Research On Scattering Characteristics Simulation Of Typical Target Based On Unconditionally Stable WLP-FDTD

The correct extraction of radar target scattering characteristics is of great significance for target recognition.Due to the limitation of experimental conditions and the rapid development of computer technology,electromagnetic calculation has become an important simulation method of scattering characteristics,but most electromagnetic calculation methods are difficult to take into account the calculation accuracy and computational efficiency.The finite difference time domain method(WLP-FDTD)based on the weighted laguerre polynomial is a recently developed electromagnetic calculation method that can take into account both accuracy and efficiency,However,there is still a lack of relevant research on using it to simulate scattering characteristics.Firstly,the basic principle of WLP-FDTD method is introduced.Based on the basic properties of laguerre polynomials and Maxwell’s equations,the basic equations of the traditional WLP-FDTD method are given,and the selection method of key parameters is introduced.Based on the disadvantage that the traditional WLP-FDTD method will occupy a lot of memory when simulating 3D electromagnetic problems,two efficient WLP-FDTD algorithms — Duan’s efficient WLP-FDTD and Chen’s efficient WLP-FDTD that are more suitable for3 D simulation are introduced,and their basic equations when simulating complex targets are given;finally,the error characteristics of these two efficient algorithms are introduced respectively,and their different applicable scenarios are explained.Then supplement and improve the relevant theories for simulating the scattering characteristics of 3D complex targets using the Duan’s efficient WLP-FDTD method and the Chen’s efficient WLP-FDTD method.First,in order to accurately calculate the scattered field of the target,this paper deduces the pure scattered field update equation of the efficient WLP-FDTD method according to the total field decomposition theory.Then,in order to eliminate the false reflection of the simulation boundary,the CPML absorption boundary condition of the high-efficiency WLP-FDTD method is proposed.Finally,the calculation process of RCS and echo is modified to improve the simulation efficiency.Finally,the scattering characteristics of typical targets are simulated and verified using the improved Duan’s efficient WLP-FDTD and Chen’s efficient WLP-FDTD methods.By analyzing the simulation results of metal sphere,plate,trihedral and aircraft model,it is proved that the improved Duan’s efficient WLP-FDTD method and Chen’s efficient WLP-FDTD method have higher simulation efficiency than the traditional FDTD method while maintaining similar accuracy.,which verifies that the methods in this paper can meet the requirements of this topic for high-precision and high-efficiency simulation of typical target scattering characteristics.