搜索结果: 1-15 共查到“雷达工程 SAR”相关记录402条 . 查询时间(0.173 秒)
GEOPHYSICAL PARAMETER RETRIEVAL FOR MICROWAVE C BAND SYNTHETIC APERTURE RADAR (SAR) DATASET USING INTEGRAL EQUATION MODEL
Microwave SAR Geophysical Parameters IEM Modelling
2019/2/28
The microwave remote sensing is highly useful, as it provides synoptic observation of the Earth’s surface or planetary bodies, regardless of day or night and the atmospheric conditions, propagation th...
GF-3 SAR IMAGE DESPECKLING BASED ON THE IMPROVED NON-LOCAL MEANS USING NON-SUBSAMPLED SHEARLET TRANSFORM
GF-3 SAR non-subsampled Shearlet transform image despeckling improved Non-Local Means
2018/5/15
GF-3 synthetic aperture radar (SAR) images are rich in information and have obvious sparse features. However, the speckle appears in the GF-3 SAR images due to the coherent imaging system and it hinde...
STUDY ON THE CLASSIFICATION OF GAOFEN-3 POLARIMETRIC SAR IMAGES USING DEEP NEURAL NETWORK
SAR Classification Deep Learning GoogLeNet Landcover Gaofen-3 satellite
2018/5/16
Polarimetric Synthetic Aperture Radar（POLSAR） imaging principle determines that the image quality will be affected by speckle noise. So the recognition accuracy of traditional image classification met...
TIE POINTS EXTRACTION FOR SAR IMAGES BASED ON DIFFERENTIAL CONSTRAINTS
Synthetic Aperture Radar (SAR) Tie Points Matching Extraction Differential Constraints
2018/5/16
Automatically extracting tie points (TPs) on large-size synthetic aperture radar (SAR) images is still challenging because the efficiency and correct ratio of the image matching need to be improved. T...
双基前视SAR几何定位及同步误差分析
合成孔径雷达 双基前视 无参考点定位 定位精度
2018/5/21
针对目标区域不存在图像匹配基准点如对海面目标、草原目标等定位时，基于图像匹配的目标定位方法失效问题，该文提出基于R-D原理的双基前视SAR几何定位方法。首先，在相邻合成孔径中心时刻，利用收发平台与目标的几何关系进行数学建模；再结合地距SAR图像中的目标与场景中心点的关系，解算目标相对接收平台的位置信息；最终，根据双基地前视SAR系统的特点，建立空时频同步误差模型，并结合仿真计算结果给出其对定位精度...
合成孔径雷达（synthetic aperture radar，SAR）在合成孔径累积时间内仅在小范围方位角获取目标的后向散射特性，导致SAR图像对观测方位向的变化极其敏感。通过图像非相干合成方法将不同方位向上的多幅同目标SAR图像合成单幅特征更明显的SAR图像，通过二维主成分分析方法提取特征和k-近邻分类方法实现目标识别。在两组不同数据集上对识别性能进行分析。实验结果表明，多角度SAR的识别率比...
间歇采样转发干扰形成的假目标排布较为规律易被识别。为克服这一缺点，针对合成孔径雷达(SAR)提出一种脉间周期式移频调制干扰算法。将间歇采样算法和多普勒移频干扰算法相结合，采用分段调制产生密集假目标。首先理论分析证明，干扰算法能够在超前于干扰机的指定位置产生具有压制效果的2维密集假目标，主假目标在方位向上偏离干扰机所在位置。然后分析了干扰效果及影响因素，建立了干扰参数获取模型并给出了假目标能量补偿系...
一种适用于大场景圆迹环扫SAR的改进CS成像算法
圆迹环扫ＳＡＲ 距离徙动 二维频谱 线性调频变标
2016/3/2
在宽测绘带圆迹环扫合成孔径雷达（ＣＳＳＡＲ）中，目标斜距表示形式复杂，测绘带内距离徙动（ＲＣＭ）
变化剧烈均给成像处理引入难点。针对上述问题，根据圆迹环扫ＳＡＲ平台的运动特性，使用高阶逼近的方法建立
圆弧曲线模型下的回波信号斜距方程，并以导出的二维频谱高阶近似解析表达式为基础，考虑大场景下的距离徙
动空变问题，对空变的斜距历程进行详细的分析，并提出了一种适用于大场景圆迹环扫ＳＡＲ的改进线性调...
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, ...
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...
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...