Effect of Non-unifrom Sampling on Sonar Focusing

Multireceiver synthetic aperture sonar (SAS) including multiple receivers often introduces the non-uniform sampling in the azimuth dimension. In this paper, we mainly discuss the influence of non-uniform sampling on the SAS imagery. The quality parameters of azimuth slice including azimuth resolution, peak sidelobe level ratio (PSLR) and integral sidelobe level ratio (ISLR) are used to quantitatively evaluate the imaging performance of non-uniform data. Based on our simulations, the non-uniform sampling can seriously degrade the imaging performance. In other words, the uniform sampling data should be first recovered before the SAS imagery.