Low-Cost Acoustic Cameras for Underwater Wideband Passive Imaging
Low-Cost Acoustic Cameras for Underwater Wideband Passive Imaging
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DOI：
10.1109/joe.2014.2377454
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发表时间：
2015-10
影响因子：
4.1
通讯作者：
A. Trucco;Samuele Martelli;M. Crocco
中科院分区：
文献类型：
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作者：
A. Trucco;Samuele Martelli;M. Crocco
利用被动三维声纳系统对水下声源进行成像具有许多潜在的应用前景。然而，为了同时实现宽带宽和低成本，需要一种在低频下是超导性的和非周期的阵列，以避免在高频下的混叠。为了设计稀疏阵列布局和相关的滤波和波束形成器，应用了最近提出的一种用于机载声相机的方法。首先，将该方法推广到包含位置误差。然后，利用该方法证明了49个低成本、匹配不良的水听器足以构成边长为1m、工作频率从500 Hz到8.75 kHz的水声相机的正方形阵列。最后，通过对不同无源系统获得的模拟水声场景的图像进行比较，揭示了所提出的设计策略的优势。
The imaging of underwater acoustic sources using passive 3-D sonar systems has many potential applications. However, to achieve both wide bandwidth and low cost, an array that is superdirective at low frequencies and aperiodic, to avoid aliasing at high frequencies, is required. To design a sparse array layout and the related filter-and-sum beamformer, a recently proposed method for airborne acoustic cameras is applied. First, the method is generalized to include position errors. Next, the method is used to demonstrate that 49 low-cost, poorly matched hydrophones are sufficient to create a square array for an underwater acoustic camera working from 500 Hz to 8.75 kHz with a side length of 1 m. Finally, the images of a simulated acoustic scenario obtained using different passive systems are compared, which reveals the advantages of the proposed design strategy.