Abstract
As a sequel to an earlier paper, measurements have been obtained of the coherence of shallow water reverberation between two hydrophones separated distance apart horizontally. With the same techniques as before, the peak correlation coefficient at a given hydrophone spacing is found to be much lower when the hydrophones are separated horizontally than when separated vertically. The measured coefficients are found to be somewhat higher than theoretical expectations for a uniform distribution of sources in the horizontal plane, probably because the actual reverberation is distributed throughout a small angle in the vertical. The data obtained make possible the rational design of arrays for echo-ranging sonars in shallow water.
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