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

【摘要】：由于SAR系統(tǒng)的分辨率越來越高,在國防技術中的作用日益突出,為防止敵方雷達獲取我方重要信息,掌握戰(zhàn)場主動權,研究高相似度的SAR場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相似度低,容易識別,很難達到干擾目的。因此,深入分析SAR圖像的紋理特征與散射特性,研究紋理與目標結合的SAR場景欺騙干擾對于國防技術的現(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理,分析了SAR圖像的特點以及基本特性,通過仿真實現(xiàn)了簡單的欺騙干擾,比較并總結了欺騙干擾相對于其他干擾模式的優(yōu)點以及要實現(xiàn)欺騙干擾存在的難點。接著分析了SAR場景的統(tǒng)計分布特性,介紹幾種常見的統(tǒng)計分布模型,分析了統(tǒng)計模型的參數估計方法及檢驗準則,選取幾種典型的SAR場景進行統(tǒng)計擬合實驗,得到不同場景的最佳統(tǒng)計模型,根據統(tǒng)計模型再現(xiàn)典型場景,證明統(tǒng)計特性不能有效表示高分辨SAR場景的細節(jié)特征。然后為了生成高相似度的虛假場景,基于SAR圖像的模型,論文研究了SAR圖像典型場景的紋理合成方法、散射中心模型及其參數估計方法。分別介紹了基于點的紋理合成方法和基于塊拼接的紋理合成方法,并通過仿真實現(xiàn)SAR場景的紋理合成。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場景紋理�；趯傩陨⑸渲行哪Ｐ鸵约澳Ｐ偷膮倒烙嫹椒ㄌ崛×说湫湍繕说纳⑸渲行�,然后通過紋理與散射中心相結合提出一種SAR場景欺騙干擾方法,再根據欺騙干擾機理及相關成像算法,仿真實現(xiàn)了SAR場景欺騙干擾。本文最后研究了幾種典型參數誤差對于欺騙干擾效果的影響,通過理論分析及仿真實驗得出結論:中心頻率誤差會使虛假目標在距離向產生位置偏移;調頻斜率誤差會使虛假目標散焦,主瓣展寬,主瓣峰值下降;多普勒斜率誤差以及平臺速度誤差會導致虛假目標方位向產生位置偏移。同時研究了在一定指標下成功實現(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.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN974

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本文編號：1993507