發(fā)布時(shí)間：2018-03-16 12:26

  本文選題：合成孔徑雷達(dá)　切入點(diǎn)：地面運(yùn)動(dòng)目標(biāo)檢測(cè)　出處：《國(guó)防科學(xué)技術(shù)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：多通道SAR-GMTI技術(shù)可以實(shí)現(xiàn)運(yùn)動(dòng)目標(biāo)檢測(cè)和高分辨雷達(dá)成像,具有重要的軍用和民用價(jià)值,是當(dāng)前SAR系統(tǒng)理論與應(yīng)用研究的熱點(diǎn)之一。本文對(duì)多通道SAR與時(shí)頻分析理論相結(jié)合實(shí)現(xiàn)運(yùn)動(dòng)目標(biāo)檢測(cè)和參數(shù)估計(jì)問(wèn)題作了比較深入的研究,所做的研究工作和取得的成果如下:(1)從靜止目標(biāo)回波模型出發(fā),構(gòu)建了運(yùn)動(dòng)目標(biāo)回波模型,深入分析了目標(biāo)運(yùn)動(dòng)對(duì)其成像產(chǎn)生的影響。針對(duì)運(yùn)動(dòng)目標(biāo)的回波特點(diǎn),介紹了利用分?jǐn)?shù)階傅里葉變換實(shí)現(xiàn)運(yùn)動(dòng)目標(biāo)參數(shù)估計(jì)的原理和實(shí)現(xiàn)方法;(2)詳細(xì)闡述了DPCA(Displaced Phase Center Antenna)和ATI(Along Track Interferometry)進(jìn)行運(yùn)動(dòng)目標(biāo)檢測(cè)的原理,分析了這兩種方法與分?jǐn)?shù)階傅里葉變換(Fractional Fourier Transform,FrFT)相結(jié)合實(shí)現(xiàn)參數(shù)估計(jì)的方法。針對(duì)已有的三通道方法在必須通過(guò)三個(gè)通道實(shí)現(xiàn)參數(shù)估計(jì)方面的局限,提出了改進(jìn)的雙通道DPCA-FrFT方法和改進(jìn)的雙通道DPCA-ATI-FrFT方法,理論和實(shí)驗(yàn)均表明這兩種改進(jìn)方法可以在所需通道數(shù)更少的情況下,實(shí)現(xiàn)很好的運(yùn)動(dòng)目標(biāo)檢測(cè)和參數(shù)估計(jì)。(3)在分析了空時(shí)自適應(yīng)處理(Space-Time Adaptive Processing,STAP)的基本原理基礎(chǔ)上,詳細(xì)闡述了多通道SAR-STAP方法,并推導(dǎo)了聯(lián)合FrFT實(shí)現(xiàn)參數(shù)估計(jì)的原理和方法。針對(duì)現(xiàn)有的多通道SAR-STAP運(yùn)算量大的問(wèn)題,提出了聯(lián)合低分辨率粗檢測(cè)和高分辨精細(xì)檢測(cè)兩個(gè)過(guò)程,改進(jìn)的運(yùn)動(dòng)目標(biāo)檢測(cè)的頻域STAP方法可以有效的減少計(jì)算量。
[Abstract]:Multi-channel SAR-GMTI technology can realize moving target detection and high-resolution radar imaging, which has important military and civilian value. It is one of the hotspots in the theory and application of SAR system. In this paper, the problem of moving target detection and parameter estimation based on multi-channel SAR and time-frequency analysis theory is studied deeply. The research work and the results obtained are as follows: 1) based on the echo model of moving target, the echo model of moving target is constructed, and the influence of target motion on its imaging is analyzed in depth. This paper introduces the principle and method of parameter estimation of moving object using fractional Fourier transform (FRT). The principle of moving target detection based on DPCA(Displaced Phase Center Antenna and ATI(Along Track interferometry is described in detail. This paper analyzes the two methods to realize parameter estimation by combining Fractional Fourier transform (FrFT) with Fractional Fourier transform (FrFT). In view of the limitations of the existing three-channel methods in realizing parameter estimation through three channels, The improved two-channel DPCA-FrFT method and the improved two-channel DPCA-ATI-FrFT method are proposed. The theoretical and experimental results show that the two improved methods can be used in the case of fewer channels. On the basis of analyzing the basic principle of space-time adaptive processing Space-Time Adaptive processing (STAP), the multi-channel SAR-STAP method is described in detail. The principle and method of parameter estimation based on joint FrFT are deduced. Aiming at the problem of large computation of multi-channel SAR-STAP, two processes of combined low resolution coarse detection and high resolution fine detection are proposed. The improved frequency-domain STAP method for moving target detection can effectively reduce the computational complexity.
【學(xué)位授予單位】：國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN957.52

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 鄧彬;秦玉亮;王宏強(qiáng);黎湘;;一種改進(jìn)的基于FrFT的SAR運(yùn)動(dòng)目標(biāo)檢測(cè)與成像方法[J];電子與信息學(xué)報(bào);2008年02期

2 周峰;李亞超;邢孟道;保錚;;一種單通道SAR地面運(yùn)動(dòng)目標(biāo)成像和運(yùn)動(dòng)參數(shù)估計(jì)方法[J];電子學(xué)報(bào);2007年03期

3 ;Research progress of the fractional Fourier transform in signal processing[J];Science in China(Series F:Information Sciences);2006年01期

相關(guān)博士學(xué)位論文 前5條

1 陽(yáng)召成;基于稀疏性的空時(shí)自適應(yīng)處理理論和方法[D];國(guó)防科學(xué)技術(shù)大學(xué);2013年

2 時(shí)公濤;基于干涉圖的多通道SAR地面慢動(dòng)目標(biāo)自動(dòng)檢測(cè)技術(shù)研究[D];國(guó)防科學(xué)技術(shù)大學(xué);2009年

3 常玉林;多通道低頻超寬帶SAR/GMTI系統(tǒng)長(zhǎng)相干積累STAP技術(shù)研究[D];國(guó)防科學(xué)技術(shù)大學(xué);2009年

4 孫華東;多通道SAR地面運(yùn)動(dòng)目標(biāo)檢測(cè)與參數(shù)估計(jì)研究[D];哈爾濱工業(yè)大學(xué);2009年

5 楊鳳鳳;星載雷達(dá)GMTI系統(tǒng)與信號(hào)處理研究[D];國(guó)防科學(xué)技術(shù)大學(xué);2007年

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本文編號(hào)：1619906