Synthetic aperture active sonar imaging

The main problems involved in synthetic aperture sonar imaging are medium instability, slow mapping rate, and platform motion. Proposed solutions to these problems are reviewed, and a new technique for synthetic aperture sonar imaging is presented which allows a fast mapping rate and improved motion compensation. This technique involves using multiple receivers to form a complex-valued preliminary image for each pulse. The preliminary images are used to estimate translation and rotation, and then they are registered, phase corrected, and superimposed to form high-resolution synthetic aperture sonar images