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Difference Factor of Vertical Beam Pattern for Shallow-Water Source Depth Discrimination
Acoustics Australia ( IF 1.7 ) Pub Date : 2021-01-03 , DOI: 10.1007/s40857-020-00215-0
Guang-Ying Zheng , Fang-Wei Zhu

This study addresses the problem of source depth discrimination in the context of shallow-water acoustics. From the perspective of beam pattern correlations, a discriminating characteristic quantity, which implies the information of source depth, is presented and defined as the difference factor of the vertical beam pattern. In applying the proposed difference factor for source depth discrimination, the corresponding discrimination method and judgment criterion are presented. Numerical results, obtained by processing SwellEx-96 data recorded by a vertical line array (VLA), indicate the potential of the proposed method in source depth discrimination. This method also shows the correct discrimination of VLA signals with different frequencies by using the plus/minus sign of the difference factors of the vertical beam pattern. Effects of array aperture, array depth, signal-to-noise ratio (SNR), and environment mismatch on the performance of the current method are also analyzed to indicate the robustness of the method. Finally, the SwellEx-96 data results indicate that the proposed method is insensitive to the initial range and radial speed from the VLA to the source target.



中文翻译:

浅水源深度判别的垂直波束方向图差异因子

这项研究解决了浅水声环境下声源深度判别的问题。从波束方向图相关性的角度出发,提出了一个表示源深度信息的区分特征量,并将其定义为垂直波束方向图的差异因子。在将提出的差异因子应用于源深度判别中,提出了相应的判别方法和判据。通过处理垂直线阵列(VLA)记录的SwellEx-96数据获得的数值结果表明,该方法在震源深度判别中的潜力。通过使用垂直波束方向图差异因子的正负号,该方法还可以正确区分具有不同频率的VLA信号。还分析了阵列孔径,阵列深度,信噪比(SNR)和环境不匹配对当前方法性能的影响,以表明该方法的鲁棒性。最后,SwellEx-96数据结果表明,该方法对从VLA到源目标的初始范围和径向速度不敏感。

更新日期:2021-01-03
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