Upsampling Based Back Projection Imaging algorithm for Multi-receiver Synthetic Aperture Sonar

Abstract

In order to solve problems including the interpolation error, the distortion of phase information and the huge computational costs by using classical truncated-interpolation based back projection (BP) algorithm for multi-receiver synthetic aperture sonar (SAS), a novel BP algorithm is proposed by exploiting zero-padding in frequency domain, which is equivalent to interpolation in time domain. The presented algorithm firstly implements Fourier transform to echoed signal of each receiver, and then does the range cell migration correction (RCMC) considering the influence of the non "stop-and-hop" for each pixel in imaging scenario based on zero-padding in frequency domain and rounding in time domain. Finally, simulation and lake trial results further validate the performance of the proposed method.