SAR高精细度欺骗干扰方法研究

发布时间：2018-03-17 09:42

本文选题：高分辨率SAR　切入点：散射中心模型　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着合成孔径雷达(SAR)的分辨率越来越高,SAR对信息获取的能力也越来越强。为了有效保护我方主要军事单位的保密性,迷惑对方的信息获取结果,对高分辨率SAR进行高精细度欺骗干扰具有重要的研究价值。现今的对欺骗干扰的研究,国内还主要停留在对点目标,以及用低分辨率目标散射分布进行欺骗干扰,难以达到对高分辨率SAR欺骗干扰的迷惑性和真实性要求。基于目标精细纹理特征的提取,对高精细度目标散射分布生成方法进行研究,以及基于高精细的特征生成欺骗干扰信号,是本文研究的主要内容。本文先通过仿真,分析了基本散射体在高频电磁波下的散射特性,在此基础上论证了两种散射中心模型的推导理论依据,对两种散射中心模型的参数意义和性能进行了分析。研究了基于两种散射中心模型的特征的提取原理及其性能,通过实验证明了散射中心模型及其特征提取方法的有效性,并以MSTAR典型复杂军事目标数据为对象,在目标分别进行理想散射中心和属性散射中心建模的基础上,对图像数据进行感兴趣区域提取,散射中心区域分割,通过对散射中心的参数估计,得到目标的散射中心特征向量组,作为SAR欺骗干扰目标的特征。对两种散射中心特征提取结果进行对比分析,说明其优缺点。基于散射中心特征提取的结果,对目标进行散射中心特征重构,分析重构目标与原目标的相似度。同时,基于同型号目标在邻近方位角下的散射中心特征,提出了一种未知角度下的目标特征拟合及重构方法。在两种散射中心模型重构图像的基础上,分别提出了适合两种模型的重构图像回波调制方法,并进行欺骗干扰的仿真实验。对欺骗干扰的结果,使用图像距离、相关性、几何特征等特征,以及干扰目标的散射中心特征再提取法,评估了干扰目标的相似度。最后应用目标识别系统,对干扰目标图像进行了识别。
[Abstract]:With the increasing resolution of synthetic Aperture Radar (SAR), SAR has become more and more capable of obtaining information. In order to effectively protect the confidentiality of our main military units and confuse the other side's information acquisition results, It is of great value to study high precision deception jamming in high resolution SAR. Nowadays, the research on deception jamming is mainly focused on the point target and the scattering distribution of low resolution target. It is difficult to meet the requirements of high resolution SAR spoofing jamming. Based on the extraction of fine texture features of the target, the scattering distribution generation method of high precision target is studied. The main content of this paper is to generate deceptive interference signals based on high precision features. Firstly, the scattering characteristics of basic scatterers under high frequency electromagnetic waves are analyzed by simulation. On this basis, the theoretical basis for the derivation of two scattering center models is demonstrated, the parameter significance and performance of the two scattering center models are analyzed, and the principle and performance of feature extraction based on the two scattering center models are studied. The effectiveness of the scattering center model and its feature extraction method is proved by experiments. Taking the MSTAR typical complex military target data as the object, the ideal scattering center and the attribute scattering center of the target are modeled, respectively. The region of interest is extracted from the image data, the scattering center region is segmented, and the characteristic vector group of the scattering center is obtained by estimating the parameters of the scattering center. As the feature of SAR spoofing jamming target, the feature extraction results of two scattering centers are compared and analyzed, and their advantages and disadvantages are illustrated. Based on the result of the feature extraction of scattering center, the scattering center feature of the target is reconstructed. The similarity between the reconstructed target and the original target is analyzed. At the same time, based on the scattering center characteristics of the same target in the adjacent azimuth, A method of target feature fitting and reconstruction at unknown angle is proposed. Based on the reconstruction of two scattering center models, the echo modulation methods suitable for the two models are proposed respectively. And the simulation experiment of deception jamming is carried out. For the result of deception jamming, the image distance, correlation, geometric features and the scattering center feature of the jamming target are extracted again. The similarity of jamming target is evaluated. Finally, the target image is recognized by using target recognition system.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN974

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