Synthetic aperture sonar (SAS) imaging is a worldwide high-tech. Because the high bearing resolution of SAS is based on a very large virtual aperture through array motion, the computation load for real-time processing is very heavy, especially the memory capacity requirement is a bottle-neck for the processing. A new null-deposit twin-pipeline parallel processing algorithm for aperture synthesis is proposed in this paper. A wide-band low-frequency SAS trial along with the result of the real-time target contour imaging is also presented. The results show that the new parallel processing algorithm and target contour imaging are practicable for real-time processing of SAS.
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