Underwater Moving Target Imaging using Multistatic Inverse Synthetic Aperture Sonar (MISAS) with Virtual Resources

Underwater target imaging using acoustic waves is possible by employing the method used in synthetic aperture radars. In recent years، synthetic aperture sonar has been the subject of several researches. Wherein imaging of underwater moving target is required، inverse synthetic aperture sonar (ISAS) idea can be used but specifications and limitations of underwater channel should be considered. In this paper، first we survey monostatic inverse synthetic aperture sonar and its difficulties for use; then we propose multistatic inverse synthetic aperture sonar (MISAS) with specific geometry and condition which can create better images of underwater moving targets than monostatic ISAS. Improvement in images quality is achieved by space diversity of multistatic ISAS which is the result of placement and multipath effect of only one transmitter in shallow waters.