Аннотация
A method to obtain coherent acoustic wave fronts by measuring the
space-time correlation function of ocean noise between two hydrophones
is experimentally demonstrated. Though the sources of ocean noise
are uncorrelated, the time-averaged noise correlation function exhibits
deterministic waveguide arrival structure embedded in the time-domain
Green's function. A theoretical approach is derived for both volume
and surface noise sources. Shipping noise is also investigated and
simulated results are presented in deep or shallow water configurations.
The data of opportunity used to demonstrate the extraction of wave
fronts from ocean noise were taken from the synchronized vertical
receive arrays used in the frame of the North Pacific Laboratory
(NPAL) during time intervals when no source was transmitting.
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