Filters








2,572 Hits in 4.9 sec

Parametric Synthetic Aperture Radar Image Recovery for Multiple Linear Structures: An Image Domain Approach

Yuhan Wen, Yan Wang, Zegang Ding, Tao Zeng, Xinliang Chen
2020 Remote Sensing  
This paper proposes a parametric SAR image recovery method for linear structures of extended targets.  ...  By extracting the spatial phase distribution feature in image domain, the proposed method is used to identify the endpoints among all of the scattered points in SAR images and reconstruct the disappeared  ...  Acknowledgments: The authors would like to thank the anonymous referees and the Associate Editor for useful comments that have helped to improve the presentation of this paper.  ... 
doi:10.3390/rs12121996 fatcat:cocg2ovcbjgabc722dstzxgx6a

BODY-OF-REVOLUTION-ENHANCED IMAGING IN ULTRA-WIDEBAND SAR

Fu-Lai Liang, Qian Song, Hanhua Zhang, Tian Jin, Zhi-Min Zhou
2013 Electromagnetic Waves  
For ultra-wideband synthetic aperture radar (UWB SAR), there often exist a lot of clutters in the image, and the weak targets are easy to be masked by them.  ...  In this paper, an enhanced imaging method for body of revolution (BOR) has been researched.  ...  The SAR image is the foundation of achieving good performance for target detection. However, the traditional SAR imaging techniques have the following two drawbacks.  ... 
doi:10.2528/pier13040402 fatcat:uv5ygqypwjh57og3ealr6q724a

Multi-Layered Circular Dielectric Structures' Synthetic Aperture Radar Imaging Based on Green's Function Using Non-Uniform Measurements

Baolong Wu, Guillermo Álvarez-Narciandi, Jaime Laviada
2020 Remote Sensing  
After that, the Green's function-based circular-SAR imaging method is applied to each projection circle.  ...  Among these approaches, the use of synthetic aperture radar (SAR) techniques with the compensation of the Green's function for multi-layered circular cylinders provides a trade-off between accuracy and  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs12071190 fatcat:fgemffr4r5cpzc7hugajbk3bn4

3D Fully Polarimetric Attributed Scattering Center Extraction Based on Sequential 2D SAR Images

Yue Zhao, Bo Jiu, Lei Zhang, Hongwei Liu, Zhenfang Li
2019 IEEE Access  
Considering that 3D images of the target are hard to obtain, 3D fully polarimetric attributed scattering center feature extraction from sequential 2D SAR images is addressed, and a novel method is proposed  ...  The numerical results for electromagnetic computation data and measurement data show the efficiency of the proposed method.  ...  In the next section, based on sparse representation in a frequency-azimuth-elevation domain, a 3D feature extraction method for target parameters i is proposed from sequential 2D SAR images.  ... 
doi:10.1109/access.2019.2914345 fatcat:qivov27aszcdznoegpmdkmjnta

New SAR target imaging algorithm based on oblique projection for clutter reduction

Frederic Brigui, Guillaume Ginolhac, Laetitia Thirion-Lefevre, Philippe Forster
2014 IEEE Transactions on Aerospace and Electronic Systems  
We have developed a new Synthetic Aperture Radar (SAR) algorithm based on physical models for the detection of a Man-Made Target (MMT) embedded in strong clutter (trunks in a forest).  ...  Our SAR algorithm applies the oblique projection of the received signal along the clutter subspace onto the target subspace.  ...  ACKNOWLEDGEMENT The authors thank DGA (french General Delegation for Armaments) for funding this project and ONERA (French Aerospace Lab) for providing us with real data.  ... 
doi:10.1109/taes.2014.110287 fatcat:kxpldaab5ffkdd2hfexm7czpda

SAR Target Detection Based on Improved SSD with Saliency Map and Residual Network

Fang Zhou, Fengjie He, Changchun Gui, Zhangyu Dong, Mengdao Xing
2022 Remote Sensing  
The experimental results on the GO-simulated image dataset and the MSTAR real image dataset demonstrate that the proposed method has better performance in SAR target detection than other detection methods  ...  A target detection method based on an improved single shot multibox detector (SSD) is proposed to solve insufficient training samples for synthetic aperture radar (SAR) target detection.  ...  On the GO dataset, the combination of the two methods works best for cylinder detection with 8.98% AP and 3.67% mAP.  ... 
doi:10.3390/rs14010180 fatcat:2wwwdw4ljjfmdgnveyeoyrsuoa

Performances Of Polarimetric Subspace Sar Processors For Target Detection And Interference Rejection

Frédéric Brigui, P. Forster, Guillaume Ginolhac, Laetitia Thirion
2011 Zenodo  
Publication in the conference proceedings of EUSIPCO, Barcelona, Spain, 2011  ...  As for the target model, we suppose that for each possible orientations of the cylinder at the position (x, y), its SAR response belongs to a low rank subspace J xy of rank D J [4] .  ...  In the SSD-SAR image, we have a difference of 1.5dB between the target intensity and the maximum of the interference intensities. This result becomes 3dB in the OBSAR image.  ... 
doi:10.5281/zenodo.42458 fatcat:l44lnf5xqzgurhldfx53zisvnq

Feature-enhanced SAR imaging algorithm based on attributed scatttering centre models for man-made radar targets

Jia Duan, Yifeng Wu, Lanying Cao
2019 The Journal of Engineering  
In order to enhance the integrity of components in SAR, a feature-enhanced (FE) imaging method for SAR is proposed, taking into account the inherent behaviours of components of radar targets.  ...  Traditional synthetic aperture (SAR) imaging methods assume that man-made targets are composed of point-based scattering centres.  ...  Acknowledgements should be placed after the conclusion and before the references section. Details of grants, financial aid and other special assistance should be noted.  ... 
doi:10.1049/joe.2019.0317 fatcat:dmhs2m36f5dovpvsmwlmpl7lfi

Expectation-maximization approach to target model generation from multiple synthetic aperture radar images

John A. Richards
2002 Optical Engineering: The Journal of SPIE  
We propose a method for generating a 3-D target model directly from multiple SAR images of a target obtained at arbitrary viewing angles.  ...  We pose the model generation problem as a parametric estimation problem based on information extracted from the SAR images.  ...  model from the multiple SAR images of a target.  ... 
doi:10.1117/1.1417493 fatcat:5tn6ucj56ffixikalrmwoo4lru

Image distortion in thermoacoustic tomography caused by microwave diffraction

Changhui Li, Manojit Pramanik, Geng Ku, Lihong V. Wang
2008 Physical Review E  
The distortion, due to microwave diffraction in the object to be imaged, leads to nonuniform excitation of acoustic pressure during microwave illumination.  ...  A method of partial correction is also provided.  ...  The reconstructed image may have a different shape and a larger size than the actual object. The image distortion for larger targets is different from that for smaller targets.  ... 
doi:10.1103/physreve.77.031923 pmid:18517438 fatcat:4slckbiukjat7fvgeedbvl523e

Feature extraction algorithm for 3D scene modeling and visualization using monostatic SAR

Julie A. Jackson, Randolph L. Moses, Edmund G. Zelnio, Frederick D. Garber
2006 Algorithms for Synthetic Aperture Radar Imagery XIII  
We employ these models to characterize a complex target geometry as a superposition of simpler, low-dimensional structures. Such a characterization provides a means for target visualization.  ...  The detection problem is to find canonical targets in clutter.  ...  scatterers (top-hat and trihedral) and non-zero for distributed scatterers (dihedral and cylinder).  ... 
doi:10.1117/12.666558 fatcat:45p2cv2c3ndjlde45r77unjbse

Experiment of Azimuth-invariant Bistatic UHF UWB SAR

Hongtu Xie, Shaoying Shi, Junfa Mao, Fuhai Li, Daoxiang An, Zhimin Zhou, Guoqian Wang
2018 Journal of Physics, Conference Series  
Bistatic image was obtained using the subaperture spectrumequilibrium method integrated with the fast factorized back projection algorithm (FFBPA).  ...  The aim was to investigate the imaging property of the bistatic UHF UWB SAR system.  ...  Figure 3 shows the optical image of imaging scene, which includes some various targets, such as the metallic reflectors, metallic cylinders, as well as metallic sphere and metallic mast, were deployed  ... 
doi:10.1088/1742-6596/960/1/012037 fatcat:sve5www34zcfjl3ceecrguujge

Radiofrequency energy deposition and radiofrequency power requirements in parallel transmission with increasing distance from the coil to the sample

Cem M. Deniz, Manushka V. Vaidya, Daniel K. Sodickson, Riccardo Lattanzi
2015 Magnetic Resonance in Medicine  
Results-In all cases, the target excitation profile was achieved and global SAR (as well as associated maximum local SAR) decreased with lift-off, approaching UISAR, which was constant for all lift-offs  ...  METHODS Simulations A dyadic Green's function (DGF) formulation (8,9) was used to derive the full-wave electromagnetic (EM) fields inside a dielectric sphere / cylinder, generated by a complete Deniz et  ...  ACKNOWLEDGMENTS The authors thank Dr. Graham Wiggins and Dr. Yudong Zhu for their suggestions in the study concept, and Dr.  ... 
doi:10.1002/mrm.25646 pmid:25752250 pmcid:PMC4561044 fatcat:yivspyeqhvaobbd3zde67epf2y

A high-precision SAR echo simulation method based on FDTD

Bin Zou, Yanqiu Jia, Zhijun Qiao, Ann M. Raynal, Kenneth I. Ranney
2021 Radar Sensor Technology XXV  
In this paper, a finite-difference time-domain (FDTD) based method is proposed for high-precision SAR echo simulation.  ...  Synthetic aperture radar (SAR) echo simulation offers a low-cost and convenient way to obtain high-resolution images of targets, and plays an important role in system design and algorithm validation.  ...  By doing the same treatment for all the other cells, the distribution of current at time  can be obtained.  ... 
doi:10.1117/12.2587380 fatcat:54ma66hxn5fjjbukljjl5vczvq

Oil tank detection in synthetic aperture radar images based on quasi-circular shadow and highlighting arcs

Huaping Xu, Wei Chen, Bing Sun, Yifei Chen, Chunsheng Li
2014 Journal of Applied Remote Sensing  
Oil tank detection using optical images has been developed in recent years, but few methods have been studied for oil tank detection in synthetic aperture radar (SAR) images.  ...  In general, a highlighting arc caused by the double reflection exists exactly at the bottom of each cylinder tank in a SAR image, so it can be employed to detect the oil tanks.  ...  The authors would like to thank German Aerospace Center for providing the TerraSAR-X data and reviewers for their hard work.  ... 
doi:10.1117/1.jrs.8.083689 fatcat:vgjq37xc4vaxphyujmgoogcj5m
« Previous Showing results 1 — 15 out of 2,572 results