Time-Domain Sonar Target Response Modeling.
SPERRY RESEARCH CENTER SUDBURY MA
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The acoustic response of simple metallic targets submerged in water is studied under this contract. The aim is to develop an interpretation of the process which would permit its characterization by a simple model. This work is a continuation of a previous contract, which should be referred to for the general background of this problem and for greater detail of the space-time integral equation approach. The classical solution for acoustic scattering from a penetrable homogeneous sphere is studied first in Section 2. It is seen that hard or soft target approximations are not valid for metallic targets except at very low frequencies, but the resonances are present which are characteristic of the interior composition. Viewed in the time domain, the impulse response of a target consists of a sequence of pulses following the specular impulse. The arrival times of these pulses can be related directly to the elastic constants of the target and medium. In Section 4, the space-time integral equation approach is described. In Section 5, the results of previous sections are extended to the hulled target.
- Acoustic Detection and Detectors