Results 221 to 230 of about 1,571,968 (246)

Injection Locking of Gigahertz‐Frequency Surface Acoustic Wave Phononic Crystal Oscillator

physica status solidi (a), EarlyView.
The compact surface‐acoustic‐wave phononic‐crystal oscillator is stabilized by injection locking it to an ultra‐stable reference. The injection locking suppresses the phase noise by 40 dB at low offset frequency region and reduces long‐term frequency drift from hundreds of hertz to 0.35 Hz, advancing portable, high‐performance timing and signal ...
Zichen Xi, Hsuan‐Hao Lu, Jun Ji, Bernadeta R. Srijanto, Ivan I. Kravchenko, Yizheng Zhu, Linbo Shao   +6 more
wiley   +1 more source

On the impact of observation‐error correlations in data assimilation, with application to along‐track altimeter data

Quarterly Journal of the Royal Meteorological Society, EarlyView.
We study the impact of observation‐error correlations in data assimilation using both a simple idealised system and a more realistic configuration. A spectral analysis of data assimilation in the idealised system allows us to gain insights on the effect of observation‐error correlations, which are then validated using the realistic configuration.
Olivier Goux, Anthony T. Weaver, Selime Gürol, Oliver Guillet, Andrea Piacentini   +4 more
wiley   +1 more source

AI‐Based Autonomous Sailboat Navigation: A Review

Journal of Field Robotics, EarlyView.
ABSTRACT This review explores the recent advancements in AI‐driven autonomous sailboat navigation, underscoring its pivotal role in ocean monitoring and real‐time maritime data collection. Drawing on an extensive range of primary and secondary sources, the study critically evaluates current challenges, innovative control algorithms, and path planning ...
Vishali Mankina, André P. D. Araújo, Raphael Guerra, Esteban W. G. Clua, Carlo Cernicchiaro, Luiz M. G. Gonçalves, Cosimo Distante   +6 more
wiley   +1 more source

Open letter: A global call to strengthen national soil biodiversity action through coordination and harmonization

PLANTS, PEOPLE, PLANET, EarlyView.
César Marín, Carlos Barreto, Brajesh K. Singh, Peter C. de Ruiter, George G. Brown, Jeff Battigelli, Gian Luca Bagnara, Rosalina González, Carlos Guerra, Xin Sun, Tara Dirilgen, Jacob Ulzen, Giulio Malorgio, Luca Montanarella, Claudia Coleine, Leena Vilonen, J. Jacob Parnell, Joseph Edwards, Heba Alfares, Gandhiv Kafle, Nasradeen A. H. Gadallah, Hannah Karuri, Arindam Roy, Edward Yeboah, Punyasloke Bhadury, David Kothamasi, Niraj Agarwala, Sukumar Debnath, Thilina Surasinghe, Frank Ashwood, Tushar Kumar, Pawan Kumar, Samina Siddiqui, Jane Gicheha, Petr Heděnec, Rachid Sabbahi, Jasper Wubs, Zhuang Ge, Andrey Zaitsev, Loris Galli, Sunil Mundra, Prabavathy Vaiyapuri Ramalingam, Kate Buckeridge, Partha Pratim Chakravorty, Raquel Juan‐Ovejero, Tobias Pfingstl, Samuel Eziuzor, David Elliott, Derrick Y. F. Lai, Sören Thiele‐Bruhn, Guille Peguero, Nandan Bhattacharyya, Samuel Bonnett, Isimemen Osemwegie, Davorka Hackenberger Kutuzović, Israel Ikoyi, Hamada Abdelrahman, Antonietta La Terza, Mourad Bendada, Konstantin Gongalsky, María Laura Moreno, Daniel Blackburn, Luís Carlos Iunes Oliveira Filho, Stefano Taiti, Maria Fernanda Cordova Hernandez, Leandro Fonseca de Souza, Ingeborg Klarenberg, Marta Novo, Matthieu Chauvat, Ana Ribeiro‐Barros, Kari E. Dunfield, Giuliana Shelly Lizana Flores, Sumit Rai, Shankar Ganapathi Shanmugam, Brett Hale, Dinesh Govindaraj Kamalam, Luis Wall, Maria J. I. Briones, Ji‐Zheng He, Rakesh Kumar, Reza Ghaderi, Radhika Sharma, María Gómez‐Brandón, Muhammad Imtiaz Rashid, Maria Pappas, Louise Egerton‐Warburton, Katalin Szlavecz, Luigimaria Borruso, Giulia Bongiorno, Christina Birnbaum, Samson Mang'oka, Raza Khan, Chiara Alisi, Levan Mumladze, Victoria Burton, Nasir Bashir Naikoo, Marc Dumont, Lidia Oktaba, Olaf Schmidt, El Hassan Mayad, Karin Jacobs, Chidozie Ernest, Dhananjaya Bhakthanakatte Chandrappa, Sol Santander‐Mendoza, Lenin Medina‐Orozco, Michael Schloter, Leigh Winowiecki, Erica Lumini, Cristina C. Bastias, Matthew Bakker, Laura Zucconi, Fabiana Canini, Maria Tsiafouli, Mohd Afzanizam Muda, Sud Sair Sierra, Raul Hernando Posada, Carlo Jacomini, Myo Thant, Deborah A. Neher, Anne Nurbaity, Maika Daveta, Robabeh Latif, Atabak Roohi Aminjan, Hilmar N. Thordarson, Moussa Tady Diallo, Becky Ball, Sina Adl, Zoë Lindo   +127 more
wiley   +1 more source

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Energy-Efficient RSMA for Multigroup Multicast and Multibeam Satellite Communications

IEEE Wireless Communications Letters, 2023
This letter studies energy-efficient rate-splitting multiple access (RSMA) for multigroup multicast and multibeam satellite communication systems. Specifically, we minimize the unmet system capacity, which means the rate difference between the requested ...
Huanxi Cui, Lipeng Zhu, Zhenyu Xiao, B. Clerckx, Rui Zhang   +4 more
semanticscholar   +1 more source

Robust Secure Transmission for Satellite Communications

IEEE Transactions on Aerospace and Electronic Systems, 2023
In recent years, satellite communications have become the focus of research on space–air–ground–sea integrated wireless communication networks because of their wide coverage.
Bin Jiang, Yingchun Yan, Li You, Jue Wang, Wen Wang, Xiqi Gao   +5 more
semanticscholar   +1 more source

Machine Learning and Deep Learning powered satellite communications: Enabling technologies, applications, open challenges, and future research directions

International Journal of Satellite Communications And Networking, 2023
The recent wave of creating an interconnected world through satellites has renewed interest in satellite communications. Private and government‐funded space agencies are making advancements in the creation of satellite constellations, and the ...
Arindam Bhattacharyya, Shvetha M. Nambiar, Ritwik Ojha, Amogh Gyaneshwar, Utkarsh Chadha, Kathiravan Srinivasan   +5 more
semanticscholar   +1 more source

Holographic MIMO for LEO Satellite Communications Aided by Reconfigurable Holographic Surfaces

IEEE Journal on Selected Areas in Communications, 2022
Ultra-dense low-Earth-orbit (LEO) satellite communication networks have significant potential for providing high-speed data services. To compensate the severe path loss in satellite communications, a key conceptual enabler is the holographic multiple ...
Ruoqi Deng, Boya Di, Hongliang Zhang, H. Poor, Lingyang Song   +4 more
semanticscholar   +1 more source

Space-Air-Ground FSO Networks for High-Throughput Satellite Communications

IEEE Communications Magazine, 2022
The next generation of satellite communication systems aims to achieve terabit-per-second throughput. Because of the limited spectrum available, traditional radio frequency (RF) communication links cannot provide such high throughput. Free-space optical (
Ramy Samy, Hong-Chuan Yang, Tamer Rakia, Mohamed-Slim Alouini   +3 more
semanticscholar   +1 more source

Multi-objective deep reinforcement learning based time-frequency resource allocation for multi-beam satellite communications

China Communications, 2022
Resource allocation is an important problem influencing the service quality of multi-beam satellite communications. In multi-beam satellite communications, the available frequency bandwidth is limited, users requirements vary rapidly, high service ...
Yuan-zhi He, Biao Sheng, Hao Yin, Di Yan, Yingchao Zhang   +4 more
semanticscholar   +1 more source