Underwater 3D imaging by FFT dynamic focusing beamforming

Describes an application of the dynamic focusing technique for underwater 3D acoustic imaging. In particular, the integration of dynamic focalization with an FFT implementation of phase-shift beamforming has been developed in order to avoid an increase in computational complexity. The resulting system, which uses narrow-band signals, permits the formation of 3D images at a high frame rate and without the limitations imposed by the depth of field on fixed-focused beamforming. Some simulations made it possible to test the proposed system, and the related results are reported