Results 11 to 20 of about 71,883 (307)

Polarization-Insensitive, Orthogonal Linearly Polarized and Orthogonal Circularly Polarized Synthetic Aperture Metalenses

Photonics, 2023
Metalenses have attracted much attention from researchers because they are thin, multifunctional and easy to integrate. However, due to the limitation of fabrication techniques and the influence of working wavelength, it is difficult to realize a large ...
Jijian Hu, Zhenghong Dong, Xuanwen Yang, Lurui Xia, Xueqi Chen, Yan Lu   +5 more
doaj   +1 more source

Synthetic aperture radio telescopes [PDF]

IEEE Signal Processing Magazine, 2010
Next-generation radio telescopes will be much larger, more sensitive, have a much larger observation bandwidth, and will be capable of pointing multiple beams simultaneously. Obtaining the sensitivity, resolution, and dynamic range supported by the receivers requires the development of new signal processing techniques for array and atmospheric ...
Ronny Levanda, Amir Leshem
openaire   +1 more source

Design of athermalized mounting structure for the sub-aperture primary mirror of a synthetic aperture telescope

Advances in Mechanical Engineering, 2022
The imaging quality of the synthetic aperture system is sensitive to the positioning accuracy of the sub-aperture primary mirror. A novel flexible mounting structure of bimetallic material is proposed for the athermalization of the sub-aperture primary ...
Yunfeng Li, Zongxuan Li, Qiang Yong, Tiancong Wang, Defu Zhang   +4 more
doaj   +1 more source

High resolution digital holographic synthetic aperture applied to deformation measurement and extended depth of field method [PDF]

, 2010
This paper discusses the potential of the synthetic-aperture method in digital holography to increase the resolution, to perform high accuracy deformation measurement, and to obtain a three-dimensional topology map.
Claus, Daniel
core   +1 more source

AUGMENTING THE PHILIPPINES’ DOST-ASTI’S POTENTIAL FLOOD EXTENTS MAPPING SERVICE WITH S-BAND NOVASAR-1 IMAGES [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
The Philippines’ Advanced Science and Technology Institute under the Department of Science and Technology (DOST-ASTI) has developed an AI-based and near real-time flood extent mapping service that utilizes C-Band Sentinel-1 SAR images.
J. B. L. C. Dumalag, J. B. L. C. Dumalag, K. L. S. Mariano, K. L. S. Mariano, N. R. Cadiz, N. R. Cadiz, A. E. Retamar, A. E. Retamar, J. C. Aceron, J. C. Aceron, M. M. Felicen, M. M. Felicen, M. C. Gelido, M. C. Gelido   +13 more
doaj   +1 more source

Research on frequency domain synthetic aperture focusing pipeline guided wave imaging based on phase migration

AIP Advances, 2021
In order to overcome the limitations of traditional ultrasonic imaging methods, which cannot directly give the imaging results of defects in a pipeline and have low imaging quality, a frequency domain synthetic aperture focusing pipeline imaging method ...
Wenwu Deng, Shengrong Long, Xuanyu Chen, Zhinong Li, Qiufeng Li   +4 more
doaj   +1 more source

TerraSAR-X Time Series Fill a Gap in Spaceborne Snowmelt Monitoring of Small Arctic Catchments—A Case Study on Qikiqtaruk (Herschel Island), Canada

Remote Sensing, 2018
The timing of snowmelt is an important turning point in the seasonal cycle of small Arctic catchments. The TerraSAR-X (TSX) satellite mission is a synthetic aperture radar system (SAR) with high potential to measure the high spatiotemporal variability of
Samuel Stettner, Hugues Lantuit, Birgit Heim, Jayson Eppler, Achim Roth, Annett Bartsch, Bernhard Rabus   +6 more
doaj   +1 more source

Ultrasonic Synthetic Apertures: Review

Archives of Acoustics, 2014
In the paper the concept of synthetic aperture used for high resolution/high frame rate ultrasonic imaging is reviewed. The synthetic aperture technique allows building extended “virtual” apertures, synthesized from smaller real aperture resulting in ...
Andrzej NOWICKI, Barbara GAMBIN
doaj   +1 more source

Synthetic aperture radar demonstration kit for signal processing education [PDF]

, 2007
A Synthetic Aperture Radar scale model has been developed to improve signal processing teaching. Based on low frequency ultrasound transmission, it is a low cost demonstration kit.
Chaumette, Eric, Nouals, Claude, Besson, Olivier, Olivier Besson, Mouton, Bernard, Eric Chaumette, Francois Vincent, Claude Nouals, Bernard Mouton, Vincent, François   +9 more
core   +1 more source

Synthetic Aperture Imaging of Dispersive Targets

IEEE Transactions on Computational Imaging, 2023
We introduce a dispersive point target model based on scattering by a particle in the far-field. The synthetic aperture imaging problem is then expanded to identify these targets and recover their locations and frequency dependent reflectivities. We show that Kirchhoff migration (KM) is able to identify dispersive point targets in an imaging region ...
Arnold D. Kim, Chrysoula Tsogka
openaire   +5 more sources