Article
Engineering, Electrical & Electronic
Pietro Cassara, Alberto Gotta, Mario Marchese, Fabio Patrone
Summary: Mega-LEO satellite constellations are proving their feasibility and potential applications by providing worldwide internet access equality and offering the possibility of offloading computing tasks to an orbital edge platform, leading to improved performance.
IEEE COMMUNICATIONS MAGAZINE
(2022)
Article
Engineering, Electrical & Electronic
Guanming Zeng, Yafeng Zhan, Haoran Xie, Chunxiao Jiang
Summary: In this paper, a networked telemetry system is designed to meet the monitoring requirements of mega constellations in the upcoming 6G communication era. Data is transmitted through the inter-satellite-links of LEO and MEO satellites. The resource allocation problem is decomposed using the block coordinate descent method and effectively increases the transmitted data amount of the system.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Computer Science, Information Systems
Guanming Zeng, Yafeng Zhan, Haoran Xie
Summary: Recently, mega LEO satellite constellation plans have emerged to support future 6G satellite communications. A networked telemetry system is adopted for monitoring the operation status of all satellites, enabling full-time and low delay telemetry for mega LEO satellite constellations. This article proposes a channel allocation problem and develops algorithms to solve the path scheduling and channel allocation problems, improving the transmitted data amount and approximating the upper bound performance.
IEEE INTERNET OF THINGS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Kevin T. Li, Christian A. Hofmann, Harald Reder, Andreas Knopp
Summary: As part of New Space, low Earth orbit mega-constellations are becoming increasingly popular for delivering broadband Internet from space. The key to success lies in reducing satellite communication costs to provide access to everyone. This article presents a techno-economic assessment of constellation ownership costs and service delivery costs to customers. By exploring different trade-offs, the study identifies key performance indicators and their techno-economic relationship, showing that low-complexity satellites in low orbits offer the best cost-per-capacity performance. Valuable insights are provided for understanding and guiding design choices in such vast and complex systems.
IEEE COMMUNICATIONS MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Israel Leyva-Mayorga, Beatriz Soret, Petar Popovski
Summary: The future of wireless communications will heavily rely on dense satellite constellations deployed in low Earth orbit (LEO). While efforts to integrate satellites into 5G networks are promising, challenges such as dynamic inter-plane inter-satellite links need to be addressed. The proposed algorithms in this paper show significant improvements in both interference-free and worst-case scenarios for interference, increasing the sum of rates in the constellation by up to 115% and 71% respectively.
IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS
(2021)
Review
Computer Science, Information Systems
Ali Lalbakhsh, Andrew Pitcairn, Kaushik Mandal, Mohammad Alibakhshikenari, Karu P. Esselle, Sam Reisenfeld
Summary: The proliferation of low-earth orbit satellites and the LEO satellite internet will have a significant impact on the global internet. This article focuses on the satellite brightness issue caused by LEO constellations, which potentially affect astronomical studies. It reviews the underlying contributors to satellite brightness and discusses state-of-the-art technologies proposed to address this emerging challenge.
Article
Computer Science, Information Systems
Nasrin Razmi, Bho Matthiesen, Armin Dekorsy, Petar Popovski
Summary: This paper discusses the use cases of federated learning in Low Earth Orbit (LEO) mega constellations, specifically in satellite imaging inference. It proposes a new algorithm based on FedAvg that utilizes an asynchronous federated learning procedure, improving the robustness in heterogeneous scenarios. Extensive numerical evaluations using MNIST and CIFAR-10 datasets demonstrate the fast convergence speed and high test accuracy of the proposed method.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Computer Science, Information Systems
Shengyu Zhang, Kwan L. Yeung
Summary: This paper proposes a scalable two-layer routing architecture to address the dynamic nature of low-Earth orbit satellite constellations (LEO-SCs). Two stable routing algorithms are designed to minimize route changes.
COMPUTER COMMUNICATIONS
(2022)
Article
Environmental Sciences
Junqi Guo, Yang Wang, Chenyang Sun
Summary: This study aims to solve the optimal positioning configuration problem for large-scale satellite selection using a genetic algorithm and proposes a new positioning configuration formula. The research finds that the traditional recursive algorithm is not applicable in large-scale constellations, while the proposed formula has a similar accuracy to the Quasi-Optimal algorithm when there is no signal occlusion and the satellites are uniformly selected, effectively overcoming accuracy loss under signal occlusion.
Article
Engineering, Electrical & Electronic
Yong Lu, Youjian Zhao, Fuchun Sun, Faquan Yang, Ruishi Liang, Jun Shen, Zhihong Zuo
Summary: This paper proposes structural optimization methods for Two-Layered Satellite Networks (TLSNs) to enhance the transmission efficiency of Mega-constellation LSNs. The proposed methods not only effectively improve the transmission efficiency, but also increase the duration time of Inter-Layer Links (ILLs) and reduce the topological dynamics of TLSNs.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Computer Science, Information Systems
Hikaru Tsuchida, Yuichi Kawamoto, Nei Kato, Kazuma Kaneko, Shigenori Tani, Masatake Hangai, Hiroshi Aruga
Summary: In this study, a communication method that controls the transmission power and transmission gain of a satellite antenna based on the deterioration state of the battery is developed to increase the battery's lifetime. The reduction in running costs following the prolongation of the battery's lifetime will allow the development and use of large-scale LEO satellite constellations. The effectiveness of the proposed method is verified through simulation.
IEEE TRANSACTIONS ON EMERGING TOPICS IN COMPUTING
(2022)
Article
Computer Science, Information Systems
Gaofeng Pan, Jia Ye, Jianping An, Mohamed-Slim Alouini
Summary: Large low earth orbit (LEO) mega-constellation systems are deployed to provide global connectivity, but setting up long-distance connections with low latency is challenging due to high traffic load/congestion. Introducing third-party relays can improve latency performance for wide-area real-time traffic, but it degrades signal reliability. This work analyzes an LEO satellite-terrestrial communication scenario and investigates end-to-end time delay and outage performance under different relay-assisted transmission scenarios, considering the randomness of user and relay positions.
IEEE TRANSACTIONS ON MOBILE COMPUTING
(2023)
Article
Engineering, Aerospace
Yonghwa Lee, Jihwan P. Choi
Summary: The article examines the impact of changes in the number of satellites and adoption of optical intersatellite links in mega-constellation architectures, proposing a novel design approach for a time-varying visibility matrix to address the issue more effectively.
IEEE TRANSACTIONS ON AEROSPACE AND ELECTRONIC SYSTEMS
(2021)
Article
Engineering, Aerospace
Nathan Reiland, Aaron J. Rosengren, Renu Malhotra, Claudio Bombardelli
Summary: The paper introduces a method for evaluating and mitigating collision risk during the design process of mega-constellations, using a novel algorithm and numerical simulations. The results demonstrate that adopting MiSO orbital configurations can significantly reduce the risk of endogenous collisions.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Engineering, Electrical & Electronic
Keke Ying, Zhen Gao, Sheng Chen, Mingyu Zhou, Dezhi Zheng, Symeon Chatzinotas, Bjorn Ottersten, H. Vincent Poor
Summary: In this paper, we investigate the random access problem in massive multiple-input multiple-output (MIMO)-based low earth orbit (LEO) satellite systems. We propose a training sequence padded multi-carrier system to overcome imperfect synchronization at edge satellite nodes. The orthogonal approximate message passing-multiple measurement vector algorithm is used to estimate delay coefficients and user terminal activity considering the sparsity of terrestrial-satellite links and sporadic traffic feature of IoT terminals.
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
(2023)
Editorial Material
Multidisciplinary Sciences
Aaron Boley, Michael Byers
Article
Astronomy & Astrophysics
A. G. Hughes, A. C. Boley, R. A. Osten, J. A. White, M. Leacock
Summary: Despite expectations, low-mass ultracool dwarfs have been observed to produce significant radio emission. Our study reveals that the 97.5 GHz emission in UCDs exhibits characteristics of gyrosynchrotron radiation.
ASTRONOMICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Samantha M. Lawler, Aaron C. Boley, Hanno Rein
Summary: Megaconstellations of artificial satellites are being rapidly developed and launched, posing negative consequences for observational astronomy research and naked-eye stargazing. This study predicts the brightness and distribution of several satcons, and highlights their significant impact on the night sky worldwide if no mitigation efforts are made.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Jessica Klusmeyer, A. Meredith Hughes, Luca Matra, Kevin Flaherty, Agnes Kospal, Attila Moor, Aki Roberge, Karin Oberg, Aaron Boley, Jacob White, David Wilner, Peter Abraham
Summary: Strong CO emissions have been observed from several debris disks around main-sequence stars, but their origin remains unclear. This study conducts a deep search for five molecules in a debris disk to understand the material's origin, finding abundances relative to CO significantly lower than those in protoplanetary disks and solar system comets.
ASTROPHYSICAL JOURNAL
(2021)
Article
Astronomy & Astrophysics
Aaron C. Boley, Ewan Wright, Samantha Lawler, Paul Hickson, Dave Balam
Summary: This study presents observations of 23 Starlink satellites in the g' bandpass, revealing differences in brightness between satellites with and without brightness mitigation measures. The results show that the satellites with visors have slightly dimmer brightness compared to those without visors. Additionally, the study finds that the two brightest satellites have similar brightness levels, with one having a visor and the other being nonvisored. Overall, the study highlights the small intrinsic brightness dispersion among the sampled satellites.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Michael Byers, Ewan Wright, Aaron Boley, Cameron Byers
Summary: Each uncontrolled rocket body in orbit poses a low casualty risk on reentry, but the cumulative risk disproportionately borne by the Global South. Recent technological advancements make most of these uncontrolled reentries unnecessary, however, reluctance from launching states and companies to bear the increased costs result in risks being exported to other countries.
Article
Astronomy & Astrophysics
Simone R. Hagey, Billy Edwards, Aaron C. Boley
Summary: We analyze citizen science data to identify evidence of deviations from a constant orbital period in eight hot Jupiter systems. The results serve as an independent analysis, with some systems having disputed period drifts in the literature. The study discusses prioritization of follow-up investigations to confirm the period drifts and their causes.
ASTRONOMICAL JOURNAL
(2022)
Article
Astronomy & Astrophysics
Thomas Y. Steiman-Cameron, Richard H. Durisen, Aaron C. Boley, Scott Michael, Karna Desai, Caitlin R. McConnell
Summary: During the early phases of a protoplanetary disk's life, gravitational instabilities (GIs) play a crucial role in various aspects including mass transport, disk structure alteration, gas and solids mixing and shock processing, and planet formation. Through a 3D radiative hydrodynamics study, we have discovered that there is a balance between heating produced by GIs and radiative cooling, with distinct differences in physical and thermal processes in different regions of the disk.
ASTROPHYSICAL JOURNAL
(2023)
Article
Astronomy & Astrophysics
Aaron C. Boley, Christa Van Laerhoven, A. P. Granados Contreras
ASTRONOMICAL JOURNAL
(2020)
Article
Astronomy & Astrophysics
A. G. Hughes, A. C. Boley, R. A. Osten, J. A. White
ASTROPHYSICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Jacob Aaron White, J. Aufdenberg, A. C. Boley, M. Devlin, S. Dicker, P. Hauschildt, A. G. Hughes, A. M. Hughes, B. Mason, B. Matthews, A. Moor, T. Mroczkowski, C. Romero, J. Sievers, S. Stanchfield, F. Tapia, D. Wilner
ASTROPHYSICAL JOURNAL
(2019)
Article
Astronomy & Astrophysics
Jacob Aaron White, Jason Aufdenberg, A. C. Boley, Peter Hauschildt, Meredith Hughes, Brenda Matthews, David Wilner
ASTROPHYSICAL JOURNAL
(2018)
Article
Astronomy & Astrophysics
Jacob Aaron White, A. C. Boley
ASTROPHYSICAL JOURNAL
(2018)
Article
Astronomy & Astrophysics
Chuhong Mai, Steven J. Desch, Aaron C. Boley, Benjamin P. Weiss
ASTROPHYSICAL JOURNAL
(2018)