在X光编码孔径成像系统中,系统的点扩散函数决定成像系统的成像质量。由于系统的点扩散函数可用来求解系统的传递函数,并可由此制作实现图像重构的滤波器,因此点扩散函数的精确程度直接影响重构过程中图像的质量。本文以标量衍射理论为基础,从理论上推导出了衍射效应条件下编码孔径中圆环的点扩散函数,并将它用于制作光学系统的滤波器。最后利用Wiener滤波函数对编码重叠像的频谱分布进行滤波处理,再经过逆傅里叶变换得到了重构图像。
2021-12-20 13:45:20 336KB 工程技术 论文
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对聚波束脉冲合成孔径雷达的算法进行了仿真,仿真了四种算法
2021-12-15 21:51:42 5KB spotlight 雷达波束 SAR 合成孔径波束
This lecture series gives comprehensive overview of the broad field of advanced radar systems, signal and data processing. The series starts with a lecture by U. Nickel in which the basic and fundamental of signal processing for phased array radar and their problems with grating lobes, ambiguities, and angle estimation for instance. The lecture “Advanced target tracking techniques” by W. Koch gives a short introduction to the principle of target tracking and several approaches are discussed for sequential track extraction and for phased-array radars. In the third lecture P. Berens gives an introduction to the synthetic aperture radar (SAR). T. Johnsen provides an overview of bi- and multistatic radar and their associated problems like synchronization, timing, and signal processing. The second lecture of U. Nickel focuses on the problem of adaptive array signal processing and provides the fundamental understanding for the next two lectures. The focus of these lectures, presented by W. Bürger, is on space-time adaptive processing. In his second lecture P. Berens continues with the topic of the synthetic aperture radar and expands the presented techniques to wideband SAR and multichannel SAR/MTI systems. W. Koch’s second paper focuses on sensor data and information fusion, which is essential to extract key-information for the final judgement using several sensors. In summery, this Lecture Series presents a unique overview of the state of the art of advanced radar and the associated signal and data processing research. It offers a variety of material for all those being involved in this scientific area, e.g. students, university teachers, researchers, industrial system designers, and military users.
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分布孔径雷达基础,与MIMO雷达的区别.pdf
2021-12-09 09:10:08 438KB 雷达
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包络对齐是逆合成孔径雷达(ISAR)平动补偿的关键技术,是图像重构的基础。依据设备所使用包络对齐方法,在积累互相关法的基础上进行算法改进,提出迭代相关对齐法。不同于原方法,迭代相关法使用平均距离像作为参考包络对各次回波作相关对齐,并进行多次迭代,直至收敛,有效地防止对齐漂移和突变误差的发生,从而保证了包络对齐的精度和稳定度。仿真结果表明,该方法能显著提高包络对齐精度从而提高ISAR成像质量,且运算量增加不大。
2021-12-06 15:05:20 212KB 包络对齐
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针对合成孔径雷达(SAR)目标识别问题,提出一种结合线性,非线性特征提取和分类器的方法。采用PCA和KPCA分别提取原始SAR图像的特征矢量。在此基础上,分别利用稀疏表示(SRC)和核稀疏表示(KSRC)对两类特征进行分类。通过线性,非线性特征,分类器的结合,可以更好地考察SAR图像的内部数据结构以及测试样本与训练样本的对应关系。实验中,基于MSTAR数据集进行性能测试,结果表明提出方法的有效性。
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合成孔径雷达(简称SAR)是一种主动式的对地观测系统,可安装在飞机、卫星、宇宙飞船等飞行平台上,全天时、全天候对地实施观测、并具有一定的地表穿透能力。因此,SAR系统在灾害监测、环境监测、海洋监测、资源勘查、农作物估产、测绘和军事等方面的应用上具有独特的优势,可发挥其他遥感手段难以发挥的作用,因此越来越受到世界各国的重视。
2021-11-30 14:49:32 2KB 雷达 sar 合成孔径
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合成孔径雷达图像理解,详细介绍了合成孔径雷达图像成像基础、原理、算法一建SAR图像的统计特征,并对雷达图像进行了详细分析。
2021-11-27 10:53:41 79.68MB sa
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正方形环形孔径夫琅禾费衍射光场的计算与模拟,陈波,刘佳伟,光的衍射在医学、微光学、信息编码、信息存储以及光通信中有着重要的应用。本文通过基尔霍夫衍射公式,计算得到了当单位振幅的单�
2021-11-22 17:58:31 350KB 首发论文
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是PPT,介绍了一些模型,概念,干涉雷达中常用的几种方法,和应用的具体例子
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