Results 201 to 210 of about 13,439 (259)

A Numerical Alternative to MR Thermometry for Safety Validation of Multi-Channel RF Transmit Coils. [PDF]

Magn Reson Med
Sadeghi-Tarakameh A, Schmidt S, Waks M, Lagore RL, Grant A, Auerbach E, DelaBarre L, Knudsen L, Lenglet C, Vizioli L, Yacoub E, Adriany G, Metzger GJ, Ugurbil K, Eryaman Y.   +14 more
europepmc   +1 more source

Joint feature issue in <i>Optics Express, Applied Optics</i>, and <i>Biomedical Optics Express</i>: Computational Optical Sensing and Imaging 2025. [PDF]

Biomed Opt Express
Gao L, Doblas A, Lee SA, Levi O, Luo Y, Zheng G.   +5 more
europepmc   +1 more source

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W-Band GB-SAR for 3D Imaging

2022 19th European Radar Conference (EuRAD), 2022
This paper presents a W-band Ground-based Synthetic Aperture Radar system able to acquire high resolution 3D images in just about 10 minutes. Resolution in both the horizontal plane and in elevation are obtained through mechanical scanning of the radar head along two orthogonal directions.
Alessandra Beni, Tommaso Consumi, Lapo Miccinesi, Massimiliano Pieraccini   +3 more
openaire   +1 more source

Sub-mm Resolution 3D SAR Imaging at 1.5 THz

2021 Fourth International Workshop on Mobile Terahertz Systems (IWMTS), 2021
The frequency range of synthetic aperture radar is being extended to the promising THz spectrum as it provides high spatial resolution. The spectrum broadens the SAR applications to sub-mm resolution imaging and localization, non-destructive testing, and material characterization. Although the spectrum suffers from high atmospheric attenuation and free
Batra, Aman, Wiemeler, Michael, Gohringer, Diana, Kaiser, Thomas   +3 more
openaire   +2 more sources

3D Imaging of Ground based SAR Data

IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium, 2008
Ground-based SAR systems play a key role in active microwave remote sensing in many areas of environmental risk monitoring. Real time capability and flexibility make ground-based SAR suitable for monitoring in emergency cases, such as sudden landslide or volcanic activities. In this work we propose a 3D SAR imaging, for a ground-based stepped frequency
Diego Reale, Vito Pascazio, Gilda Schirinzi, Francesco Serafino 0001   +3 more
openaire   +1 more source

Autofocus for 3D imaging with multipass SAR

SPIE Proceedings, 2010
The emergence of 3D imaging from multipass radar collections motivates the need for 3D autofocus. While several effective methods exist to coherently align radar pulses for 2D image formation from a single elevation pass, further methods are needed to appropriately align radar collection surfaces from pass to pass.
Noah Boss, Emre Ertin, Randolph Moses
openaire   +1 more source

Computational SAR ADC for a 3D CMOS image sensor

10th IEEE International NEWCAS Conference, 2012
The architecture and simulation of a Computational SAR ADC (C-SAR) dedicated to the processing of image descriptors for a 3D CMOS image sensor are reported here. The differential charge sharing architecture enables to A/D convert the convolution of multiple binary weighted pixels signals on multi-scale kernels.
Arnaud Verdant, Antoine Dupret, Michaël Tchagaspanian, Arnaud Peizerat   +3 more
openaire   +1 more source

3D Exploitation of SAR Images

1999
The special nature of synthetic aperture radar (SAR) images as opposed to optical images requires highly specialized processing. This paper is devoted to the task of 3D surface reconstruction from multiple radar images. We discuss SAR-specific modifications of well known algorithms (stereo, shape-from-shading), as well as new algorithms incorporating ...
Regine Bolter, Axel Pinz
openaire   +1 more source

Performance analysis of sparse 3D SAR imaging

SPIE Proceedings, 2011
This paper addresses the question of scattering center detection and estimation performance in synthetic aperture radar. Specifically, we consider sparse 3D radar apertures, in which the radar collects both azimuth and elevation diverse data of a scene, but collects only a sparse subset of the traditional filled aperture.
Christian D. Austin, Joshua N. Ash, Randolph L. Moses   +2 more
openaire   +1 more source

Sector interpolation for 3D SAR imaging with baseline diversity data

2007 International Waveform Diversity and Design Conference, 2007
SAR tomography is an emerging technique which can be used to derive full 3D SAR images of the observed areas. It is based on the Fourier elevation focusing of the signal acquired by means of baseline diversity. Unfortunately, the spatial baseline distribution is typically non-uniform, resulting in an unsatisfactory image quality.
LOMBARDINI, FABRIZIO, M. Pardini, GINI, FULVIO   +2 more
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