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首页> 外文期刊>The Journal of the Acoustical Society of America >Temporal coherence after multiple forward scattering through random three-dimensional inhomogeneities in an ocean waveguide
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Temporal coherence after multiple forward scattering through random three-dimensional inhomogeneities in an ocean waveguide

机译：海洋波导中通过随机三维不均匀性进行多次正向散射后的时间相干性

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摘要

An analytical expression is derived for the temporal coherence of an acoustic field after multiple forward scattering through random three-dimensional (3D) inhomogeneities in an ocean waveguide. This expression makes it possible to predict the coherence time scale of field fluctuations in ocean-acoustic measurements from knowledge of the oceanography. It is used to explain the time scale of acoustic field fluctuations observed at megameter ranges in various deep ocean-acoustic transmission experiments. It is shown that this time scale is nonlinearly related to the much longer coherence time scale of deep ocean internal waves through a multiple forward scattering process. It is also shown that 3D scattering effects become pronounced when the acoustic Fresnel width exceeds the cross-range coherence length of the deep ocean internal waves, which lead to frequency and range-dependent power losses in the forward field that may help to explain historic long range measurements. (C) 2008 Acoustical Society of America. [DOI: 10.1121/1.2967475]
机译：通过海洋波导中的随机三维（3D）不均匀性，进行多次前向散射后，得出声场的时间相干性的解析表达式。该表达式使得可以根据海洋学知识来预测海洋声测量中场波动的相干时间尺度。它用于解释在各种深海声传输实验中，在兆米范围内观察到的声场波动的时间尺度。结果表明，该时间尺度与深海内波通过多次前向散射过程的更长的相干时间尺度非线性相关。还表明，当菲涅耳声波宽度超过深海内波的跨范围相干长度时，3D散射效应变得明显，这会导致前向场中频率和范围相关的功率损耗，这可能有助于解释历史性长波。范围测量。 （C）2008年美国声学学会。 [DOI：10.1121 / 1.2967475]

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