Abstract
A large two-dimensional (2-D) array is mandatory for underwater real-time three-dimensional (3-D) acoustical imaging. To reduce the hardware cost, we need to design sparse large 2-D arrays. In different bandwidths, the design methods should be different. In this chapter, the design methods are presented in narrowband, wideband, and ultrawideband (UWB) respectively. Currently, the most popular narrowband method of designing large 2-D arrays for underwater real-time 3-D imaging is based on simulated annealing. Unfortunately, designing wideband large 2-D arrays is generally limited by the high computational load of computing wideband beam pattern. A fast method of computing wideband beam pattern is introduced. Then, a wideband design example based on the fast method of computing wideband beam pattern is shown. This chapter also reveals that UWB ultrasparse 2-D arrays are promising for obtaining ultralow hardware cost with keeping the same imaging quality. Ultralarge UWB 2-D arrays can help achieve the high angular resolution 0.1° with low cost.
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Chi, C. (2019). Design of Underwater Large Sparse 2-D Arrays. In: Underwater Real-Time 3D Acoustical Imaging. Signals and Communication Technology. Springer, Singapore. https://doi.org/10.1007/978-981-13-3744-4_4
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DOI: https://doi.org/10.1007/978-981-13-3744-4_4
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