本文選題：雷達(dá)散射截面　切入點(diǎn)：散射中心　出處：《南京航空航天大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：目標(biāo)電磁散射特性的研究與分析一直是射頻仿真領(lǐng)域的重要研究?jī)?nèi)容之一,隨著高分辨率雷達(dá)技術(shù)的不斷發(fā)展與應(yīng)用,國(guó)內(nèi)外對(duì)復(fù)雜目標(biāo)的強(qiáng)散射源提取及分析越來(lái)越重視。通過(guò)對(duì)復(fù)雜目標(biāo)的散射中心模型進(jìn)行數(shù)值化提取,不僅有助于深入理解其復(fù)雜的電磁散射機(jī)制,而且在目標(biāo)識(shí)別及雷達(dá)目標(biāo)回波模擬系統(tǒng)中有著重要的作用。如何有效地獲取目標(biāo)電磁散射數(shù)據(jù)是散射中心技術(shù)研究的關(guān)鍵。本文以高頻電磁計(jì)算理論為基礎(chǔ),利用圖形電磁計(jì)算法預(yù)估電大尺寸目標(biāo)的雷達(dá)散射截面(RCS),討論了物理光學(xué)法(PO)、等效電磁流法(MEC)及物理繞射理論(PTD)等高頻計(jì)算方法及其建模的具體流程,其中包括復(fù)雜目標(biāo)的棱邊識(shí)別與模型渲染等關(guān)鍵技術(shù)。然后,給出了幾種典型目標(biāo)的點(diǎn)頻、寬帶RCS計(jì)算實(shí)例,并分析目標(biāo)寬帶RCS在高分辨率距離像(HRRP)中的應(yīng)用。在此基礎(chǔ)上,本文重點(diǎn)研究了基于幾何繞射理論(GTD)模型的雷達(dá)目標(biāo)散射中心提取方法,將狀態(tài)空間法(SSA)用于一維GTD模型的散射中心參數(shù)提取,并提出了一種散射類(lèi)型判斷的新方法,仿真結(jié)果表明此方法有良好的抗噪性能。為了將目標(biāo)散射中心拓展到二維平面上,本文利用二維增廣矩陣束法(2D-MEMP)及其修正法實(shí)現(xiàn)二維GTD模型的散射中心參數(shù)提取。相比于前者,修正后的方法針對(duì)二維位置參數(shù)的配對(duì)更為準(zhǔn)確。最后,研究了散射中心技術(shù)在RCS數(shù)據(jù)壓縮擬合中的應(yīng)用,以簡(jiǎn)潔的散射中心參數(shù)代替大量的電磁散射數(shù)據(jù)。各種仿真結(jié)果表明,基于本文研究的目標(biāo)特性建模及提取方法有較高的精度和應(yīng)用價(jià)值。
[Abstract]:The study and analysis of electromagnetic scattering characteristics of target has been one of the important research contents in the field of RF simulation. With the development and application of high resolution radar technology, More and more attention has been paid to the extraction and analysis of the strong scattering sources of complex targets at home and abroad. The numerical extraction of the scattering center model of complex targets is not only helpful to understand the complex electromagnetic scattering mechanism deeply. Moreover, it plays an important role in target recognition and radar target echo simulation system. How to obtain the target electromagnetic scattering data effectively is the key to the research of scattering center technology. This paper is based on the theory of high frequency electromagnetic calculation. In this paper, the radar scattering cross section (RCSC) of electrically large size targets is estimated by using the graphic electromagnetic calculation method. The high frequency calculation methods such as the physical optics method (POP), the equivalent electromagnetic current method (EEM) and the physical diffraction theory (PTD) are discussed. Some key techniques, such as edge recognition and model rendering of complex targets, are included. Then, examples of point frequency and wideband RCS calculation of typical targets are given, and the application of target wideband RCS in high resolution range profile (HRRP) is analyzed. In this paper, the method of radar target scattering center extraction based on geometric diffraction theory (GTD) model is studied. The state space method is used to extract the scattering center parameters of one-dimensional GTD model, and a new method to judge the scattering type is proposed. The simulation results show that this method has good anti-noise performance. In order to extend the scattering center of the target to the two-dimensional plane, the two-dimensional augmented matrix beam method (2D-MEMP) and its modified method are used to extract the scattering center parameters of the two-dimensional GTD model. The modified method is more accurate for the matching of two-dimensional position parameters. Finally, the application of scattering center technique in RCS data compression fitting is studied. A large number of electromagnetic scattering data are replaced by simple scattering center parameters. Various simulation results show that the modeling and extraction methods based on the target characteristics studied in this paper have high accuracy and application value.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TN957.52

【參考文獻(xiàn)】

相關(guān)博士學(xué)位論文 前1條

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本文編號(hào)：1611042