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基于高分辨距离像的雷达自动目标识别研究
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摘要
由宽带雷达获取的高分辨距离像(HRRP)反映了目标散射中心沿雷达视线的分布情况,包含了更多有关目标的结构和形状信息,相比雷达二维像和三维像而言易于获取,并且可实现实时识别。因此,基于HRRP的目标识别方法是当前识别飞机等高速运动目标的有效手段。
     本论文围绕国家十一五总装预研项目,针对空中飞机目标,对高分辨距离像雷达目标识别系统中的特征提取和选择、分类器设计及非库属目标拒识等相关问题展开研究。论文主要工作如下:
     1.为了充分利用HRRP中包含的目标结构和形状信息,提出了自适应差分算法,有效地提取了目标在雷达视线上的投影长度特征,实现了对目标的预分类。
     2.针对经典子空间方法中多目标分类边界模糊的问题,研究了加权的一对一分类(WOAO)策略,通过为每个分类器设置分类效果权值,解决了常规一对一(OAO)分类方法中多个目标因得票相同而出现的分类模糊问题。
     3.从信息融合的角度出发,提出融合长度特征和子空间特征的多级组合分类器识别方案,利用长度特征进行预分类,缩小WOAO分类算法的搜索范围,提高识别率。
     4.在利用经典Relief算法对距离像进行特征选择时,若目标在某维特征上分布不均匀,则会出现对该维特征的分类有效性评估不准确的问题,为此提出了改进的MRe特征选择算法,通过加大每对成功分类的样本对在权值累积时所占的比重,解决了目标分布不均匀对特征权值的影响,使得选择出的特征更有利于目标分类。
     5.针对目标识别系统中非库属目标的拒识问题,研究了一种改进的广义置信度函数,通过为每类目标设置拒识门限,实现对非库属目标的可靠判别。
     6.以仿生模式识别理论为基础,提出一种链条覆盖模型拒识算法。该算法为目标样本在特征空间的分布构建紧凑的封闭几何边界,以此边界来代表目标样本分布形状,通过判断测试样本是否位于目标覆盖边界内来实现对样本的拒识。
     上述所有算法的性能均在仿真及实测飞机目标数据上得到了验证。
The high resolution range profile (HRRP) obtained from wideband radar reflectsthe distribution of the target scattering centers along the radar line of sight, whichcontains more information about the structure and shape of the target. Compared withtwo-dimensional or three-dimensional radar imagery, HRRP is easier to be captured.Besides, real-time recognition can be realized. Therefore, the target recognition basedon HRRP is currently an effective approach to identifying airplanes and otherhigh-speed moving targets.
     This dissertation which is supported by the pre-research projects of GeneralArmament Department of the Eleventh Five-Year Plan, studies feature extraction andselection, classifier design and out-of-database target rejection of HRRP radar automatictarget recognition system, based on the target aircraft recognition. The main content andinnovation is summarized as follows:
     1. To make full use of the information of target structure and shape included inHRRP, an adaptive difference operator is proposed to extract the target projection lengthalong the radar line of sight, and the targets are rough classified according to the lengthfeature.
     2. In view of the vague borderline in multi-target classification of classicalsubspace method, we studies a weighted one against one (WOAO) classified strategies.By set weight for each classifier, this method solves the vague classification problem ofthe norm one against one (OAO) classifier in the case of that multiple targets get thesame votes.
     3. From the perspective of information fusion, an identifying method with multiplecombinations of classifiers which integrate target length and subspace feature isproposed. The length feature is used to rough classify, and the classified results are usedto narrow the search scope of WOAO classifier, so as to improve the recognitionperformance.
     4. When classical Relief algorithm is adopted to select features for HRRP, iftargets’ distribution is uneven on one feature, the evaluated result of this feature will be inaccurate. Thus, a modify Relief (MRe) feature selection algorithm is proposed, whichcan solve the influence of the targets’ uneven distribution to the feature weight byincreasing the proportion of each pair of successfully classified samples to weightedaccumulation. In this case, the selected features will be more beneficial for targetclassification
     5. In order to solve the problem of the out-of-database target rejection in targetrecognition system, we study an improved generalized confidence function to realizereliable identification of out-of-database targets by setting the refuse threshold for everytarget.
     6. On the basis of biomimetic pattern recognition theory, a rejection andrecognition algorithm based on the chain coverage model is proposed. By means of thisalgorithm, compact and closed geometric boundary is constructed in the feature space oftarget sample. This boundary represents the distribution shape of the target sample. Theacceptance or rejection of the samples is accomplished by judging whether or notsamples are within the target coverage area.
     The performance of all above-mentioned algorithms are verified by experimentsbased on real measured data and simulated data.
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