ASA 126th Meeting Denver 1993 October 4-8

3pPA6. Time-frequency representation of scattering from a target in a bounded medium.

Angie Sarkissian Charles F. Gaumond

Naval Res. Lab., Washington, DC 20375-5350

Timothy J. Yoder

SFA, Inc., Landover, MD 20785

Time-frequency representations applied to target scattering enable one to observe target characteristics that are of particular interest in inverse scattering problems. In this work such representations are extended to targets placed in a shallow water environment where target characteristics as well as shallow water characteristics appear in the time-frequency domain. The Gabor transformation is applied to scattering from an elastic shell placed in a bounded medium to display the combination of the waveguide effects (shallow water propagation) and the target effects (elastic wave propagation). The use of such representations for classification purposes is discussed.