搜索结果: 16-30 共查到“信息与通信工程 SAR”相关记录633条 . 查询时间(0.031 秒)
一种多普勒域走动校正的斜视SAR成像算法
合成孔径雷达 线性调频变标 斜视成像
2016/3/2
为了解决时域校正走动带来的方位空变性问题，提出了一种在方位多普勒域走动校正的斜视合成孔
径雷达（ＳＡＲ）成像算法。文中利用级数反演理论，将斜距公式展开至三次项，推导出ＳＡＲ回波信号的两维频谱表
达式。再从两维频谱出发，提出了基于两维频谱匹配滤波的斜视ＳＡＲ成像算法。该算法考虑到距离空变性问题，
提出先在两维频域进行走动校正和相位预滤波，接着在距离多普勒域进行线性频率变标的处理方法，经过距离脉...
对调频斜率极性捷变SAR欠采样转发干扰
合成孔径雷达 调频斜率极性捷变 欠采样转发干扰 多假目标
2016/7/27
针对传统欺骗干扰难以对调频斜率极性捷变SAR（chirp rate polarity jittered SAR, CRPJ-SAR）形成有效干扰，研究了对CRPJ-SAR欠采样转发干扰。通过建立CRPJ-SAR有限时长欠采样转发干扰信号模型，分析了欠采样转发干扰对CRPJ-SAR的干扰效果。给出假目标数目、位置以及幅度的理论计算公式。在此基础上讨论了欠采样周期对干扰效果的影响。利用数字仿真验证了理...
System Requirements and Mission Analysis for Spaceborne SAR Interferometry Based on Formation Flying Satellites
System Requirements Mission Analysis Spaceborne SAR Interferometry Based Formation Flying Satellites
2015/11/20
With the purpose of further development of SAR satellite technique and for Earth’s topography, SAR interferometry, with which one can get, not only images with target’s azimuth and range information, ...
Image Coregistration in SAR Interferometry
SAR Interferometry Co-registration Interferometric SAR (InSAR)
2015/11/20
A critical procedure in Synthetic Aperture Radar (SAR) Interferometric (InSAR) processing was studied: SAR image coregistration. Two pairs of ERS-1/2 SAR tandem data, representing diverse terrain type...
Research on SAR Image Matching Technology based on SIFT
SAR Curvelet De-noising SIFT Image Matching
2015/11/20
Image matching is one of the key technologies in remote sensing image fusion and navigation. Image matching of Synthetic Aperture Radar (SAR) is a process to find relationship of pixels in many SAR im...
Study on Airborne SAR Image Matching Using Epipolar
Airborne SAR Image Matching Radar Photogrammetry Epipolar Geometry Template Matching
2015/11/20
Aerial photos are broadly used to generate the 4D(DEM, DOM, DLG, DRG) products in photogrammetry, but there are some difficult areas where are usually rainy and cloudy, so in these areas optical image...
An Insitu Single-pointed Wavelet-Based Method for Noise Reduction in SAR Images
Synthetic Aperture Radar (SAR) Speckle noise Insitu Single-pointed Wavelet-based (ISPW) Method,
2015/11/20
Speckle noise caused by interference of electromagnetic waves complicates Synthetic aperture radar (SAR) images to be interpreted and further practical application, therefore reducing speckle noise an...
Wavelet Speckle Reduction for SAR Imagery Based on Edge Detection
Image processing Filtering Feature detection Geography Image understanding
2015/11/20
This paper introduces a wavelet transform speckle reduction algorithm for Synthetic Aperture Radar (SAR) imagery based on edge detection. Existing speckle algorithm can efficiently reduce the speckle ...
基于密度峰值搜索的全极化SAR图像分类
全极化合成孔径雷达 无监督分类 显著性图 密度峰值
2017/12/21
提出一种基于密度峰值搜索(find of density peaks,FDP)的全极化SAR图像(polarimetric synthetic aperture radar,POLSAR)无监督分类方法。由于在边缘地带以及奇异点的散射类型复杂,在无监督分类过程中干扰巨大,本文通过构建基于信息熵的显著性图来剔除这一类点的影响,并对剩余部分的参数进行了加权处理。随后在H//A/SPAN空间基于FD...
提出了一种相干矩阵的自适应估计方法,基于估计结果矩阵进行传统四分量分解,以提高高分辨率极化合成孔径雷达(synthetic aperture radar, SAR)四分量分解的准确性。该方法根据像元主要散射类型对估计样本做自适应选取,消除异质像元对估计结果的影响;并通过对地物异质度的判别实现窗口平均估计和不动点迭代估计的自适应选择,以适应不同异质程度的地物分布情况。实验采用ESAR以及UAVSAR...
基于FDTD的高保真SAR回波信号仿真方法
合成孔径雷达 回波仿真 时域有限差分方法 高保真
2017/12/21
针对传统合成孔径雷达(synthetic aperture radar, SAR)回波仿真算法忽略目标散射特性在观测时间内随方位角度和信号频率变化这一问题,提出一种基于时域有限差分方法(finite--difference time-domain method, FDTD)电磁散射计算的SAR原始回波数据生成方法,在此基础上提出了基于服务器的并行仿真策略及流程。该方法利用FDTD算法及后续仿真处理...
在微波高频段，海面背景或海上船类目标往往具有电大尺寸和复杂精细的结构，给船海复合场景的电磁建模带来巨大的计算负担。为简化计算量，基于海面电磁散射模型面元化思想和图形电磁学，结合计算耦合场的四路径模型，提出一种电大尺寸船海复合场景电磁散射的快速计算方法。在保证海面与目标复合散射场的计算准确性前提下，提高了计算效率。仿真并分析了不同雷达参数下动态海面与目标的雷达散射截面(RCS)，计算结果同实测数据与...
EFFECTS AND PERFORMANCE OF SPECKLE NOISE REDUCTION FILTERS ON ACTIVE RADAR AND SAR IMAGES
RADAR SAR Images Noise Speckle Filtering Adaptive Filter
2015/8/17
Reduction of speckle noise is one of the most important processes to increase the quality of radar coherent images. Image variances
or speckle is a granular noise that inherently exists in and degra...
STUDY ON RADAR DIFFERENTIAL INTERFEROMETRY TECHNOLOGY AND IT’S APPLICATION TO MANI EARTHQUAKE USING ERS-1/2 SAR DATA: A CASE STUDY IN CHINA
SAR Earthquakes Recognition Mapping Measurement Change Detection
2015/7/29
Mani Earthquake, occurred on Nov. 8, 1997 in Tibet, China, is the strongest event in China since 90’s in 20 century. Investigation
and research of its principle and geometry, dynamics related to sur...
APPLICATION OF RAJSKI DISTANCE TO LAND-COVER CLASSIFICATION USING POLARIMETRIC SAR AMPLITUDE IMAGE DATA
Remote Sensing Land Cover Classification
2015/7/29
Polarimetric SAR can observe scattering matrix for each resolution cell and provide amplitude images that have gray level in
proportion to amplitude of the conjunction matrix elements. However, thes...