【摘要】：本文的研究?jī)?nèi)容為金屬-等離子體組合目標(biāo)散射特性和極化匹配探測(cè)算法。金屬-等離子體組合目標(biāo)具有一定的隱身能力,是典型的低RCS目標(biāo),傳統(tǒng)雷達(dá)很難將其探測(cè)到。建立金屬-等離子體組合目標(biāo)在不同頻段、不同入射角、不同再入速度和不同極化入射波照射方式下的散射特性數(shù)據(jù)庫(kù),作為有用的先驗(yàn)信息,并在此基礎(chǔ)上選擇感興趣的頻段和入射角度,設(shè)計(jì)不同應(yīng)用背景下的極化匹配檢測(cè)器,可以顯著地提高雷達(dá)對(duì)金屬-等離子體組合目標(biāo)的探測(cè)能力。圍繞這一目標(biāo),本文開(kāi)展了以下主要工作:(1)建立了金屬-等離子體組合目標(biāo)分層模型,并運(yùn)用電磁計(jì)算軟件CST研究了金屬-等離子體組合目標(biāo)在不同頻段、不同再入速度、不同入射角度和不同極化的入射波照射下的散射特性。(2)在通道無(wú)約束情形下的雷達(dá)目標(biāo)回波極化信號(hào)增強(qiáng)方面,提出了“三步解耦”+迭代法,克服了傳統(tǒng)的搜索算法運(yùn)算量大,運(yùn)算時(shí)間長(zhǎng)的缺點(diǎn),可運(yùn)用于實(shí)時(shí)雷達(dá)系統(tǒng)。(3)引入了信雜噪比模型,提出了轉(zhuǎn)化+迭代法,將同極化通道情形和通道無(wú)約束情形下功率對(duì)比度最優(yōu)極化方式求解問(wèn)題轉(zhuǎn)化為功率最大化最優(yōu)極化方式求解問(wèn)題,再運(yùn)用拉格朗日乘數(shù)法和“三步解耦”+迭代法求解最優(yōu)極化方式,算法運(yùn)算量小、計(jì)算時(shí)間少、且穩(wěn)定性好。(4)針對(duì)部分均勻環(huán)境下,研究了MSD檢測(cè)器和ASD檢測(cè)器的檢測(cè)性能和恒虛警特性,分析了檢測(cè)器的檢測(cè)性能與輔助數(shù)據(jù)量的關(guān)系,并且在極化域優(yōu)化了檢測(cè)器性能。
[Abstract]:The research content of this paper is the scattering characteristics of metal-plasma combined targets and polarization matching detection algorithm. Metal-plasma combined target has certain stealth ability and is a typical low RCS target, which is difficult to detect by traditional radar. The database of scattering characteristics of metal-plasma combined targets in different frequency bands, different incident angles, different reentry speeds and different polarization incident waves is established as useful prior information. On this basis, the frequency band and incident angle of interest are selected, and the polarization matching detector under different application background is designed, which can significantly improve the detection ability of radar to metal-plasma combined targets. Around this goal, the main work of this paper is as follows: (1) the layered model of metal-plasma combination target is established, and the metal-plasma combination target in different frequency bands is studied by using the electromagnetic calculation software CST. The scattering characteristics of radar target echo polarization signal with different reentry velocity, different incident angle and different polarization. (2) in the aspect of radar target echo polarization signal enhancement under the condition of unconstrained channel, a "three-step decoupling" iterative method is proposed. Overcome the shortcomings of the traditional search algorithm, such as large computation and long operation time, and can be used in real-time radar system. (3) the signal-to-noise ratio (SNR) model is introduced, and the transformation iteration method is proposed. The problem of optimal polarization mode of power contrast in the case of same polarization channel and unconstrained channel is transformed into the problem of optimal polarization mode of power maximization. Then the Lagrangian multiplier method and the "three-step decoupling" iterative method are used to solve the optimal polarization mode. the algorithm has the advantages of small amount of operation, less calculation time and good stability. (4) for partially uniform environment, The detection performance and constant false alarm characteristics of MSD detector and ASD detector are studied, the relationship between the detection performance of the detector and the auxiliary data volume is analyzed, and the performance of the detector is optimized in the polarization domain.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN95

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本文編號(hào)：2495866