| Since the 21 st century,China's aerospace technology has achieved rapid development,and major military powers have also strengthened the militarization of space.In order to compete for space resources,major military powers have increased their research and development of space weapons.Electromagnetic pulse(EMP)weapons,as one of the important directed energy weapons in electronic warfare,have a wide frequency band,wide range of functions and strong damage capability.Such characteristics have made it necessary for governments to focus on strengthening the protection of electromagnetic pulses by electronic and electrical equipment.As an important power supply system for satellites,solar panels provide continuous and stable electrical energy for aerospace equipment.As a full-wave time domain algorithm,the time domain finite difference method(FDTD)is widely used in various fields because of its advantages of easy implementation and natural parallelism.However,due to the defects of the traditional time domain finite difference method,the numerical results of the calculations are not accurate enough.In order to solve this problem,based on the high-order FDTD algorithm,this paper improves the near-far field extrapolation technique of the time-harmonic field and improves the computational accuracy of the algorithm.In this paper,the high-order FDTD algorithm is used to analyze the influence of high power electromagnetic pulse on the solar power supply system from different aspects,and some feasible suggestions for high power electromagnetic pulse protection are given.Firstly,the iterative formula of the traditional FDTD algorithm is derived,and the formula for calculating the electromagnetic field component in the perfectly matched layer(PML)is derived in detail.The Pade approximation is used to improve the transcendental function in the PML dielectric layer.This method unifies the iteration formula of the whole calculation area,and greatly simplifies the programming calculation.Secondly,the FDTD algorithm is used to calculate the electromagnetic scattering of the target.A plane wave is introduced at the boundary of the total field,and the boundary conditions of the total field are given.In the calculation of scattering characteristics,the near-far field extrapolation technique of time harmonic field is deduced in detail.The correctness of the program is verified by two numerical examples.Then,in order to improve the calculation accuracy of FDTD,the high-order FDTD algorithm is studied.The iterative formula of high-order FDTD(2,4)algorithm is deduced in detail.The iteration coefficients and total field boundary conditions of PML layer in high-order FDTD algorithm are modified.The recursive polynomial interpolation method is used to improve the near-far field extrapolation in high-order FDTD algorithm,which improves the calculation accuracy.By using the traditional FDTD algorithm and the high-order FDTD algorithm,the results of the scattering calculation examples are compared with the commercial electromagnetic simulation software CST.The correctness and effectiveness of the algorithm are verified.Finally,the influence of electromagnetic pulse on solar power supply system is analyzed by high-order FDTD algorithm.The coupling electric field at different reference points of the unit crystal silicon panel,the four-unit solar panel and the eight-unit solar panel,under different incident directions,different polarization forms and different rising edge time of EMP signal,is obtained by calculation,coupled magnetic field,coupled current,and far-field E-plane radar cross section(RCS),and the analysis of the results provides some reference and feasible suggestions for the high-power electromagnetic pulse protection of solar power supply systems.Finally,the Open MP technology based on shared memory parallel mode is studied.The parallel computing of FDTD algorithm is carried out,which improves the computational efficiency of the algorithm. |
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