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Deep-ocean vertical noise directionality

机译:深海垂直噪声的指向性

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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.
机译:使用改进的广角抛物线方程(PE),研究了在依赖于距离的海盆中,在垂直阵列的输出处测得的光束噪声的结构。噪声源分布在整个盆地中,并计算了位于中流域阵列上每个噪声源所引起的场。通过波束成形发现了阵列对噪声源叠加的响应。开发了一种高效且直接的方法,可在场向阵列行进时将噪声源叠加在PE场上。用这种技术在50至400 Hz之间对中流域垂直方向的下坡度进行了计算。使用地声模型表明,底部的行为类似于低通滤波器。

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