Coherence Variability of Arrays During Bearing Stake
2006
Neubert, J. A.
By the use of acoustic synoptic factors, this study investigates how the variable and random sound field structure influences the performance of wide-aperture, horizontal line array systems for low-frequency, narrowband sources in the northwestern Indian Ocean using data from the Bearing Stake exercise. Several acoustic synoptic factors are defined and illustrated. The patterned and coherence behavior of arrays is studied in detail. The degrading effects of an array turn are considered graphically and synoptically. The interaction of several of the acoustic synoptic factors is shown. The stability of time averages is investigated synoptically. It was found that the more stable the time average of the phase is, the better the coherence is. On the other hand, the stability of the time average of the amplitude had little impact on the coherence. Finally, it was shown that a normal mode model was suitable for representing the Bearing Stake results.
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