The structure of beam noise measured at the output of a vertical array in a range dependent ocean basin was investigated using the modified wide-angle parabolic equation (PE). Noise sources were distributed throughout the basin, and the field due to each noise source at an array located in the midbasin was calculated. The response of the array to the superposition of the noise sources was found by beamforming. An efficient and direct approach that superimposes the noise sources on the PE field as the field is marched toward the array was developed. Downslope calculations of the midbasin vertical directionality were made between 50 and 400 Hz with this technique. Use of a geoacoustic model shows that the bottom behaves as a low-pass filter.


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    Title :

    Deep-ocean vertical noise directionality


    Additional title:

    Vertikale Schallausrichtung im Tiefseebereich


    Contributors:
    Carey, W.M. (author) / Evans, R.B. (author) / Davis, J.A. (author) / Botseas, G. (author)

    Published in:

    Publication date :

    1990


    Size :

    11 Seiten, 23 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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