首页|Array Gain Prediction of Horizontal Line Array Using Monitoring Sea Surface Fluctuations

Array Gain Prediction of Horizontal Line Array Using Monitoring Sea Surface Fluctuations

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As an important parameter for evaluating sonar detection performance， array gain depends on the spatial-temporal correlations of the acoustic field。 Acoustic scattering from the sea bottom and surface fluctuations has a significant influence on sound propagation under the circumstances of rough boundaries and high frequencies。 Based on the normal-mode perturbation theory in shallow water with rough boundaries， this paper studies the effects of surface fluctuations on the transmission loss， horizontal correlations of the acoustic field， and conventional beamforming array gain of a horizontal line array。 The simulation results show that the attenuation coefficients of higher-order modes are larger than that of lower-order modes due to the acoustic scattering caused by surface fluctuations。 In other words， the rough surface makes the higher-order modes attenuate greatly， resulting in the interference fluctuations of transmission loss concerning the distance being weakened to a certain degree。 Therefore， the horizontal spatial correlation fading of the acoustic field is slowed down， making the array gain of the horizontal line array with rough boundaries slightly higher than that with flat boundaries。

Sea surfaceFluctuationsCorrelationAcoustic scatteringAcoustic arraysPropagation lossesAttenuation

Yuan Gao、Guang-Ying Zheng

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Hangzhou Applied Acoustics Research Institute, Hangzhou, China

International Conference on Geology, Mapping and Remote Sensing

Zhoushan(CN)

2022 3rd International Conference on Geology, Mapping and Remote Sensing

332-337

2022

10.1109/ICGMRS55602.2022.9849340