Results 31 to 40 of about 8,325 (213)

Multicolor and multi-spot observations of Starlink’s Visorsat

Publications of the Astronomical Society of Japan, 2023
Abstract This study provides the results of simultaneous multicolor observations for the first Visorsat (STARLINK-1436) and the ordinary Starlink satellite (STARLINK-1113) in the U, B, V, g′, r, i, RC, IC, $z$, J, H, and Ks bands to quantitatively investigate the extent to which Visorsat reduces its reflected light.
Takashi Horiuchi, Hidekazu Hanayama, Masatoshi Ohishi, Tatsuya Nakaoka, Ryo Imazawa, Koji S Kawabata, Jun Takahashi, Hiroki Onozato, Tomoki Saito, Masayuki Yamanaka, Daisaku Nogami, Yusuke Tampo, Naoto Kojiguchi, Jumpei Ito, Masaaki Shibata, Malte Schramm, Yumiko Oasa, Takahiro Kanai, Kohei Oide, Katsuhiro L Murata, Ryohei Hosokawa, Yutaka Takamatsu, Yuri Imai, Naohiro Ito, Masafumi Niwano, Seiko Takagi, Tatsuharu Ono, Vladimir V Kouprianov   +27 more
openaire   +2 more sources

Digital Twin‐Based Optimization of Service Availability in LEO Mega Constellations Considering Handover Delays in Open RAN

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT As non‐terrestrial networks (NTNs) become integral to future 6G systems, ensuring seamless connectivity and service continuity over low Earth orbit (LEO) satellite constellations is essential. This work investigates the impact of open radio access network (RAN) functional splits on handover performance in NTNs, focusing on minimizing service ...
Siva Satya Sri Ganesh Seeram, Luca Feltrin, Mustafa Ozger, Cicek Cavdar   +3 more
wiley   +1 more source

The Parameters Comparison of the “Starlink” LEO Satellites Constellation for Different Orbital Shells

Frontiers in Communications and Networks, 2021
Communications-integrated satellite-terrestrial networks used for global broadband services have gained a high degree of interest from scientists and industries worldwide.
Shkelzen Cakaj, Shkelzen Cakaj
doaj   +1 more source

Integrated LEO Constellation and In‐Cabin Distribution System for Continuous Aircraft 5G Connectivity

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT The integration of low Earth orbit (LEO) satellite constellations with commercial aircraft communication systems presents critical challenges in maintaining continuous connectivity during dynamic flight conditions. Current geostationary satellite systems suffer from high round‐trip latency (>$$ > $$ 500 ms) and inadequate coverage at high ...
Raúl Parada, Victor Monzon Baeza, Carlos Horcajo Fernández de Gamboa, Rocío Serrano Camacho, Carlos Monzo   +4 more
wiley   +1 more source

Application Status and Analysis of Starlink Constellation

天地一体化信息网络, 2023
Starlink, asatellite broadband constellation operated by SpaceX, is currently the most influential and promising LEO broadband satellite constellation.With the expansion of the constellation deployment, its high-frequency launch and batch deployment of ...
Yu WANG, Qing LI, Kejun LI, Changlin JIANG, Ye WANG, Yong JIANG, Mingwei XU   +6 more
doaj   +2 more sources

Monitoring wildlife using long‐endurance solar‐electric UAVs

Wildlife Biology, EarlyView.
This report discusses the effectiveness of using small solar‐electric UAV (uncrewed aerial vehicles) for aerial wildlife monitoring. We review four years of aerial wildlife monitoring missions using a 5.5‐m wingspan, solar‐electric UAV that was equipped with a gimballed IR/RGB camera.
Götz Bramesfeld, William Bissonnette, Maya Rahaman‐Noronha, Kanwar Johal   +3 more
wiley   +1 more source

Starlink’s Provision of Telecommunication Services During the Time of Armed Conflict and Its Consequences from the Perspective of Public International Law

Acta Universitatis Lodziensis Folia Iuridica
This article attempts to provide an overview of the most important international regulations relating to the provision of telecommunication services by private companies to one or more belligerent parties in times of an armed conflict.
Bartłomiej Gerałt
doaj   +1 more source

EU Space Governance at the Threshold of A New Era

Global Policy, EarlyView.
ABSTRACT This introductory article to the special issue “EU Space Governance at the Threshold of a New Era” explores the European Union's evolving role as a strategic actor in space. It argues that the EU is undergoing a fundamental shift from a regulatory to a security‐oriented approach, driven by institutional consolidation, technological ambition ...
Philip De Man, Jan Wouters
wiley   +1 more source

Further Wolf-Rayet stars in the starburst cluster Westerlund 1 [PDF]

, 2005
We present new low and intermediate-resolution spectroscopic observations of the Wolf Rayet (WR) star population in the massive starburst cluster Westerlund 1.
Bernabei, Clark, Clark, Crowther, Figer, Figer, Genzel, Homeier, Horrobin, I. Negueruela, J. S. Clark, Maillard, Massey, Meynet, Smith, van der Hucht, Vreux, Vreux, Westerlund   +18 more
core   +3 more sources

Rendezvous in Space: Tech Diplomacy and the Commercial Space Era—A Study of Rendezvous and Docking Technologies and Space Exploration Co‐Operation Since the Cold War

Global Policy, EarlyView.
ABSTRACT On‐orbit rendezvous and docking constitute one of the most technically challenging activities in the history of space activities. As space endeavours mature to crewed missions, space rendezous and docking technologies (RDT) emerge as an area of technological innovation critical to advances in future crewed space exploration.
Nikita Chiu, Markus Kornprobst
wiley   +1 more source