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Proceedings Paper

Analysis and representation of sonar echo returns
Author(s): Roger H. Hackman; Theagenis J. Abatzoglou; Hal B. Arnold; John T. Reagan
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Paper Abstract

Active acoustic classification of underwater targets is an important problem of current interest. The echo return of such objects has components related to such distinct dynamical elements as the specular (geometric) return, reradiation of elastic resonances, diffracted (or Franz) waves, etc. The arrival times and spectral content of these components will generally give information about the structure and geometry of the scatterer. This information is reflected to the time- frequency structure of the echo return. In this paper, a comparative study is presented of the time-frequency analysis capability of a number of tools in applications to the echo structure of finite elastic cylinders. The time-frequency tools considered include the Wigner-Ville distribution, the Choi-Williams distribution, the Gabor transform, and the continuous wavelet transforms. The comparison is based on echo returns that have been synthesized from numerical T-matrix solutions to the associated free-field scattering problems.

Paper Details

Date Published: 15 October 1993
PDF: 10 pages
Proc. SPIE 1960, Automatic Object Recognition III, (15 October 1993); doi: 10.1117/12.160607
Show Author Affiliations
Roger H. Hackman, Lockheed Missiles & Space Co., Inc. (United States)
Theagenis J. Abatzoglou, Lockheed Missiles & Space Co., Inc. (United States)
Hal B. Arnold, Lockheed Missiles & Space Co., Inc. (United States)
John T. Reagan, Lockheed Missiles & Space Co., Inc. (United States)


Published in SPIE Proceedings Vol. 1960:
Automatic Object Recognition III
Firooz A. Sadjadi, Editor(s)

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