Results 101 to 110 of about 47,957 (238)

Contributo para o estabelecimento de uma rede permanente GNSS para monitorização dos sistemas vulcânicos ativos do arquipélago dos Açores [PDF]

, 2015
Dissertação de Mestrado, Vulcanologia e Riscos Geológicos, 17 de Novembro de 2015, Universidade dos Açores.O trabalho apresentado no âmbito desta tese foca-se no estudo da deformação crustal em sistemas vulcânicos ativos, através da aplicação da técnica ...
Araújo, João Pedro Martins Teixeira
core  

Quantum Protocol Architectures and Secure Control Frameworks For 7G+ Networks: Standards, Synchronization, Use Cases, and Challenges

Advanced Quantum Technologies, Volume 9, Issue 5, May 2026.
ABSTRACT Quantum‐native communication systems are reshaping secure, programmable, and coherence‐aware networking beyond the classical paradigm. As intelligent physical infrastructures, ranging from unmanned aerial vehicle swarms to satellite Quantum Key Distribution (QKD) platforms, demand trust, synchronization, and ultra‐reliability, conventional ...
Shakil Ahmed, Ibrahim Almazyad, Ashfaq Khokhar   +2 more
wiley   +1 more source

Mapping River Bed Topography in Whitewater Rapids Using Bathymetric LiDAR

River Research and Applications, Volume 42, Issue 4, Page 886-900, May 2026.
ABSTRACT Bathymetric LiDAR captures river topography efficiently for clear and shallow water, but for mountain rivers, whitewater rapids still pose challenges. This study proposes a novel method to enable the extraction of bottom returns specifically in turbulent whitewater sections.
Jan Rhomberg‐Kauert, Theresa Himmelsbach, Florian Pöppl, Lucas Dammert, Martin Pfennigbauer, Gottfried Mandlburger   +5 more
wiley   +1 more source

Location‐Assisted Graph‐Based User Scheduling in Multi‐User MIMO LEO NTN Systems

International Journal of Satellite Communications and Networking, Volume 44, Issue 3, Page 275-287, May/June 2026.
ABSTRACT This paper addresses user clustering and scheduling for multi‐user MIMO low Earth orbit nonterrestrial network systems in full frequency reuse. Since the number of on‐ground user terminals is usually much higher than the number of on‐board LEO satellite antennas, user scheduling becomes a fundamental task.
Bilal Ahmad, Daniel Gaetano Riviello, Bruno De Filippo, Alessandro Guidotti, Alessandro Vanelli‐Coralli   +4 more
wiley   +1 more source

A Hybrid Drone SINS/GNSS Information Fusion Method Based on Attention-Augmented TCN in GNSS-Denied Environments

Remote Sensing
In the field of drone navigation systems, a high-precision positioning solution can be provided by an integrated strapdown inertial navigation system (SINS)/global navigation satellite system (GNSS).
Chuan Xu, Shuai Chen, Daxiang Zhao, Zhikuan Hou, Changhui Jiang   +4 more
doaj   +1 more source

Climatic Higher‐Order Balanced Winds Beyond Geostrophic and Gradient Wind Fields

Earth and Space Science, Volume 13, Issue 5, May 2026.
Abstract We present a novel approach to derive three‐dimensional Climatic Higher‐Order Balanced (CHOB) wind fields from thermodynamic state variables in the free troposphere and stratosphere. The CHOB method is developed for monthly synoptic‐scale wind field estimation, utilizing commonly used balanced winds (geostrophic and gradient wind) enhanced by ...
I. Nimac, J. Unegg, J. Danzer
wiley   +1 more source

Universality and Realistic Extensions to the Semi-Analytic Simulation Principle in GNSS Signal Processing [PDF]

, 2012
Semi-analytic simulation principle in GNSS signal processing bypasses the bit-true operations at high sampling frequency. Instead, signals at the output branches of the integrate&dump blocks are successfully modeled, thus making extensive Monte Carlo ...
Jakubov, O., Kacmarik, P., Kovar, P., Vejrazka, F.   +3 more
core   +1 more source

Observation and Coordination Needs for Current, Near‐Future, and Next Generation Earth‐Observing SAR Systems

Earth and Space Science, Volume 13, Issue 5, May 2026.
Abstract This paper summarizes an evaluation by experts of how coordination of Earth‐observing Synthetic Aperture Radar (SAR) missions among the world's space agencies could advance toward game‐changing scientific discoveries and fully realizing SAR's practical capability to address many issues facing society.
Cathleen E. Jones, Ake Rosenqvist, Björn Rommen, Magdalena Fitrzyk, Eric Rignot, Bernd Scheuchl, Yujie Zheng, Andrew Hooper, Mark Simons, Tomokazu Kobayashi, Paul Siqueira, Maurizio Santoro, Takeo Tadono, Laura Hess, Heather McNairn, Laura Frulla, Malin Johansson, Wolfgang Dierking, Line Rouyet, Annett Bartsch, Paco Lopez Dekker, Johnny A. Johannessen   +21 more
wiley   +1 more source

Shipboard Marine Gravimeters Operated on Vessels in the U.S. Academic Research Fleet: Capabilities and Data Quality

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 5, May 2026.
Abstract Shipboard gravity anomaly data provide high‐resolution information for a wide range of Earth and ocean science research as well as ground‐truthing US national geodetic modeling. Motivated by the end of life‐cycle for legacy Bell aerospace marine Gravity Meter system (BGM‐3) gravimeters onboard vessels in the U.S. Academic Research Fleet, a new
Jyun‐Nai Wu, Masako Tominaga, Hannah Mark, Jian Zhu, Daniel Fornari, Maurice Tivey, Thomas Lanagan, Steve Faluotico, Eric Hayden, Marissa Small, Daniel Aliod, Nigel Brady, Alicia Metzger, Potential Field Pool Equipment program   +13 more
wiley   +1 more source

GNSS and LiDAR Integrated Navigation Method in Orchards with Intermittent GNSS Dropout

Applied Sciences
Considering the vulnerability of satellite positioning signals to obstruction and interference in orchard environments, this paper investigates a navigation and positioning method based on real-time kinematic global navigation satellite system (RTK-GNSS),
Yilong Li, Qingchun Feng, Chao Ji, Jiahui Sun, Yu Sun   +4 more
doaj   +1 more source