Abstract
Medium turbulence, characterized by local variations in propagation speed, limits array size to the order of the correlation distance of the velocity perturbation. Array gain is lost when the array size significantly exceeds that distance. Adaptive beamforming eliminates this size constraint on the array. However, the scanning distance then turns out to be limited, the amount being proportional to the correlation distance and the proportionality constant being a function of the scanning direction. The size and shape of the scanning sector is calculated, along with the number of resolution cells that it contains, both for passive and active sonar systems.
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