本文選題：高階阻抗邊界條件 + 涂敷目標(biāo)　； 參考：《南京理工大學(xué)》2017年碩士論文

【摘要】：涂敷目標(biāo)的電磁散射分析在實(shí)際應(yīng)用中具有十分重要的意義,尤其在雷達(dá)隱身和反隱身、雷達(dá)識(shí)別和反識(shí)別、精密制導(dǎo)及仿真技術(shù)領(lǐng)域起著極其重要的作用。因此如何準(zhǔn)確、快速地分析涂敷目標(biāo)的電磁特性,長(zhǎng)期以來(lái)一直是計(jì)算電磁學(xué)領(lǐng)域的研究重點(diǎn)。為此,本文開(kāi)展了對(duì)于涂敷目標(biāo)電磁散射分析中的高效求解方法的研究。阻抗邊界條件通過(guò)建立涂敷目標(biāo)外表面上切向電場(chǎng)與切向磁場(chǎng)的關(guān)系,再與邊界積分方程聯(lián)立求解得到表面等效電磁流,為分析涂敷目標(biāo)的散射特性提供了簡(jiǎn)捷而有效的計(jì)算方法。本文以涂敷目標(biāo)的散射問(wèn)題和高階阻抗邊界條件為研究對(duì)象,做了以下幾方面的工作:首先,介紹了涂敷目標(biāo)電磁散射分析主要的積分方程方法,分析了它們的優(yōu)勢(shì)以及局限性;其次,著重介紹了高階阻抗邊界條件理論,推導(dǎo)出高階阻抗邊界條件表達(dá)式,并具體探討了高階阻抗邊界條件與頻域積分方程方法相結(jié)合的數(shù)值實(shí)現(xiàn)過(guò)程,并在實(shí)現(xiàn)過(guò)程中針對(duì)高階阻抗邊界條件中的高階偏微分項(xiàng)進(jìn)行了簡(jiǎn)化處理,并給出數(shù)值算例驗(yàn)證了該方法的正確性和實(shí)用性;最后,介紹了利用高階阻抗邊界條件結(jié)合時(shí)域積分方程分析涂敷目標(biāo)的電磁散射特性,詳細(xì)推導(dǎo)了時(shí)間步進(jìn)算法用于求解基于高階阻抗邊界條件的時(shí)域積分方程的具體步驟,包括采用矢量匹配法結(jié)合遞歸卷積處理時(shí)域高階阻抗邊界條件得到涂敷目標(biāo)表面切向電場(chǎng)和表面電流之間遞推關(guān)系。數(shù)值算例驗(yàn)證了該方法的正確性與穩(wěn)定性。
[Abstract]:Electromagnetic scattering analysis of coated targets is of great significance in practical applications, especially in the fields of radar stealth and anti-stealth, radar recognition and anti-recognition, precision guidance and simulation technology. Therefore, how to accurately and quickly analyze the electromagnetic characteristics of coated targets has been the focus of computational electromagnetics for a long time. Therefore, an efficient method for solving the electromagnetic scattering analysis of coated targets is studied in this paper. By establishing the relationship between the tangential electric field and the tangential magnetic field on the outer surface of the coated target, the impedance boundary condition is solved in conjunction with the boundary integral equation to obtain the surface equivalent electromagnetic current. It provides a simple and effective method for analyzing the scattering characteristics of coated targets. In this paper, the scattering problem of coated targets and the high order impedance boundary conditions are studied. The following works are done: firstly, the main integral equation methods for electromagnetic scattering analysis of coated targets are introduced. Their advantages and limitations are analyzed. Secondly, the theory of high order impedance boundary conditions is introduced, and the expression of high order impedance boundary conditions is derived. The numerical realization of the combination of high-order impedance boundary condition and frequency-domain integral equation method is discussed, and the high-order partial differential term in the high-order impedance boundary condition is simplified. Numerical examples are given to verify the correctness and practicability of the method. Finally, the electromagnetic scattering characteristics of coated targets are analyzed by using high-order impedance boundary conditions and time-domain integral equations. The specific steps of time-domain integral equation based on high-order impedance boundary condition are derived in detail. The recursive relationship between the tangential electric field and the surface current of the coated target surface is obtained by using the vector matching method combined with recursive convolution to deal with the high order impedance boundary conditions in time domain. Numerical examples verify the correctness and stability of the method.
【學(xué)位授予單位】：南京理工大學(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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本文編號(hào)：1924713