Processing of non-uniform azimuth sampling in multiple-receiver Synthetic aperture sonar image

Multiple-receiver synthetic aperture sonar (SAS) imaging with Displaced Phase Center (DPC) technique can solve the confliction between mapping speed and resolution, but this mode brings some phase error and restricts the selection of velocity of the SAS carrier and the pulse repetition frequency (PRF), namely, the SAS carrier velocity has to be chosen such that the SAS carrier moves just one half of its antenna length in a pulse repetition interval. Any deviated from this ideal velocity will result in a non-uniform sampling of synthetic aperture. In this paper, phase errors of multi-receiver can be compensated approximately and signal model can be obtained, and then, the reconstruction method of uniform spectrum in azimuth is given when the SAS carrier velocity deviated from the ideal one. The simulation and trial results show the validity of this method.