Study On Polarimetric Electromagnetic Scattering Simulation Of Scene Based On GRECO

The electromagnetic characteristics of radar target represent the inherent physical characteristics of target,including geometry,structure and material information.Generally speaking,the electromagnetic characteristics of radar targets include scattering center characteristics and polarization characteristics.The scattering center characteristics can accurately describe the target electromagnetic scattering characteristics and the fine physical structure of the target.And,the polarization information of the radar target can invert the target structure,material,shape,attitude orientation and so on.The combination of polarization characteristics and scattering center characteristics of the electromagnetic characteristics can describe the structure and scattering characteristics of the target,and improve the comprehensibility of the radar image.Electromagnetic scattering characteristics can be obtained in two ways: measurement and simulation.It is necessary to consume a large amount of manpower and material resources through the actual measurement.So,on the basis of electromagnetic scattering theory,the simulation data obtained by computer is an important method to study the characteristics of electromagnetic scattering.Electromagnetic simulation has become a major way to analyze target scattering characteristics.Numerical methods and high-frequency methods are two commonly used methods in the analysis of target electromagnetic properties.Traditional Graphical Electromagnetic Computing(GRECO)algorithm can quickly calculate the radar cross section(RCS)of the target and is widely used to compute electromagnetic scattering properties of electrically large objects.However,RCS only reflects the amplitude of scattering characteristics of a target.In order to obtain polarimetric information of a target,this paper presents a new approach called Pol-GRECO in which scattering matrix is used to characterize the polarized electromagnetic scattering characteristics of a target,and the relationship between polarized scattering matrix and RCS is derived in theory.Using the computer graphics theory to obtain the parameters needed for simulation and the polarization scattering matrix is simulated by physical optics with these parameters.In addition,combined with the method of preprocessing screen,the scope of simulation is expanded.Considering the situation in simulation of the double-scattering,Minimum-Angle method,geometrical optics(GO)method and equivalent principle of single-double station is employed to compute the polarized double-scattering to improve the precision of simulation.Finally,simple polarized scattering model that has analytical solutions as well as a typical artificial target are used to verify the correctness of Pol-GRECO method,and the polarized electromagnetic scattering characteristics of typical artificial targets and typical backgrounds are simulated with this method.Experimental results show that,the method of polarized electromagnetic scattering is studied to realize the simulation of fast polarization scattering of target or background.The traditional GRECO algorithm for target RCS simulation is extended to the simulation of the polarized scattering matrix for the scene,and the combination of the split-screen processing steps,double-scattering calculation,and the simulation accuracy of the algorithm is mentioned in the comprehensive consideration of the number of simulation parameters and the simulation situation.