methods for distributed sensor networks.

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Area of Science:

  • Oceanography
  • Acoustics
  • Sensor Networks

Background:

  • Autonomous underwater gliders with vector sensors form distributed arrays for passive underwater source localization.
  • Current dead-reckoning methods lack the positional accuracy needed for robust array processing while gliders are submerged.
  • Surfacing gliders for Global Positioning System (GPS) fixes introduces sea surface noise, degrading acoustic data.

Purpose of the Study:

  • To evaluate advanced array processing techniques for improving underwater source localization accuracy using autonomous underwater gliders.
  • To compare the performance of cross-coherent processing against traditional incoherent processing in a noisy, dynamic environment.

Main Methods:

  • Utilizing autonomous underwater gliders equipped with vector sensors as a spatially distributed array.
  • Implementing cross-coherent array processing to mitigate local noise introduced by sea surface interactions.
  • Comparing source localization performance with traditional incoherent processing methods.

Main Results:

  • Cross-coherent array processing significantly enhances positional accuracy for underwater source localization.
  • The proposed method effectively mitigates noise from the acoustically active sea surface.
  • Performance gains were demonstrated over traditional incoherent processing techniques.

Conclusions:

  • Cross-coherent array processing is a superior method for source localization with distributed underwater glider sensor networks.
  • This technique overcomes limitations of dead-reckoning and reduces the impact of sea surface noise.
  • Improved localization accuracy has significant implications for underwater acoustic monitoring and exploration.