OPTIMUM THEORETICAL STRUCTURES OF SONAR SYSTEMS EMPLOYING SPATIALLY- DISTRIBUTED RECEIVING ELEMENTS
SACLANT ASW RESEARCH CENTRE LA SPEZIA (ITALY)
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The paper reviews the structure of optimum active sonar systems employing spatially distributed receiving elements. The systems considered operate in the presence of a time-variable noise field and in a randomly-varying transmission medium. The required signal-processing operations can be divided into two groups, one depending upon the noise characteristics and the other upon the signal characteristics. The noise-dependent processor is studied with special emphasis on structures that can adapt themselves to a time-varying noise field. The signal-dependent processor is derived for some simple types of random signal distortion. The signal characteristics required for the instrumentation of such processors are related to the impulse response of the target-medium combination.
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