Study of acoustic tomography to Circular synthetic aperture sonar imaging

Abstract

Acoustic tomography can provide a two-dimensional cross-sectional view of real object through processing of many projections taken at different directions. This technique can insonifing the object and then recording the backscattered signal provides the projection information for a given aspect angle. Circular synthetic aperture sonar can combine object backscattered echoes in a circular trajectory during many aspect angles which to yield high-resolution image by tomographic. The aspect angles backscattered signals are obtained by experiment with benchmark moving in a circle. The two-dimensional shape of benchmark is reconstructed by applying Fourier reconstruction method, Backprojection method and Filtered backprojection method. The results show that both reconstruction images reveal the radially symmetric shape of the benchmark but the prominence of the acoustic highlights is different. The Fourier reconstruction method is preferred for acoustic image formation due to its efficiency and reconstruction accuracy.