Abstract
Conventional beamforming is widely used in underwater three-dimensional (3D) acoustical imaging. However, the imaging quality of the conventional beamforming is limited, because of the limited capability of angular resolution and high sidelobe levels of conventional beamforming. This paper proposes to apply a deconvolution method based on the Fourier-based nonnegative least-squares algorithm to underwater 3D imaging, to improve the imaging quality. Experiment shows that the deconvolution method improves the angular resolution by two times and decreases sidelobe levels by more than 10dB for the 3D imaging sonar, compared to the conventional beamforming.
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