Results 261 to 270 of about 730,674 (291)

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 ...
Octavio Ponce, Pau Prats, Marc Rodriguez-Cassola, Rolf Scheiber, Andreas Reigber   +4 more
openaire   +3 more sources

Data processing in frequency imaging of circular SAR

2015 IEEE 5th Asia-Pacific Conference on Synthetic Aperture Radar (APSAR), 2015
This paper proposes an algorithm to process the data acquired of the targets underneath the circular center, which cannot be focused by frequency algorithms directly. Using the vector expression, the azimuth frequency modulation rate is partitioning into velocity and acceleration parts. After compensation of the acceleration parts, the circular path is
Gaogao Liu, Bing Wu, Guodong Qin, Jingjing Cai, Dan Bao   +4 more
openaire   +1 more source

Circular SAR experiment for human body imaging

2007 1st Asian and Pacific Conference on Synthetic Aperture Radar, 2007
In this paper, the CSAR (circular synthetic aperture radar) technique is introduced firstly. The principle of CSAR 3D (three dimensional) imaging and the spatial wavenumber support are analyzed and the 3D resolution is discussed secondly. Secondly, Ku band fully-polarimetric CSAR human body imaging experiments are performed, and the experimental data ...
Wei-xian Tan, Yan-ping Wang, Wen Hong, Yi-rong Wu, Nan jing Li, Chu-feng Hu, Lin-xi Zhang   +6 more
openaire   +1 more source

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
openaire   +1 more source

Range focusing for large scene circular SAR

2012 IEEE National Aerospace and Electronics Conference (NAECON), 2012
A recent circular synthetic aperture radar data collection contained various vehicles and calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scattering features show noticeable drift on the order of 2 m from orbit to orbit.
Kerry E. Dungan, John W. Nehrbass
openaire   +1 more source

Circular SAR Imaging Approximated by Spotlight Processing

2006 7th International Symposium on Antennas, Propagation & EM Theory, 2006
In this paper, the differences between circular synthetic aperture radar (CSAR) and traditional linear synthetic aperture radar are briefly analyzed with mathematical model of CSAR introduced. To verify the conclusion that CSAR can get much higher resolution than traditional linear SAR can, even with the same radar parameters, we present an ...
Xiangkun Zhang, Yunhua Zhang, Jingshan Jiang   +2 more
openaire   +1 more source

Compressed sensing technique for circular SAR imaging

IET Conference Publications, 2009
Compressed sensing (CS) has been receiving a lot of interest because it provides possibilities to reconstruct signals or images from significantly fewer samples than Nyquist theorem acquire. In this paper, we apply this technique to circular SAR (CSAR).
null Yun Lin, null Wen Hong, null Wei-xian Tan, null Yan-ping Wang   +3 more
openaire   +1 more source

Research of P band circular polarization SAR

2016 CIE International Conference on Radar (RADAR), 2016
For space-borne P band Synthetic Aperture Radar (SAR) application, an airborne experimental circular&linear polarimetric SAR system is developed, this paper presents the instrument and airborne test result. Compared to linear polarization of P band, circular polarimetric SAR shows remarkable penetration efficacy in tropical jungle foliage covered ...
Zhao Ning, Lu Jiaguo, Ge Jialong, Yao Baidong   +3 more
openaire   +1 more source

Vehicle Layover Removal in Circular SAR Images via ROSL

IEEE Geoscience and Remote Sensing Letters, 2015
Circular synthetic aperture radar (CSAR) has raised interest in both wide-aspect-angle 2-D imaging and 3-D feature reconstruction. As for CSAR 2-D imaging with a 360° aperture, vehicles spotlighted in the scene are depicted with multiview layover, which makes the imagery intuitively less comprehensible.
Zhiguang Zhang, Hong Lei, Zhifeng Lv
openaire   +2 more sources

Very high resolution circular SAR imaging at X band

2014 IEEE Geoscience and Remote Sensing Symposium, 2014
This paper presents a new acquisition capability of the ONERA RAMSES-NG SAR sensor consisting in circular imaging, and an associated experiment. Target recognition or area monitoring is tricky using classical SAR imaging because only a part of the object shape is visible.
Xavier Dupuis, Philippe Martineau
openaire   +2 more sources