Bionic Imaging of Underwater Multiple Targets with High Resolution Based on SCAT Model

The spectrogram correlation and transformation(SCAT) model, as the classic model in bat echo processing, has high range resolution. It is used to replace the artificial sonar for better underwater target location, which has become the developing trend of underwater acoustic detection. In this study, based on simple and reasonable assumptions, the range resolution of the SCAT model is strictly deduced, which is a reciprocal of 2 times the maximum center frequency of the filterbank. Then, a bionic imaging method of multiple targets with high resolution is proposed, which can be applied to a variety of imaging cases such as aeroacoustics, radar, and underwater as long as the model parameters are modified adaptively. Simulation results in underwater environment show that the bionic imaging method of multiple targets with high resolution can achieve underwater two-dimensional acoustic imaging with a higher range resolution than traditional correlator.