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Calibration of vertical array tilt using snapping shrimp sound.

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Area of Science:

  • Oceanography
  • Acoustics
  • Marine Biology

Background:

  • Snapping shrimp are a primary source of high-frequency ambient noise in coastal waters.
  • Accurate calibration of underwater acoustic arrays is crucial for environmental monitoring.

Purpose of the Study:

  • To investigate the potential of using snapping shrimp sounds for calibrating vertical acoustic arrays.
  • To develop a method for localizing snapping shrimp and determining array tilt.

Main Methods:

  • Continuous recording of snapping shrimp sounds using a large-aperture vertical array.
  • Localization of snaps based on wavefront curvature and time-of-arrival data.
  • Constraining snap origins to the seabed to determine array tilt.

Main Results:

  • Successfully detected and localized hundreds of snapping shrimp snaps within a 500m radius.
  • Demonstrated that the maximal tilt in the range and tilt domain corresponds to the absolute array tilt.
  • Validated the method using both simulations and experimental data.

Conclusions:

  • Snapping shrimp can be utilized as a natural, opportunistic source for calibrating vertical acoustic array tilt.
  • This method offers a novel approach to acoustic array calibration in shallow marine environments.