The Combined Influence of Wind Waves and Internal Waves on the Coherence of Low-Frequency Acoustic Signals and the Efficiency of Their Spatial Processing in Shallow Water
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引用次数: 0
Abstract
The combined influence of random internal waves and developed wind waves on the coherence and efficiency of spatial processing of narrowband acoustic signals in shallow water is studied analytically and numerically. A theoretical model is proposed for the correlation matrix of a multimode signal at the aperture of a horizontal array, using the difference in the spatiotemporal scales of acoustic field fluctuations caused by wind waves and internal waves. The results of numerical modeling for hydrological conditions in summer are presented. The array gain is analyzed for three spatial processing methods: phased array, optimal linear processing, and optimal quadratic processing. The main focus is on the dependence of the array gain on the intensity of wind waves and distance R between the source and the array. It is shown that, despite summer hydrology, wind waves can have a significant impact on the gain of a horizontal array over a wide range of distances R ~ 10–100 km.
通过分析和数值方法研究了随机内波和发达风波对浅水窄带声学信号的相干性和空间处理效率的综合影响。利用风波和内波引起的声场波动时空尺度的差异，提出了水平阵列孔径处多模信号相关矩阵的理论模型。介绍了夏季水文条件下的数值建模结果。分析了三种空间处理方法的阵列增益：相控阵、最优线性处理和最优二次处理。主要重点是阵列增益与风浪强度以及风浪源与阵列之间距离 R 的关系。结果表明，尽管有夏季水文的影响，但在 R ~ 10-100 千米的大距离范围内，风浪会对水平阵列的增益产生重大影响。
期刊介绍：
Acoustical Physics is an international peer reviewed journal published with the participation of the Russian Academy of Sciences. It covers theoretical and experimental aspects of basic and applied acoustics: classical problems of linear acoustics and wave theory; nonlinear acoustics; physical acoustics; ocean acoustics and hydroacoustics; atmospheric and aeroacoustics; acoustics of structurally inhomogeneous solids; geological acoustics; acoustical ecology, noise and vibration; chamber acoustics, musical acoustics; acoustic signals processing, computer simulations; acoustics of living systems, biomedical acoustics; physical principles of engineering acoustics. The journal publishes critical reviews, original articles, short communications, and letters to the editor. It covers theoretical and experimental aspects of basic and applied acoustics. The journal welcomes manuscripts from all countries in the English or Russian language.
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