Matched image processing for undersampled synthetic aperture sonar

An approach conceptually similar to matched field processing that mitigates the effects of aliasing in undersampled synthetic aperture sonar images is presented. This pattern matching technique is performed in the complex image domain and reduces the strength of the aliases by cross-correlating replica sub-images with an aliased undersampled synthetic aperture sonar image. The issue of mitigating multipath effects is not addressed but matched image processing could be combined with a more conventional range/depth matched field processing algorithm to achieve even greater image improvements in multipath environments.