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The Large Caliber surface chamber containing the target electromagnetic scattering algorithm

Author: MengMin
Tutor: NieZaiPing
School: University of Electronic Science and Technology
Course: Electromagnetic Field and Microwave Technology
Keywords: The Large Caliber surface cavity - containing target Part of the coupling principle The generalized mixed field integral Multilevel fast multipole method High-order methods
CLC: TN011
Type: Master's thesis
Year: 2005
Downloads: 136
Quote: 2
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Large diameter surface containing cavity target scattering characteristics due to a strong engineering background, computing has increasingly become the focus of attention. The existing methods in the existing calculation conditions can not meet the demand of Large-diameter surface containing cavity target scattering properties. It is for this case the electric field integral equation combined with the part of the coupling principle to obtain the equivalent magnetic current caliber surface, using generalized mixed field integral equation methods to obtain the overall scattering characteristics of cavity-containing target, and combined with some acceleration the computing technical means to reduce the computational complexity, saving computing time, using high-order methods to reduce the unknown amount of memory savings. First, a brief review of some of the ways of solving the problem of the cavity containing cavity target decades. Such as containing cavity target as closed goal solving method, finite element method, the cavity cascade law. Are analyzed and compared, and pointed out its shortcomings and difficulties in the application. On this basis, this paper proposed new method for electrically large diameter surface containing cavity electromagnetic scattering the diameter surface magnetic flow requirements of solving the electric field integral equation methods combined partial coupling principle to obtain the equivalent magnetic current caliber surface. Then, through the combined field integral equation methods part of the coupling principle, seeking caliber surface magnetic current methods and a detailed description of the cavity cascade method, and compare the characteristics of these two methods, the cascade method in solving cavity containing cavity target within problem complexity and when the containing cavity goal is difficult Large-diameter surface; detailed and generalized mixed field integral equation methods. Then for this key technologies, such as multilevel fast multipole method, the impedance elements singular value approach, accelerated iterative means. In this paper, the multilevel fast multipole method to accelerate the moment vector multiplication, not only for the secondary current of solving also extend this method to solve for the integral of the electric field near field, upcoming multilevel fast multipole pole Original sub-method to the case of the presence of source sub-scattering weight aggregate extended scene does not overlap the general situation of the source sub-scattering body. Finally, in order to further reduce the amount of the unknown to save computing time and memory, the article also combined with high-order methods. High-level the method points also for high-end modeling and high-order basis functions. Were it makes detailed introduction. This article all numerical results are in good agreement with literature data and calculation of Large-diameter surface cavity-containing target full description of the proposed method with the multilevel fast multipole method expansion

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