Results 261 to 270 of about 9,296 (290)

One-dimensional spectrum extrapolation for circular SAR imaging

Proceedings of the 9th International Symposium on Antennas, Propagation and EM Theory, 2010
Two-dimensional resolution and peak sidelobe ratio (PSLR) of circular SAR (CSAR) change with the variation of relative bandwidth is discussed. Based on this discussion, an algorithm using one-dimensional autoregressive (AR) model to extrapolate spectrum data after matched filtering in range direction is presented. The simulation results of CSAR imaging
null Yu Ling-juan, null Zhang Yun-hua
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VHF/UHF-band SAR imaging using circular tracks

2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
Low frequency synthetic-aperture radar (SAR) in combination with change detection techniques can be used to search for stationary ground targets. In particular, the method has shown a great potential when vehicle-size objects are obscured by foliage. However. one possibility is to improve the detection capabilities to increase the aperture angle of the
Per-Olov Frolind, Lars M.H. Ulander, Anders Gustavsson, Gunnar Stenstrom   +3 more
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Interferometric Circular SAR Method for Three-Dimensional Imaging

IEEE Geoscience and Remote Sensing Letters, 2011
The aperture of 360° gives circular synthetic aperture radar (SAR) (CSAR) the capability to detect hidden target when its orientation is unknown. Subwavelength resolution can also be achieved when the target in the spotted area is observed under a complete circular aperture.
Yun Lin, Wen Hong, Weixian Tan, Yanping Wang, Yirong Wu   +4 more
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Analysis of circular aperture SAR image formation

2009 Conference Record of the Forty-Third Asilomar Conference on Signals, Systems and Computers, 2009
Remote surveillance using a synthetic aperture radar (SAR) flying a circular aperture offers several operational advantages over more traditional linear aperture SAR. Over the years, different SAR image formation algorithms have been proposed and analyzed. Almost exclusively, the analysis is based on straight line trajectory or linear aperture SAR.
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Airborne circular SAR imaging: Results at P-band

2012 IEEE International Geoscience and Remote Sensing Symposium, 2012
The first airborne Circular SAR data acquisition experiment of China was carried out in Sichuan by the National Key Laboratory of Science and Technology on Microwave Imaging (MITL), China. Data was acquired using the MITL's P-band, fully polarimetric SAR system along a circular trajectory with the beam spotted on the same area.
Yun Lin, Wen Hong, Weixian Tan, Yanping Wang, Maosheng Xiang   +4 more
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A parallelogram shaped arm for improving circular SARs

IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293), 2003
An existing instrumentation radar with 3D capabilities has been modified in order to achieve a more suitable aperture in the z-direction. The aperture being originally circular had as a draw back the fact that objects very soon left the real aperture of the antenna, hence resolution in height was rather poor. A parallelogram shaped arm was invented and
H. Rudolf, D. Leva, D. Tarchi, A.J. Sieber   +3 more
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Modified back projection reconstruction for circular FMCW SAR

2014 International Radar Conference, 2014
In this paper, we develop the modified back projection reconstruction algorithm for circular frequency modulated continuous wave synthetic aperture radar (FMCW SAR) which moves along circular trajectory. Regarding circular FMCW SAR signal processing, the movement during the transmission of a pulse is expected to be one of the major problems.
Gaowei Jia, Wenge Chang
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Breast tumor detection using UWB circular-SAR tomographic microwave imaging

2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), 2015
This paper describes the possibility of detecting tumors in human breast using ultra-wideband (UWB) circular synthetic aperture radar (CSAR). CSAR is a subset of SAR which is a radar imaging technique using a circular data acquisition pattern. Tomographic image reconstruction is done using a time domain global back projection technique adapted to CSAR.
Daniel, Oloumi, Pierre, Boulanger, Atefeh, Kordzadeh, Karumudi, Rambabu   +3 more
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Processing of Circular SAR trajectories with Fast Factorized Back-Projection

2011 IEEE International Geoscience and Remote Sensing Symposium, 2011
This paper describes the implementation of an efficient implementation of a Fast Factorized Back Projection (FFBP) algorithm for Circular SAR (CSAR) trajectories for real airborne data. Unlike Fourier-domain based focusing processors, this approach considers the azimuth variance and topography changes with high accuracy, while improving significantly ...
Ponce, Octavio, Prats, Pau, Rodriguez-Cassola, Marc, Scheiber, Rolf, Reigber, Andreas   +4 more
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Circular SAR motion compensation using trilateration and phase correction

IET International Radar Conference 2013, 2013
Circular SAR (CSAR) has raised an increasing interest in recent years. As a new SAR imaging mode, it has the ability to achieve sub-wavelength resolution for isotropic targets on planar ground and 3-D reconstruction [1] . However the high resolution depends on high accuracy of platform position.
Z.Y. Guo, Y.P. Wang, Y. Lin, W.X. Tan, W. Hong   +4 more
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