A Study on Synthetic Aperture Sonar Movement Compensation Based on Displaced Phase Center Algorithm

Movement compensation is the key technique in synthetic aperture sonar (SAS) imaging, and it is normally realized in SAS system by the cross correlation of the raw echo data of multiple-receiver. Based on the deep study of displaced phase center algorithm, an improved movement compensation algorithm for SAS is proposed. With this method, the difference between the actual path length and approximated path length using equivalent phase center is revised firstly, then movement error is estimated utilizing the time delay and phase error estimations. Through these ways the movement error scope that can be compensated is extended and the accuracy of movement error estimation is improved. Some simulation results are given in the end of this paper. It can be seen from these results that the improved algorithm compensates the movement error effectively and the imaging quality is enhanced.