Phased subarray processing for underwater 3D acoustic imaging

摘要: 3D sonar imaging using a fully-populated rectangular 2D array has many promising applications for underwater imaging. A primary limitation of such systems is the large number parallel front-end hardware channels needed to process signals in transmit and receive when conventional full phased subaperture beam acquisition image formation presented that significantly reduces while achieving quality approaching Rather than transmitting receiving on all N/spl times/N transducer elements form each beam, an M/spl times/M subset - called subarray used firing. The limited processing are acquire data from subarray. Switching allows be multiplexed across array. Due Nyquist sampling criteria beamspace, beams acquired by can reduced compared required includes upsampling, lateral interpolation with subarray-dependent filter, coherent weighting summation images high resolution image. method achieves nearing fewer channels, slightly SNR, roughly three times firings reasonable configurations.