IF 2.1 2区 物理与天体物理 Q2 ACOUSTICS
Qi Zhang, Chao Wang, Lianglong Da, Rongxin Zhu
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引用次数: 0

摘要

各向同性场的环境噪声模型不适用于深海中的浅层平台,而估算目标的声射线到达-眩光-角度的传统方法没有考虑到表面噪声的影响。因此,本研究探讨了基于单一矢量水听器的目标参数估计方法。本研究采用的方法综合了水声物理模型、信号处理方法和海洋环境。针对浅层接收器建立了深海环境噪声矢量场时域模型,然后根据该模型推导出单矢量水听器的协方差矩阵。随后,利用从单矢量水听器推导出的协方差矩阵,制定了目标信噪比(SNR)估算方法。该方法通过将功率估算问题转化为协方差矩阵来解决任务,从而有效地解决了区分目标信号和噪声的难题。最后,提出了一种估算目标声射线到达-光栅化-角度的改进方法,旨在从理论上减轻表面噪声对目标信号的影响。从南海深海区域获得的实验数据表明,使用本研究提出的方法得出的结论与自动识别系统信息中得出的参考值一致。即使信噪比超过 -5 dB,该方法也能获得可靠的估计结果。本研究为信噪比和声射线到达-光栅角度估算开发的概念框架可随时应用于其他环境模型,这表明它在工程领域具有潜在的应用价值。这项研究的主要目的是为部署在深海的浅层接收器改进和增强水下声学信号处理方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Modeling of deep ocean ambient noise and sound-ray-arrival-grazing-angle estimation for shallow receivers.

The ambient noise model of isotropic fields is not applicable to shallow-located platforms in the deep ocean, and the conventional methods for estimating the sound-ray-arrival-grazing-angle of targets do not account for the effects of surface noise. Therefore, target parameter estimation methods based on a single vector hydrophone are explored in this study. The approach used in this study integrates the hydroacoustic physical model, signal processing method, and ocean ambient. A time-domain model of the vector field of deep ocean ambient noise was developed for receivers positioned at shallow depths, followed by derivation of the covariance matrix of the single vector hydrophone based on this model. Subsequently, a target signal-to-noise ratio (SNR) estimation method using the covariance matrix derived from the single vector hydrophone was formulated. This method effectively addresses the challenge of distinguishing between target signal and noise by transforming the power estimation problem into a covariance matrix solving the task. Finally, a refined approach for estimating the sound-ray-arrival-grazing-angle of target is proposed, aiming to theoretically mitigate the impact of surface noise on the target signal. The experimental data obtained from a deep ocean region in the South China Sea indicate that the findings obtained using the method proposed in this study are consistent with the reference values derived from automatic identification system information. The method also demonstrates reliable estimation results even when the SNR exceeds -5 dB. The conceptual framework developed for SNR and sound-ray-arrival-grazing-angle estimation in this study can be readily applied to other ambient models, indicating potential applications in engineering field. The primary objective of the study was to enhance and augment underwater acoustic signal processing methods for shallow receivers deployed in the deep ocean.

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来源期刊
CiteScore
4.60
自引率
16.70%
发文量
1433
审稿时长
4.7 months
期刊介绍: Since 1929 The Journal of the Acoustical Society of America has been the leading source of theoretical and experimental research results in the broad interdisciplinary study of sound. Subject coverage includes: linear and nonlinear acoustics; aeroacoustics, underwater sound and acoustical oceanography; ultrasonics and quantum acoustics; architectural and structural acoustics and vibration; speech, music and noise; psychology and physiology of hearing; engineering acoustics, transduction; bioacoustics, animal bioacoustics.
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