Results 201 to 210 of about 768,249 (233)

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 0002, Wen Hong, Weixian Tan, Yanping Wang, Yirong Wu   +4 more
openaire   +2 more sources

High resolution SAR imaging along circular trajectories

2007 IEEE International Geoscience and Remote Sensing Symposium, 2007
After a first series of full circle SAR acquisitions in L and P-bands during a 2004 joint FOI-ONERA campaign in Sweden, ONERA experimented in 2006 high resolution (15 cm) polarimetric, full circle acquisitions in France and Germany using its X-band sensor.
Hubert M. J. Cantalloube, Elise Colin Koeniguer, Hélène Oriot   +2 more
openaire   +1 more source

The Effect of Miniaturized Circular Antennas on the SAR Reduction for Wireless Applications

Wireless Personal Communications, 2023
International ...
Hamza Ben Hamadi, Said Ghnimi, Lassaad Latrach, Philippe Benech, Ali Gharsallah   +4 more
openaire   +2 more sources

A multiple-subapertures autofocusing algorithm for circular SAR imaging

2015 IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2015
Due to trajectory complexity of circular synthetic aperture radar (CSAR), it is very difficult to compensate motion errors accurately using conventional frequency-based SAR autofocusing approaches. With point-by-point coherent integration, autofocus back projection (ABP) algorithm is promising for motion error correction in the case of complex ...
Bo-Jun Zhang, Xiaoling Zhang 0002, Shun-Jun Wei   +2 more
openaire   +1 more source

Reconnaissance with slant plane circular SAR imaging

IEEE Transactions on Image Processing, 1996
This paper presents a method for imaging from the slant plane data collected by a synthetic aperture radar (SAR) over the full rotation or a partial segment of a circular flight path. A Fourier analysis for the Green's function of the imaging system is provided. This analysis is the basis of an inversion for slant plane circular SAR data.
openaire   +2 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

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

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