Department of Ocean Engineering, Korea Maritime and Ocean University, Busan 49112, Republic of Korea.
Department of Convergence Study on the Ocean Science and Technology, Korea Maritime and Ocean University, Busan 49112, Republic of Korea.
J Acoust Soc Am. 2023 May 1;153(5):3065. doi: 10.1121/10.0019552.
When using a sparse array, locating the target signal of a high-frequency component is difficult. Although forecasting the direction in a sparse situation is challenging, the frequency-wavenumber (f-k) spectrum can simultaneously determine the direction and frequency of the analyzed signal. The striation of the f-k spectrum shifts along the wavenumber axis in a sparse situation, which reduces the spatial resolution required to determine the target's direction using the f-k spectrum. In this study, f-k spectra of a high-frequency signal were used for near-field source localization. Snapping shrimp sounds (5-24 kHz) from SAVEX15 (a shallow-water acoustic variability experiment conducted in May 2015) were used as the data source, and a simulation was used to evaluate the proposed method. Beam steering was performed before creating the f-k spectrum to improve spatial resolution. We found that the spatial resolution was improved, and the location of the sound source could be determined when a signal with beam steering was utilized. The shrimp sound from SAVEX15, a near-field broadband signal, was used to determine the shrimp's location (range, 38 m; depth, 100 m) and the tilt of the vertical line array. These results suggest that the proposed analysis helps to accurately estimate the location of sound source.
在使用稀疏数组时，很难找到高频分量的目标信号。虽然在稀疏情况下预测方向具有挑战性，但频率波数（f-k）谱可以同时确定分析信号的方向和频率。在稀疏情况下，f-k 谱的条纹沿着波数轴移动，这降低了使用 f-k 谱确定目标方向所需的空间分辨率。在这项研究中，高频信号的 f-k 谱用于近场源定位。使用来自 SAVEX15（2015 年 5 月进行的浅水声变实验）的 snapping 虾声（5-24 kHz）作为数据源，并使用模拟来评估所提出的方法。在创建 f-k 谱之前进行波束转向以提高空间分辨率。我们发现，当使用具有波束转向的信号时，空间分辨率得到了提高，并且可以确定声源的位置。来自 SAVEX15 的虾声是一个近场宽带信号，用于确定虾的位置（范围 38 m；深度 100 m）和垂直线阵的倾斜度。这些结果表明，所提出的分析有助于准确估计声源的位置。
