Results 81 to 90 of about 81,814 (282)

Two Dimensional Array Imaging with Beam Steered Data

, 2013
This paper discusses different approaches used for millimeter wave imaging of two-dimensional objects. Imaging of a two dimensional object requires reflected wave data to be collected across two distinct dimensions.
Patole, Sujeet, Torlak, Murat
core   +1 more source

Volcano‐Tectonic Crisis of Mayotte (2018–2022): A Deformation Model for Geodetic Applications

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.
Abstract Volcano‐tectonic unrest during the 2018–2022 crisis of Mayotte (Comoros archipelago) generated an island‐wide surface displacement reaching ∼ ${\sim} $20 cm, with a relative (internal) deformation of the island of ∼ ${\sim} $10 cm. Correcting for these displacements, which exceed the required accuracy of geodetic network reference coordinates,
Raphaël Grandin, Xavier Collilieux, Inès Pasquier, Olivier Jamet   +3 more
wiley   +1 more source

Refocusing Moving Ship Targets in SAR Images Based on Fast Minimum Entropy Phase Compensation

Sensors, 2019
Moving ship targets appear blurred and defocused in synthetic aperture radar (SAR) images due to the translation motion during the coherent processing. Motion compensation is required for refocusing moving ship targets in SAR scenes.
Xiangli Huang, Kefeng Ji, Xiangguang Leng, Ganggang Dong, Xiangwei Xing   +4 more
doaj   +1 more source

Analysis of a Persistent Early Winter Open Water Zone Within the Ice‐Covered Tanana River Near Fairbanks, Alaska Using Field Studies, Remote Sensing, and Hydraulic Modeling

Water Resources Research, Volume 61, Issue 10, October 2025.
Abstract Frozen rivers serve as important transportation corridors for Alaskans during winter. Open water zones (OWZs, i.e., open leads) in otherwise ice‐covered rivers present a hazard because their location and causes are poorly understood. We studied one persistent OWZ on the Tanana River near Fairbanks using field studies, remote sensing, and ...
Matthew Scragg, Christopher Arp, Allen Bondurant, Dana Brown, Taylor Sullivan, Horacio Toniolo   +5 more
wiley   +1 more source

Blur resolved OCT: full-range interferometric synthetic aperture microscopy through dispersion encoding [PDF]

, 2001
We present a computational method for full-range interferometric synthetic aperture microscopy (ISAM) under dispersion encoding. With this, one can effectively double the depth range of optical coherence tomography (OCT), whilst dramatically enhancing ...
A.M. Wing, F.E. Pollick, G.J.P. Savelsbergh, J.B.J. Smeets, M. Jeannerod, M. Jeannerod, N. Teasdale, T.G. Fikes   +7 more
core   +4 more sources

A Drone‐Borne GPR System for Lake and River Ice Thickness Monitoring

Water Resources Research, Volume 61, Issue 10, October 2025.
Abstract Monitoring ice on water is critical to study global and regional environmental change. However, accurate ice thickness mapping over a water body like a lake is still challenging. In this study, we first develop a drone‐borne ground penetrating radar (GPR) system for ice thickness monitoring.
Xu Meng, Zhenjun Zhu, Hai Liu, Yunlong Lian, Haijing Lu, Yikang Wang, Ruige Shi, Billie F. Spencer   +7 more
wiley   +1 more source

High-Resolution ISAR Imaging With Sparse Aperture VFM Waveforms Under Low SNR Condition

IEEE Access, 2019
In recent years, the compressed sensing theory has been widely used in sparse aperture radar imaging. The inverse synthetic aperture radar (ISAR) imaging based on the sparse aperture echo of V-style frequency modulation (V-FM) waveform, which can ...
Jiyuan Chen, Letao Xu, Xiaoyi Pan, Pu Zheng, Shunping Xiao   +4 more
doaj   +1 more source

An Extended Virtual Aperture Imaging Model for Through-the-wall Sensing and Its Environmental Parameters Estimation [PDF]

, 2014
Through-the-wall imaging (TWI) radar has been given increasing attention in recent years. However, prior knowledge about environmental parameters, such as wall thickness and dielectric constant, and the standoff distance between an array and a wall, is ...
Hu, Jun, Jin, Tian, Lu, Biying, Song, Yongping, Zhou, Zhimin   +4 more
core   +1 more source

Real-time programmable acoustooptic synthetic aperture radar processor [PDF]

, 1988
The acoustooptic time-and-space integrating approach to real-time synthetic aperture radar (SAR) processing is reviewed, and novel hybrid optical/electronic techniques, which generalize the basic architecture, are described.
Haney, Michael, Psaltis, Demetri
core   +1 more source

Mapping Spatiotemporal Variations of Near‐Surface Seismic Velocity to Monitor Groundwater in Central Oklahoma

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract Global climate changes have intensified drought events, necessitating accurate groundwater monitoring. Traditional methods often lack the spatial and temporal resolution to track groundwater variations. This study calculates instantaneous travel‐time shifts, dt(t) $dt(t)$, from ambient noise cross‐correlation functions in central Oklahoma and ...
Shuo Zhang, Bingxu Luo, Yujie Zheng, David Lumley, Mrinal K. Sen, Hejun Zhu   +5 more
wiley   +1 more source