ASA 128th Meeting - Austin, Texas - 1994 Nov 28 .. Dec 02

2aSA3. Forward scattering from hemispherically end-capped cylindrical shell in shallow water.

Angie Sarkissian

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

When measuring the scattered field from a target in the exact forward direction, the presence of a significantly stronger indicident field makes the extraction of the scattered field difficult because the two signals arrive almost simultaneously. As the position of the target changes, the two signals arrive at distinct times to make the scattered field easier to extract. In a bounded medium, multipath arrivals produce additional complications by increasing the duration of the incident field. Frequency and time domain computations are made for the scattered field from a hemispherically end-capped cylindrical shell placed in a bounded medium where the geometry consists of a fixed source, a fixed receiver, and a target placed in between. The location of the target is varied, to compare the incident field to the scattered field in both intensity and arrival times.