Filtered Back Projection Imaging in Multistatic Inverse Synthetic Aperture Sonar

Underwater target imaging is possible using inverse synthetic aperture sonar but there are some practical difficulties because of inverse synthetic aperture geometry and underwater acoustic conditions. This paper proposes Multistatic Inverse Synthetic Aperture Sonar (MISAS) in shallow water, which can create better images of underwater moving targets. For finding an appropriate algorithm, imaging equations are derived for MISAS using polar format and filtered back projection algorithms. After simulation of both methods, it is shown that proposed filtered back projection algorithm has better performance due to picture quality criteria and target distance independence.