A pulser receiver based synthetic aperture sonar.

摘要

Traditional sonar imaging is based upon pulse travel time, which determines the distance to objects. The sonar system can be modified to record both the amplitude and phase of echoes. With this modification, several echoes can be added together coherently to synthesize an apparently larger aperture compared to the size of actual transducer. This is called Synthetic Aperture Sonar (SAS). The significant advantage of this approach is that the range can be increased without compromising the azimuthal resolution. Difficulties in forming a SAS image arise due to the inaccurate knowledge of the system parameters. This thesis presents a method to determine unknown SAS system parameters and to produce a viable SAS system using a physical sonar transducer. The method for development of realistic simulated sonar signals is presented along with the procedure for obtaining the physical sonar signal. (Abstract shortened by UMI.)