SAR Image Modeling And Simulation Of Ship Target

In the study of Synthetic Aperture Radar(SAR)imaging simulation,electromagnetic simulation due to its huge advantage relative to external reality experiment and Study on microwave darkroom experiment of low cost,convenient operation,high safety aspects,and thus become a hot research topic of many researchers.With the development of marine strategy in the world,it is of great practical significance to study the modeling and electromagnetic simulation of sea surface ship based on SAR.Aiming at the problem of electromagnetic simulation in the application of SAR to sea observation,the research contents of this paper are as follows:1.Based on the analysis of the geometric structure of the ship,the three-dimensional model of the ship target is established by the solid modeling method.2.Based on the analysis of the characteristics of several kinds of electromagnetic calculation methods,the large element PO(LE-PO),which has high speed,high precision and relatively reasonable computer memory requirement,is used to simulate the electromagnetic calculation.3.According to the characteristics of the sea surface and sea surface motion,the Doppler spectrum characteristics of the linear time-varying sea surface backscatter signal are studied,and the influence of ocean parameters on the Doppler broadening and frequency shift is analyzed.4.According to the motion characteristics of six degrees of freedom,the influence of sea spectrum model and orientation distribution function on ship motion characteristics is analyzed.Based on the fusion of the sea surface and the ship,the model of the ship target motion is established.Using the electromagnetic simulation software,this paper studies the modulation mechanism of the electromagnetic scattering from the ship targets in the time-varying sea surface,and gives the SAR image of the echo data.The results show that the electromagnetic simulation technology has a clear simulation image.The advantages of electromagnetic simulation in cost and accuracy can be greatly improved.