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Jiwei Z.,CAS Institute of Electronics | Xiaolan Q.,Key Laboratory of Spatial Information Processing and Application System Technology | Bin L.,University of Chinese Academy of Sciences
Journal of Electronics | Year: 2014

With the continuous improvement of Synthetic Aperture Radar (SAR) resolution, interpreting the small targets like aircraft in SAR images becomes possible and turn out to be a hot spot in SAR application research. However, due to the complexity of SAR imaging mechanism, interpreting targets in SAR images is a tough problem. This paper presents a new aircraft interpretation method based on the joint time-frequency analysis and multi-dimensional contrasting of basic structures. Moreover, SAR data acquisition experiment is designed for interpreting the aircraft. Analyzing the experiment data with our method, the result shows that the proposed method largely makes use of the SAR data information. The reasonable results can provide some auxiliary support for the SAR images manual interpretation. © Springer International Publishing Switzerland 2014. Source


Liu Q.,University of Chinese Academy of Sciences | Zhang Y.,Key Laboratory of Spatial Information Processing and Application System Technology | Qiu X.,Key Laboratory of Spatial Information Processing and Application System Technology | Hu W.,Key Laboratory of Spatial Information Processing and Application System Technology
Proceedings of the 2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar, APSAR 2015 | Year: 2015

The shadow is a particular phenomenon in SAR images, inflecting some information of the target. However, the shadow edges are blurred in SAR images. Thus, we analyze the causes for the blurring phenomenon of shadow edges in terms of SAR imaging algorithms in this paper. Taking the range Doppler algorithm for example, we conduct four simulation experiments to compensate for different processing steps and compare the imaging discrepancy among the refocused shadow edges. The conclusions are that the blurring phenomenon of shadow edges in SAR images is mainly reflected in azimuth, and azimuth compression is the major impact-factor to the shadow imaging quality. It is obvious that optimization of azimuth compression should get more attention for shadow enhancement in SAR images. © 2015 IEEE. Source


Xiong W.-C.,Key Laboratory of Spatial Information Processing and Application System Technology | Xiong W.-C.,CAS Institute of Electronics | Xiong W.-C.,University of Chinese Academy of Sciences | Wang H.-Q.,Key Laboratory of Spatial Information Processing and Application System Technology | And 4 more authors.
Dianzi Yu Xinxi Xuebao/Journal of Electronics and Information Technology | Year: 2014

SAR imaging simulator is an important tool for understanding and implementing the SAR images. In the light of the structural features of buildings, a novel fast SAR imaging simulator for urban structures based on facet projection model is proposed to meet the requirements of the SAR image interpretation applications for buildings. The geometry mapping process from the target model to the image-domain is accelerated by using simplified ray tracing algorithm, and the facet projection model is performed to reduce interpolating error from scattering facets to resolution cells. Compared with the traditional SAR image simulator, this simulator strikes a balance between accuracy and efficiency. Some experiments validate the facet projection model and demonstrate the efficiency of the simulator, which will offer a higher value of practical applications. Source


Zhang W.-Y.,CAS Institute of Electronics | Zhang W.-Y.,University of Chinese Academy of Sciences | Zhang W.-Y.,Key Laboratory of Spatial Information Processing and Application System Technology | Li F.-F.,CAS Institute of Electronics | And 9 more authors.
Proceedings of 2011 IEEE CIE International Conference on Radar, RADAR 2011 | Year: 2011

Enhanced SAR ocean images with dominant wave-like signatures might promote oceanographic applications. Therefore we develop a wave model based processor for wave features enhancement. Algorithm analysis and experiments based on spaceborne (ERS-2) SAR ocean image show the reasonable capabilities. © 2011 IEEE. Source


Ruipeng X.,Key Laboratory of Spatial Information Processing and Application System Technology | Ruipeng X.,CAS Institute of Electronics | Xiaolan Q.,Key Laboratory of Spatial Information Processing and Application System Technology | Xiaolan Q.,CAS Institute of Electronics | And 4 more authors.
ICSPS 2010 - Proceedings of the 2010 2nd International Conference on Signal Processing Systems | Year: 2010

A novel single channel SAR-GMTI method is proposed in this paper. When the azimuth mismatch filter performs compression, it induces shifted difference between the stationary and moving targets because of having different Doppler center. The proposed method employs this character to separate moving targets from stationary targets. It can produce two images by pulse compression which make use of two symmetrical mismatch filters in azimuth direction, and then cancel stationary and retain moving targets by subtracting one image from another. Compared with traditional methods, it is applicable to both low and high squint case and the detection capability is significantly improved. The simulation results validate the effectiveness of the proposed method. © 2010 IEEE. Source

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