Research Of Underwater Target Echo Modeling And Parameter Estimation

Sonar target echo test and characterization has always been an important topic in the field of acoustic engineering,and relates to the development of the identification of targets and active stealth and target detection and other fields. The choice of incident wave and shallow marine environments and reverberation will affect the target test results. The establishment of echo model and the solution of model parameters are the basis to study the characteristics of the target, which is of great significance. This paper carries out concrete study on underwater target echo modeling and parameters .Firstly, the paper analyzes the influence of the key factors on the echo test, such as the choice of the sound field model, the choice of the test signal and the reverberation, and then focuses on the establishment of the target model and the solution of the model parameters.The paper chooses to use the method of fractional Fourier transform to solve the highlight model of target echo, and the simulation experiment is carried out to verify the feasibility and accuracy of the method. Then,the paper studies the unit impulse response model of the target.To solve the model parameters this paper uses the deconvolution, adaptive system identification, second-order cone programming method, and the performance effects of the above methods are compared and analyzed through simulation calculation of shallow water channel and water tank experiment. Simulation and pool test results show that using FRFT to solve the bright spot model and the second order cone programming model are suitable and feasible, and the results can be used for the study of target characteristics and the prediction of target echo waveform.