Results 81 to 90 of about 18,633 (206)

Maximum entropy regularization in inverse synthetic aperture radar imagery [PDF]

IEEE Transactions on Signal Processing, 1992
The method of maximum entropy is applied to the regularization of inverse synthetic aperture radar (ISAR) image reconstructions. This is accomplished by considering an ensemble of images with associated 'allowed' probability density functions. Instead of directly considering the 'solution' to be an image, the author takes it to be the a posteriori ...
openaire   +1 more source

Environmental heterogeneity and spatial variation mediates plant diversity and ecosystem stability in mountain ecosystems of the Mediterranean Andes

Ecography, Volume 2026, Issue 4, April 2026.
Globally, mountains are highly diverse ecosystems that serve as natural laboratories for testing ecological theories, while providing vital ecosystem services. Their biodiversity arises from the interaction between elevational gradients and topographic complexity, which generate strong variation in environmental conditions across short spatial scales ...
Laura C. Pérez‐Giraldo, José M. Cerda‐ Paredes, Dylan Craven, Javier Lopatin   +3 more
wiley   +1 more source

Sparse representation-based SAR imaging [PDF]

, 2009
There is increasing interest in using synthetic aperture radar (SAR) images in automated target recognition and decision-making tasks. The success of such tasks depends on how well the reconstructed SAR images exhibit certain features of the underlying ...
Cetin, Mujdat, Masnadi-Shirazi, Mohammad Ali, Samadi, Sadegh, Çetin, Müjdat   +3 more
core   +1 more source

Self‐Templated Hierarchically Porous Graphitic Aerogels for Emi Shielding

Small, Volume 22, Issue 22, 17 April 2026.
This work presents a self‐templated, single‐component hierarchically porous graphitic aerogel derived from albumen through pyrolysis for lightweight EMI shielding applications. Controlled thermal processing enables tunable structure, electrical conductivity, and attenuation mechanisms.
M. Shaharyar Wani, Yusuf O. Jimoh, Erick Zaragoza, Paul R. Prucnal, Craig B. Arnold   +4 more
wiley   +1 more source

Correction of Non‐Geophysical Errors in SAR Doppler Shift for Ocean Surface Current Retrieval

Earth and Space Science, Volume 13, Issue 4, April 2026.
Abstract Synthetic aperture radar (SAR) data contains Doppler information on ocean surface movement, and the Doppler centroid anomaly (DCA) can be used to quantitatively retrieve ocean surface currents in the line‐of‐sight of radar. However, non‐geophysical errors (NGE) in Doppler information significantly affect retrieval accuracy. Generally, existing
Wenjia Zhao, Yawei Zhao, Yongsheng Xu, Yanlei Du, Xiaolan Qiu, Jinsong Chong   +5 more
wiley   +1 more source

Modeling Wind‐Driven Waves on Other Planets: Applications to Mars, Titan, and Exoplanets

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract Waves could exist on any planet with sustained winds and stable surface liquids. However, differences in atmospheres, liquids, and gravity confound efforts to extend Earth‐based empirical wave models to other planetary environments. We adapted a physics‐based numerical wave model to study how planetary conditions affect the growth of waves. We
Una G. Schneck, Charlene E. Detelich, Milan Curcic, Andrew D. Ashton, Alexander G. Hayes, J. Taylor Perron   +5 more
wiley   +1 more source

Three dimensional scattering center imaging techniques [PDF]

Two methods to image scattering centers in 3-D are presented. The first method uses 2-D images generated from Inverse Synthetic Aperture Radar (ISAR) measurements taken by two vertically offset antennas.
Burnside, W. D., Younger, P. R.
core   +1 more source

Conservation Agriculture Enhances Soil Organic Carbon: A 5‐Year Assessment Using Sentinel‐2 and Machine Learning

Soil Use and Management, Volume 42, Issue 2, April‐June 2026.
ABSTRACT Monitoring soil organic carbon (SOC) dynamics is crucial for sustainable agriculture, soil health, and climate change mitigation. In this study, we assessed 5‐year SOC changes in conventional (CO) and conservation agriculture (CA) fields across France and Italy using a combination of Sentinel‐2 satellite imagery and machine learning (ML ...
Fabio Castaldi, Flavio Bertinaria, Piero Toscano   +2 more
wiley   +1 more source

High Resolution Full-Aperture ISAR Processing through Modified Doppler History Based Motion Compensation

Sensors, 2017
A high resolution inverse synthetic aperture radar (ISAR) technique is presented using modified Doppler history based motion compensation. To this purpose, a novel wideband ISAR system is developed that accommodates parametric processing over extended ...
Jung-Hwan Song, Kee-Woong Lee, Woo-Kyung Lee, Chul-Ho Jung   +3 more
doaj   +1 more source

GLRT‐based detection of targets composed of distributed scattering centres

IET Radar, Sonar & Navigation
Attributed scattering problems have been found to be helpful in inverse synthetic aperture radar (ISAR) imaging and target recognition problems. In this model, the scattering centres are divided into two categories: localised and distributed.
Amir Mohammad Hatami, Seyyed Mohammad Karbasi, Mohammad Mahdi Nayebi   +2 more
doaj   +1 more source