Results 51 to 60 of about 83,251 (291)

Few‐shot learning for satellite characterisation from synthetic inverse synthetic aperture radar images

IET Radar, Sonar & Navigation
Space situational awareness systems primarily focus on detecting and tracking space objects, providing crucial positional data. However, understanding the complex space domain requires characterising satellites, often involving estimation of bus and ...
Friso G. Heslinga, Faruk Uysal, Sabina B. vanRooij, Sven Berberich, Miguel Caro Cuenca   +4 more
doaj   +1 more source

Experimental Synthetic Aperture Radar with Dynamic Metasurfaces

, 2017
We investigate the use of a dynamic metasurface as the transmitting antenna for a synthetic aperture radar (SAR) imaging system. The dynamic metasurface consists of a one-dimensional microstrip waveguide with complementary electric resonator (cELC ...
Boyarsky, Michael, Fromenteze, Thomas, Imani, Mohammadreza F., Pulido-Mancera, Laura, Reynolds, Matthew, Sleasman, Timothy, Smith, David R.   +6 more
core   +2 more sources

Sparse signal representation for complex-valued imaging [PDF]

, 2009
We propose a sparse signal representation-based method for complex-valued imaging. Many coherent imaging systems such as synthetic aperture radar (SAR) have an inherent random phase, complex-valued nature.
Cetin, Mujdat, Masnadi-Shirazi, Mohammad Ali, Samadi, Sadegh, Çetin, Müjdat   +3 more
core   +1 more source

Ellipsoid‐Based Interval‐Type Uncertainty Model Updating Based on Riemannian Manifold and Gaussian Process Model

International Journal of Mechanical System Dynamics, EarlyView.
ABSTRACT Modern engineering systems require advanced uncertainty‐aware model updating methods that address parameter correlations beyond conventional interval analysis. This paper proposes a novel framework integrating Riemannian manifold theory with Gaussian Process Regression (GPR) for systems governed by Symmetric Positive‐Definite (SPD) matrix ...
Yanhe Tao, Qintao Guo, Jin Zhou, Cheng Yi   +3 more
wiley   +1 more source

An Optically Transparent Transmissive Metasurface for User‐Defined Broadband Electromagnetic Illusion Generation

Small Structures, Volume 6, Issue 12, December 2025.
This work presents a transparent transmissive metasurface (TTM), designed using a conditional generative adversarial network to achieve broadband electromagnetic illusions. The proposed TTM ensures high optical transparency while precisely manipulating electromagnetic waves, demonstrating effectiveness in practical applications such as camouflage ...
Peixuan Zhu, Huan Lu, Haoran Han, Rongrong Zhu, Wei Zhou, Shiqi Zhu, Bin Zheng, Hongsheng Chen   +7 more
wiley   +1 more source

Multiple feature-enhanced SAR imaging using sparsity in combined dictionaries [PDF]

, 2012
Nonquadratic regularization-based image formation is a recently proposed framework for feature-enhanced radar imaging. Specific image formation techniques in this framework have so far focused on enhancing one type of feature, such as strong point ...
Cetin, Mujdat, Masnadi-Shirazi, Mohammad Ali, Samadi, Sadegh, Çetin, Müjdat   +3 more
core   +2 more sources

Radar Polarimetry in Glaciology: Theory, Measurement Techniques, and Scientific Applications for Investigating the Anisotropy of Ice Masses

Reviews of Geophysics, Volume 63, Issue 4, December 2025.
Abstract Dielectric anisotropy in ice alters the propagation of polarized radio waves, so polarimetric radar sounding can be used to survey anisotropic properties of ice masses. Ice anisotropy is either intrinsic, associated with ice‐crystal orientation fabric (COF), or extrinsic, associated with material heterogeneity, such as bubbles, fractures, and ...
Benjamin H. Hills, T. J. Young, David A. Lilien, Esther Babcock, Nicole Bienert, Donald Blankenship, John Bradford, Giancorrado Brighi, Alex Brisbourne, Jørgen Dall, Reinhard Drews, Olaf Eisen, M. Reza Ershadi, Tamara A. Gerber, Nicholas Holschuh, Daniela Jansen, Thomas M. Jordan, Nanna B. Karlsson, Jilu Li, Carlos Martín, Kenichi Matsuoka, Daniel May, Falk M. Oraschewski, John Paden, Nicholas M. Rathmann, Neil Ross, Dustin M. Schroeder, Martin Siegert, Matthew R. Siegfried, Emma Smith, Ole Zeising   +30 more
wiley   +1 more source

Pipelined digital SAR azimuth correlator using hybrid FFT-transversal filter [PDF]

, 1984
A synthetic aperture radar system (SAR) having a range correlator is provided with a hybrid azimuth correlator which utilizes a block-pipe-lined fast Fourier transform (FFT).
Liu, K. Y., Wu, C.
core   +1 more source

SAR moving target imaging using group sparsity [PDF]

, 2013
SAR imaging of scenes containing moving targets results in defocusing in the reconstructed images if the SAR observation model used in imaging does not take the motion into account.
Çetin, Müjdat, Önhon, Özben Naime
core   +1 more source

A U.S. Scientific Community Vision for Sustained Earth Observations of Greenhouse Gases to Support Local to Global Action

AGU Advances, Volume 6, Issue 6, December 2025.
Abstract Managing carbon stocks in the land, ocean, and atmosphere under changing climate requires a globally‐integrated view of carbon cycle processes at local and regional scales. The growing Earth Observation (EO) record is the backbone of this multi‐scale system, providing local information with discrete coverage from surface measurements and ...
N. Parazoo, D. Carroll, J. B. Abshire, Y. M. Bar‐On, R. A. Birdsey, A. A. Bloom, K. W. Bowman, R. K. Braghiere, L. M. Bruhwiler, B. Byrne, A. Chatterjee, D. Crisp, L. Duncanson, A. F. Feldman, A. M. Fox, C. Frankenberg, B. A. Gay, F. Hopkins, F. M. Hoffman, J. R. Holmquist, L. R. Hutyra, M. Keller, C. D. Koven, J. L. Laughner, J. Liu, N. S. Lovenduski, N. Macbean, G. A. McKinley, G. McNicol, D. Menemenlis, A. M. Michalak, C. E. Miller, H. Nesser, T. Oda, E. M. Ordway, L. E. Ott, K. Paustian, Z. A. Pierrat, B. Poulter, S. C. Reed, D. S. Schimel, S. P. Serbin, S. S. Saatchi, H. Suto, L. Windham‐Myers, D. Wunch   +45 more
wiley   +1 more source