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Using practical supergain for passive imaging with noise.

Martin Siderius1

  • 1Department of Electrical and Computer Engineering, Portland State University, Portland, Oregon 97201, USA. siderius@pdx.edu

The Journal of the Acoustical Society of America
|January 28, 2012
PubMed
Summary
This summary is machine-generated.

Ocean noise imaging using delay and sum beamforming offers a simpler, more robust alternative to adaptive methods. This technique achieves comparable seabed imaging results without the computational complexity and sensitivity issues of adaptive approaches.

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Area of Science:

  • Geophysics
  • Acoustics
  • Signal Processing

Background:

  • Ocean noise has been utilized for seabed imaging via endfire beamforming.
  • Initial techniques employed conventional beamforming, with later advancements incorporating adaptive beamforming.

Purpose of the Study:

  • To investigate the efficacy of delay and sum beamforming for seabed imaging.
  • To demonstrate that delay and sum beamforming can achieve results comparable to optimal adaptive methods.

Main Methods:

  • Application of the supergain concept.
  • Implementation of delay and sum beamforming for ocean noise analysis.

Main Results:

  • Delay and sum beamforming yields results similar to optimal adaptive beamforming.
  • The proposed method avoids the drawbacks associated with adaptive techniques, such as sensitivity to errors and computational demands.

Conclusions:

  • Delay and sum beamforming provides a practical and effective approach for seabed imaging using ocean noise.
  • This method presents a viable alternative to complex adaptive beamforming techniques in acoustic oceanography.