等離子體時(shí)域有限差分方法及再入等離子體涂覆目標(biāo)電磁特性研究
[Abstract]:In this paper, the finite difference time domain method of plasma medium is studied, the finite difference time domain numerical method of ladder recurrent convolution (TRC-FDTD) is deduced in detail under the condition of magnetization and unmagnetization, and the reentry vehicle is modeled. The electromagnetic characteristics of typical targets coated with reentry plasma medium and reentry obtuse cone are analyzed. The main work of this paper is as follows: 1. By using Maxwell equations and related equations, combined with the theory of ladder recurrent convolution, and the method of discrete processing proposed by Yee, The finite difference time domain method (TRC-FDTD) of ladder recurrent convolution in unmagnetized plasma media is deduced in detail. The correctness and effectiveness of the method are verified by the corresponding examples. 2. The finite difference time domain method (TRC-FDTD) of magnetized plasma ladder Recursive convolution is studied, and the interaction between polarized electromagnetic wave and magnetized cold plasma with different incident angle is studied. When the propagation direction of electromagnetic wave is parallel to the direction of magnetic field, the related electromagnetic characteristic parameters of left-handed polarization wave and right-handed polarization wave are calculated respectively. in a certain frequency domain, the incident angle increases and the reflection coefficient increases. When the propagation direction of electromagnetic wave is perpendicular to the direction of magnetic field, the unusual waves and ordinary waves are analyzed and discussed, and the cutoff frequency is also discussed. The blunt cone model of reentry flight body is established, and the reentry plasma flow field is obtained by computational fluid dynamics (CFD). Through TRC-FDTD algorithm, the electromagnetic characteristics of electromagnetic wave passing through the reentry plasma plate are discussed, and the effects of reference point position, reentry velocity, reentry height and plasma coating thickness on the electromagnetic scattering characteristics are analyzed. The typical targets with different shapes coated with magnetized and unmagnetized reentry plasma media and the radar cross section (RCS), of reentry obtuse cone are studied. the position of reference point, reentry velocity, reentry height and cyclotron frequency are discussed. It is found that the change of RCS of different targets is greatly affected by the change of plasma coating thickness and other parameters.
【學(xué)位授予單位】:南昌大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TN011
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