Results 71 to 80 of about 6,499 (253)

Tackling ionospheric scintillation threat to GNSS in Latin America

Journal of Space Weather and Space Climate, 2011
Scintillations are rapid fluctuations in the phase and amplitude of transionospheric radio signals which are caused by small-scale plasma density irregularities in the ionosphere.
Monico Joao Francisco Galera, Bougard Bruno, Romano Vincenzo, Spogli Luca, Alfonsi Lucilla, De Franceschi Giorgiana, Hancock Craig, Elmas Zeynep, Forte Biagio, Aquino Marcio, Sreeja Vadakke Veettil, Wernik Andrzej W., Sleewaegen Jean-Marie, Cantó Andrea, Ferreira Da Silva Elcia   +14 more
doaj   +1 more source

Tracing Three Decades of Low Earth Orbit Satellite Communication Development: A Bibliometric and Main Path Analysis of Network Architectures, Protocol Evolution, and Emerging Intelligent Services

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite communication systems have evolved into a critical component of global broadband networks, enabling wide‐area connectivity, IoT services, and intelligent multilayer satellite–terrestrial integration. Despite rapid advancements in constellation deployment, routing mechanisms, resource management, and LEO–5G/6G ...
Wei‐Hao Su, Ya‐Chen Chuang, Long‐Sheng Chen   +2 more
wiley   +1 more source

Fundamentals and Applications of GNSS Reflectometry

This open access book presents the fundamental methods and applications of GNSS-reflected signal reception processing. On the basis of systematic analysis of GNSS signals, it delves into the typical characteristics of signals after reflection, discussing the software and hardware design of GNSS-reflected signal receivers from different perspectives ...
Dongkai Yang, Feng Wang
openaire   +2 more sources

Low‐Complexity Hybrid Beamforming for LEO Satellites: Beam Update Rate Analysis and Advanced Adaptive Precoding

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Low Earth Orbit (LEO) satellite constellations offer unprecedented opportunities for global broadband connectivity but pose significant beamforming challenges due to rapid platform motion and stringent onboard hardware constraints. Fully digital architectures, while optimal in theory, remain impractical for satellite payloads, motivating ...
Mohammad Momani, Thomas Delamotte, Andreas Knopp   +2 more
wiley   +1 more source

Global Navigation Satellite Systems Reflectometry as a Remote Sensing Tool for Agriculture

Remote Sensing, 2012
The use of Global Navigation Satellite Systems (GNSS) signals for remote sensing applications, generally referred to as GNSS-Reflectometry (GNSS-R), is gaining increasing interest among the scientific community as a remote sensing tool for land ...
Alejandro Egido, Marco Caparrini, Giulio Ruffini, Simonetta Paloscia, Emanuele Santi, Leila Guerriero, Nazzareno Pierdicca, Nicolas Floury   +7 more
doaj   +1 more source

Dynamic Cell Division for Interference Management in Satellite Direct‐to‐Cell Systems

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT Direct‐to‐cell (D2C) connectivity enables future non‐terrestrial networks to provide service directly to standard terrestrial user equipment (UE) when terrestrial networks (TN) are unavailable. In this work, the satellite system is considered as a secondary network that supplements existing TN coverage while minimizing interference to the ...
Satya Chan, Hee Wook Kim, Bon‐Jun Ku, Daesub Oh   +3 more
wiley   +1 more source

Sampling, Mobility, and Anchoring in Small‐Body Sampling Robots: A Comprehensive Review

SmartBot, EarlyView.
Small‐body sampling robots are exploration systems that perform contact, sampling, and stable operations on microgravity bodies such as asteroids and comets. The authors review representative robot architectures and key technologies, focusing on the mechanisms, evolution, and coupling of sampling, mobility, and anchoring.
Yurui Shen, Yixin Zhu, Mingxia Bao, Ting Zhang, Jun Wu, Jingbin Hao, Dezheng Hua, Xinhua Liu   +7 more
wiley   +1 more source

Bifunctional Electrocatalysts in Rechargeable Lithium‐Gas Batteries: Material Evolution and Mechanistic Insights from Metal‐Free Carbons to Carbon‐Supported Single‐Atom Sites

Small, EarlyView.
This review charts the material evolution of bifunctional electrocatalysts for rechargeable lithium‐gas batteries. It highlights the journey from heteroatom‐doped, metal‐free carbon architectures to precision‐engineered carbon‐supported single‐atom sites. The discussion focuses on mechanistic insights into how these catalysts govern reversible O2, CO2,
Daming Ren, Shuimei Chen, Yuzheng Wu, Xiaodan Huang, Jong Beom Baek, Ashok Kumar Nanjundan   +5 more
wiley   +1 more source

Continuity of GNSS as a critical attribute for safety applications in land transport

Scientific Reports
The Global Navigation Satellite System (GNSS) is widely used for air traffic management—more than 150,000 aircraft and 5000 airports worldwide are equipped with SBAS (Satellite-based augmentation system) technology, which contributes to safer and more ...
Aleš Filip, Francesco Rispoli
doaj   +1 more source

A Fourier-Based Image Formation Algorithm for Geo-Stationary GNSS-Based Bistatic Forward-Looking Synthetic Aperture Radar

Sensors, 2019
A Geo-Stationary GNSS-based Bistatic Forward-Looking Synthetic Aperture Radar (GeoSta-GNSS-BFLSAR) system is a particular kind of passive bistatic SAR system.
Zhangfan Zeng, Zhiming Shi, Sainan Xing, Yongcai Pan   +3 more
doaj   +1 more source