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Inversion for a moving spherical target's positional, structural, and speed parameters.

John A Fawcett1, Stan E Dosso

  • 1Defence R&D Canada Atlantic, P.O. Box 1012, Dartmouth, Nova Scotia, B2Y 3Z7, Canada. john.fawcett@drdc-rddc.gc.ca

The Journal of the Acoustical Society of America
|July 19, 2013
PubMed
Summary
This summary is machine-generated.

This study shows that a single wideband echo can accurately determine a spherical target's position, speed, and physical properties in shallow water waveguides, even with noise. This aids in target classification despite complex acoustic conditions.

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Area of Science:

  • Acoustics
  • Signal Processing
  • Underwater Acoustics

Background:

  • Target echoes in shallow water are affected by multipath arrivals and waveguide propagation.
  • Moving targets introduce Doppler shifts, complicating echo analysis and target classification.
  • Distinguishing target echoes from clutter relies on broadband scattering characteristics.

Purpose of the Study:

  • To investigate the simultaneous determination of a spherical target's position (range, depth), radial speed, radius, shell thickness, and elastic parameters.
  • To assess the accuracy of parameter estimation from a single wideband echo in a waveguide environment.
  • To analyze the marginal probability distributions of estimated parameters.

Main Methods:

  • Analysis of broadband scattering characteristics of spherical targets in shallow water waveguides.
  • Processing of wideband echoes considering multipath interference and Doppler shifts.
  • Estimation of target parameters using single-echo data and investigation of probability distributions.

Main Results:

  • Accurate estimation of multiple target parameters (position, speed, radius, shell properties) from a single wideband echo is achievable.
  • Positional and speed parameters of the sphere can be determined with high precision.
  • Parameter estimation accuracy varies, with some parameters determined more precisely than others, even in noisy conditions.

Conclusions:

  • A single wideband echo contains sufficient information for robust spherical target characterization in shallow water.
  • The method offers a promising approach for target identification and tracking in complex underwater acoustic environments.
  • Understanding interference effects and Doppler shifts is crucial for accurate target parameter estimation.