層狀半空間及上方目標(biāo)復(fù)合散射的快速算法研究
[Abstract]:The study of composite scattering characteristics of half-space and upper targets has important theoretical significance and practical application value in microwave remote sensing radar imaging stealth and anti-stealth target detection and recognition. In the case of space-based radar observation, due to the interaction between the target and the background, the complex scattering characteristics of the target are very different from that of the target when it exists alone. In this paper, a fast algorithm for the calculation of composite electromagnetic scattering from layered half-space and above targets observed by space-based radar is studied systematically. In this paper, the influence of the background on the polarization characteristics of the reflected wave is introduced into the incident wave of the target scattering calculation over the layered half-space. When the observation point is far from the interface, the fast calculation of far-field radiation characteristics of arbitrarily oriented electromagnetic dipole over the half-space has been done. The main work and innovation of this paper are as follows: 1. Fast calculation of the radiation field in the far region of the electric and magnetic dipole with arbitrary orientation over the layered half-space. In view of the problem that the Green's function contains complex Sommerfeld integrals and is difficult to calculate in layered half-space, in this paper, when the observation point is far from the interface (in the case of space-based radar observation), the arbitrary electric orientation above the layered half-space is obtained by using reciprocity theorem. Analytical expression of radiation field in frequency domain of magnetic dipole. Furthermore, an analytical expression of the radiation field in frequency domain of an anisotropic layered half-space with arbitrary orientation is given. It lays a good foundation for the fast calculation of the electromagnetic characteristics of the target over half space. Analysis of polarization characteristics of reflected waves when linear polarized waves are incident into half space. In the previous analysis and calculation, the polarization characteristics of layered half-space reflected waves are often neglected compared with the polarization characteristics of incident waves. In this paper, the change of the polarization state of the reflected wave when the linear polarized wave is incident to the dielectric interface is systematically studied. The effects of the polarization angle of incident wave and the parameters of half-space medium on the polarization state of reflected wave are analyzed. The distribution of polarization state of reflected wave on Poincare sphere under different incident conditions is given and analyzed in detail. This part of the work provides a guarantee for the addition of incident wave in the calculation of electromagnetic scattering from a target over half space by using the semi-analytical method. A semi-analytical method for the calculation of electromagnetic properties of layered half-space and its upper target. In this paper, the semi-analytical method is used to calculate the electromagnetic scattering problem of layered half-space and its upper target, and a method to study the electromagnetic characteristics of the target above the half-space containing only the target itself is proposed. The effect of layered half-space is realized by the introduction of bi-directional incident wave (direct wave and interfacial reflection wave). Considering the difference in polarization state, electric field amplitude and phase between the reflected wave and the incident wave, the interfacial reflection wave is introduced into the calculation region by the principle of equivalence. In the transient field calculation, the incident wave and the reflected wave are introduced into the FDTD (Finite Difference Time Domain, finite-difference time-domain method with Fourier transform. Study on the coupling characteristics of target over half space under high power microwave irradiation. Using the above method, the near-field characteristics of the target when the high-power microwave is incident into the target under the condition of half-space are analyzed and discussed. When the incident condition is changed, the change of the energy coupling inside the target is analyzed and discussed.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2015
【分類號】:TN011
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