本文選題：欺騙干擾 + 統(tǒng)計(jì)模型��； 參考：《電子科技大學(xué)》2014年碩士論文

【摘要】：由于SAR系統(tǒng)的分辨率越來(lái)越高,在國(guó)防技術(shù)中的作用日益突出,為防止敵方雷達(dá)獲取我方重要信息,掌握戰(zhàn)場(chǎng)主動(dòng)權(quán),研究高相似度的SAR場(chǎng)景欺騙干擾顯得尤其重要。目前的SAR欺騙干擾生成的干擾信號(hào)相似度低,容易識(shí)別,很難達(dá)到干擾目的。因此,深入分析SAR圖像的紋理特征與散射特性,研究紋理與目標(biāo)結(jié)合的SAR場(chǎng)景欺騙干擾對(duì)于國(guó)防技術(shù)的現(xiàn)代化具有重要意義。本文首先介紹SAR的基本原理和欺騙干擾機(jī)理,分析了SAR圖像的特點(diǎn)以及基本特性,通過(guò)仿真實(shí)現(xiàn)了簡(jiǎn)單的欺騙干擾,比較并總結(jié)了欺騙干擾相對(duì)于其他干擾模式的優(yōu)點(diǎn)以及要實(shí)現(xiàn)欺騙干擾存在的難點(diǎn)。接著分析了SAR場(chǎng)景的統(tǒng)計(jì)分布特性,介紹幾種常見(jiàn)的統(tǒng)計(jì)分布模型,分析了統(tǒng)計(jì)模型的參數(shù)估計(jì)方法及檢驗(yàn)準(zhǔn)則,選取幾種典型的SAR場(chǎng)景進(jìn)行統(tǒng)計(jì)擬合實(shí)驗(yàn),得到不同場(chǎng)景的最佳統(tǒng)計(jì)模型,根據(jù)統(tǒng)計(jì)模型再現(xiàn)典型場(chǎng)景,證明統(tǒng)計(jì)特性不能有效表示高分辨SAR場(chǎng)景的細(xì)節(jié)特征。然后為了生成高相似度的虛假場(chǎng)景,基于SAR圖像的模型,論文研究了SAR圖像典型場(chǎng)景的紋理合成方法、散射中心模型及其參數(shù)估計(jì)方法。分別介紹了基于點(diǎn)的紋理合成方法和基于塊拼接的紋理合成方法,并通過(guò)仿真實(shí)現(xiàn)SAR場(chǎng)景的紋理合成。比較了兩種合成方法的效果,使用合成效果更好的塊拼接方法合成了SAR場(chǎng)景紋理�；趯傩陨⑸渲行哪Ｐ鸵约澳Ｐ偷膮�(shù)估計(jì)方法提取了典型目標(biāo)的散射中心,然后通過(guò)紋理與散射中心相結(jié)合提出一種SAR場(chǎng)景欺騙干擾方法,再根據(jù)欺騙干擾機(jī)理及相關(guān)成像算法,仿真實(shí)現(xiàn)了SAR場(chǎng)景欺騙干擾。本文最后研究了幾種典型參數(shù)誤差對(duì)于欺騙干擾效果的影響,通過(guò)理論分析及仿真實(shí)驗(yàn)得出結(jié)論:中心頻率誤差會(huì)使虛假目標(biāo)在距離向產(chǎn)生位置偏移;調(diào)頻斜率誤差會(huì)使虛假目標(biāo)散焦,主瓣展寬,主瓣峰值下降;多普勒斜率誤差以及平臺(tái)速度誤差會(huì)導(dǎo)致虛假目標(biāo)方位向產(chǎn)生位置偏移。同時(shí)研究了在一定指標(biāo)下成功實(shí)現(xiàn)干擾所允許的誤差范圍。
[Abstract]:Because the resolution of SAR system is getting higher and higher, and it is playing an increasingly important role in national defense technology, in order to prevent the enemy radar from acquiring our important information and master the battlefield initiative, it is particularly important to study the SAR scene deception jamming with high similarity. At present, the jamming signals generated by SAR deceptive jamming have low similarity and easy recognition, so it is difficult to achieve jamming purpose. Therefore, it is of great significance for the modernization of national defense technology to analyze the texture features and scattering characteristics of SAR images, and to study the SAR scene spoofing jamming combined with texture and target. This paper first introduces the basic principle of SAR and the mechanism of deception jamming, analyzes the characteristics and basic characteristics of SAR images, and realizes a simple deception jamming by simulation. The advantages of deception jamming compared with other jamming modes and the difficulties to implement deception jamming are compared and summarized. Then, the statistical distribution characteristics of SAR scene are analyzed, several common statistical distribution models are introduced, the parameter estimation methods and test criteria of the statistical model are analyzed, and several typical SAR scenes are selected for statistical fitting experiments. The optimal statistical model of different scenes is obtained and the typical scene is reproduced according to the statistical model. It is proved that the statistical characteristics can not effectively represent the detail features of high-resolution SAR scenes. Then, in order to generate false scene with high similarity, based on the model of SAR image, the texture synthesis method, scattering center model and parameter estimation method of typical scene in SAR image are studied in this paper. The point-based texture synthesis method and the block-based texture synthesis method are introduced, and the SAR scene texture synthesis is realized by simulation. The effects of the two synthetic methods are compared, and the SAR scene texture is synthesized by using the better block stitching method. Based on the attribute scattering center model and the parameter estimation method of the model, the scattering center of a typical target is extracted, and then a deception jamming method for SAR scene is proposed by combining the texture with the scattering center. Then, according to the deception jamming mechanism and the imaging algorithm, the SAR scene deception jamming is simulated. Finally, the influence of several typical parameter errors on the effect of deception jamming is studied. Through theoretical analysis and simulation experiments, it is concluded that the center frequency error will cause the false target to shift in the distance direction; The frequency modulation slope error will cause the false target to defocus, the main lobe will widen and the main lobe peak value will decrease, while the Doppler slope error and the platform velocity error will lead to the false target azimuth deviation. At the same time, the allowable error range of interference is studied under certain targets.
【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(lèi)號(hào)】：TN974

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本文編號(hào)：1993507