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Description: Automatic target detection in SAR image is the first stage in the ATR (Automatic Target Recognition) system. It is very important to improve the computing efficiency of the whole system. A conventional automatic target detection method is CFAR (constant false alarm rate) which is based only on the amplitude, discards the phase and thereby sacrifices half information of the SAR imagery. Almost each CFAR brings a large number of false alarms. 2L-IHP (two-look internal Hermitian product) is a new method which exploits the phase and amplitude information. In this paper, both CFAR and 2L-IHP algotithms are compared with an emphasis on 2L-IHP. The 2L-IHP algorithm for target detection is discussed briefly first. In order to apply it widely, it is modified to circumvent the constraint of the data. For polarimetric SAR images, PWF (Polarimetric Whitening Filter) is used to generate an image for target detection. According to ADTS data set, these algorithms are analyzed and evaluated respectively. C-、L- and P- band AIRSAR data are also processed, and some tentative conclusions are derived: Considering the penetrating ability of the microwave, L-band got the best detection accuracy of the three bands; HH polarization performed better for target detection than VV and HV polarization; Moreover, because more information is contained in polarimetric SAR data, here, we conclude that polarimetric SAR data have advantages over single polarized SAR data when they are applied for target detection. But all these conclusions need further validation.
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Size: 288371 |
Author: xbtown@126.com |
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Description: 这是对小波分析理论有研究的一个论文！大家互相借鉴！-This is the wavelet analysis theory of a research paper! We learn from each other!
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Size: 310272 |
Author: 邵立华 |
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Description: 卫星遥感图像，SARs遥感图像处理与分析-Satellite remote sensing images, SARs remote sensing image processing and analysis
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Size: 1753088 |
Author: waboy_zhao |
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Description: 星载SAR动目标模拟研究，通过分析星载合成孔径雷达的工作原理,建立了静止目标和动目标的斜视等效距离模型 在此基础上提出一种星载SAR动目标模拟方法,即在真实星载SAR数据中加入目标模拟回波信号 最后利用RD算法对静止和运动目标模拟成像,结果证明该方法是可行的,从而为星载SAR动目标检测和成像算法提供了有效简洁的数据源。
-Spaceborne SAR moving target simulation study, stationary targets and moving targets established by analysis of spaceborne Synthetic Aperture Radar works strabismus equivalent distance model based on a spaceborne SAR moving target simulation methods, real spaceborne SAR data the target analog echo signal Finally, the use of the the RD algorithm on stationary and moving targets analog imaging, and the results prove that this method is feasible and spaceborne SAR moving target detection and imaging algorithm provides a simple and effective data sources.
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Size: 1320960 |
Author: 李亮 |
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Description: SAR radar的訊號模擬,在LFM中加入雜訊,FFT分析訊號-SAR radar signal simulation, in the LFM adding noise, FFT signal analysis
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Size: 1024 |
Author: 賴欣呈 |
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Description: 在分析聚束合成孔径雷j盘(SAR)方位向时频关系的基础上，提出了一种新的全孔径分辨率SAR成像算法。
根据SAR在条带与聚束模式下回波信号之间的差别，利用现有成熟的条带SAR成像算法实现先对聚束SAR各方位向子
孔径成像，而后再将各方位子孔径带宽合成为全孔径带宽，以形成具有全孔径分辨率的SAR图像，极大降低了系统PRF
的要求。-In the analysis of spotlight synthetic aperture radar dish j (SAR) azimuth based on the time-frequency relationship, a new full-aperture resolution SAR imaging algorithm. According to SAR in strip and spotlight mode, the difference between the echo signal, the use of existing mature band SAR imaging algorithm first bit of the spotlight SAR the parties to the sub-aperture imaging, and then place then all the bandwidth synthetic aperture the bandwidth for the full aperture to form a full aperture resolution SAR images, greatly reducing the system PRF requirements.
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Size: 751616 |
Author: gaojianqiao |
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Description: SAR成像算法的分析； SAR成傢算法简要介绍 ；Chirp-scaling算法 ； 分布式小卫星SAR解方位多普勒模糊的点目标仿真； 分布式小卫星SAR成像的仿真参数 ；
点目标成像仿真及结果-SAR imaging algorithm analysis SAR algorithm married briefly Chirp-scaling algorithm distributed small satellite SAR azimuth Doppler ambiguity solution point target simulation distributed small satellite SAR imaging simulation parameters Point Target Imaging Simulation and results
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Size: 1836032 |
Author: gaojianqiao |
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Description: 分析了合成孔径雷达的模糊度问题及其对图像质量的影响, 详细描述了模糊度的
表达式, 分析了不同系统参数对模糊度的影响, 对所谓的重影现象作了定量分析-Analysis of synthetic aperture radar ambiguity problems and their impact on image quality, a detailed description of the fuzzy degree of expression of the different system parameters on the degree of influence on the so-called ghost phenomenon analyzed quantitatively
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Size: 766976 |
Author: gaojianqiao |
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Description: 针对合成孔径雷达(SAR) 图像含有大量斑点噪声的特点,基于Contourlet 的多尺度、局部化、方向性和各向
异性等优点,并结合隐马尔科夫树( HMT) 模型和隐马尔科夫场(MRF) ,提出了一种基于Contourlet 域持续性和聚
集性的SAR 图像模糊融合分割算法。该算法有效捕获了Contourlet 子带的持续性和聚集性,并分别用HMT 和
MRF 来刻画,再依据模糊测度,将多尺度HMT 和MRF 有机融合,建立Contourlet 域HMT2MRF 融合模型,并导
出新模型下的最大后验概率(MAP) 分割公式。对实测SAR 图像进行了仿真,仿真结果和分析表明:与小波域上的
HMT2MRF 融合分割及Contourlet 域上HMT 和MRF 分割算法相比,该算法在抑制斑点噪声的同时,有效地提高
了SAR 图像的分割精度- In view of the speckle noise in the synthetic aperture radar (SAR) images , and based on the Contourlet′s
advantages of multiscale , localization , directionality , and anisot ropy , a new SAR image fusion segmentation
algorithm based on the pe rsis tence and clustering in the Contourlet domain is p roposed. The algorithm captures the
pe rsis tence and clus tering of the Contourlet t ransform , which is modeled by hidden Markov t ree (HMT) and Markov
random field (MRF) , respectively. Then , these two models are fused by fuzzy logic , resulting in a Contourlet
domain HMT2MRF fusion model . Finally , the maximum a poste rior (MAP) segmentation equation for the new fusion
model is deduced. The algorithm is used to emulate the real SAR images . Simulation results and analysis indicate that
the p roposed algorithm effectively reduces the influence of multiplicative speckle noise , imp roves the segmentation
accuracy and p rovides a bet te r visual quality for SAR images ove r the
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Size: 897024 |
Author: 周二牛 |
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Description: 关于SAR的一个仿真程序，采用RD算法编写的一个MATLAB源程序，通过仔细分析还可以很方便的将其扩展为用于实测数据的成像。-On the SAR of a simulation program, written by RD algorithm, a MATLAB source, through careful analysis also can easily be extended to the measured data for imaging.
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Size: 2048 |
Author: |
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Description: 灰度共生矩阵和纹理分析功能，能很好的对SAR图像进行分析和提取目标地物。-Gray symbiotic matrix and texture analysis function, can be a very good image of SAR analysis and extraction target features.
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Size: 9216 |
Author: 十一 |
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Description: SAR图像目标特征提取分析，很有用的哦，非常好的程序-SAR target feature extraction image analysis, useful Oh, very good program
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Size: 3023872 |
Author: 二毛 |
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Description: 以MSTAR为实验数据，对SAR影像进行杂波统计分析研究。利用高斯、瑞利、对数正态、LN、gamma函数模型对其拟合，通过K-S方法检验拟合精度-The MSTAR the experimental data, statistical analysis of SAR images of clutter. Gaussian, Rayleigh, lognormal, LN, gamma function model to its fitting, fitting by means of checking the accuracy of KS
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Size: 20604928 |
Author: 于双 |
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Description: 城市区域SAR图像中的直线目标提取方法，城市区域SAR图像中的直线目标提取方法-Linear Features Detection in SAR Images for Urban Analysis
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Size: 73728 |
Author: lm |
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Description: Quality of Synthetic Aperture Radar (SAR) images is very sensitive for both pulse signal spectrum purity and
stability of the radar platform flight path. In this paper detailed influence of this factors on SAR images quality is
analyzed. Analysis is based mainly on computer simulations. This kind of analysis is very important because not all SAR
image degradation factors can be compensated using digital signal processing algorithms
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Size: 311296 |
Author: yas |
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Description: 压缩感知在多基地合成孔径雷达中的应用，关于采样相关性与图像重建质量的关系分析-Compressed sensing applications in the multi-base synthetic aperture radar, relationship analysis on sampling correlation with the quality of image reconstruction
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Size: 460800 |
Author: HolisWang |
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Description: automatic method of building damage information extraction based on
the fractal analysis of the post-earthquake SAR imagery
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Size: 17101824 |
Author: Soufi |
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Description: SAR距离多普勒算法原理的研究以及未来发展状况的分析-SAR analysis from research and the future development of the principle of the Doppler algorithm
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Size: 282624 |
Author: 丁剑 |
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Description: SAR图像变化检测,可以对比同一地点不是时间的SAR图像变换，并聚类分析-SAR image change detection, you can compare the same place time of SAR image transformation and cluster analysis
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Size: 182272 |
Author: 柯少 |
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Description: In previous work, we presented GMTI detection and geo-location results from the AFRL Gotcha challenge data set, which was collected using a 3-channel, X-band, circular SAR system. These results were compared against GPS truth for a scripted vehicle target. The algorithm used for this analysis is known as ATI/DPCA, which is a hybrid of alongtrack interferometry (ATI) and the displaced phase center antenna (DPCA) technique. In the present paper the use of ATI/DPCA is extended in order to detect and geo-locate all observable moving targets in the Gotcha challenge data,
including both the scripted movers and targets of opportunity. In addition, a computationally efficient SAR imaging technique is presented, appropriate for short integration times, which is used for computing an image of the scene of interest using the same pulses of data used for the GMTI processing. The GMTI detections are then overlaid on the SAR image to produce a simultaneous SAR/GMTI map.
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Size: 1273856 |
Author: asgary
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