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Motion feature is of great significance for blob targets recognition,behavior analysis and threat estimation in active sonar echographs. Hence, itis desirable to access the space-time variation of echo intensity on eachspatial-temporal resolution cell from the sonar echographs sequence. Then thesubtle motion information of the potential blob targets can be accuratelycharacterized. This idea has been conduced in optical image sequences bysolving an motion optical flow field (MOFF) function. Nonetheless, due to thesparkle of the sonar echograph sequences, and strong interferences caused bywake and cavitation noise of fast-moving ship in harbor environments, theconstraints underlying the traditional motion optical flow function that iscouples the brightness constancy constant along time dimension of each echointensity points and the motion field spatial smoothness does not hold in ourcase. Hence, this paper presents a new motion acoustic flow field (MAFF)function and its solving strategy to accurately characterize the subtle motioninformation of blob targets in active sonar echographs of harbor environments.Experiments on a series of cooperative targets in real-world harborenvironments demonstrate the efficacy of our proposed MAFF.

Motion Acoustic Flow Field: Motion Estimation for Blob Targets in Active Sonar Echograph of Harbor Environments