The research of underwater target imaging with high moving sonar based on synthetic aperture method

In the problem of space under-sampling in high speed synthetic aperture sonar (SAS), it is pointed out that SAS should be made up of a thin mapping strip involving the target and the hybrid SAS/ISAS method should be adopted to image the target according to its location and motion characteristics. This paper provides the approach of high pulse repetition frequency (PRF) with range ambiguity to increase space-sampling rate remarkably. Precise simulations in the presence of reverberation and noise prove its validity in real underwater surroundings. Consequently when the accumulated signal reverberation ratio (SRR) due to high PRF is reduced to affect imaging, the designs for further increasing the space sampling rate are investigated and compared to draw some significant conclusions. In a word the feasibility of underwater target imaging by high speed SAS is proved in this paper.