Results 81 to 90 of about 123,093 (174)

Assessment of Practical Satellite Quantum Key Distribution Architectures for Current and Near‐Future Missions

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 164-192, May/June 2025.
ABSTRACT Quantum key distribution (QKD) allows the generation of cryptographic keys beyond the computational hardness paradigm and is befitting for secure data transmission requiring long‐term security. The communication distance of fiber‐based QKD, however, is limited to a few hundred kilometers due to the exponential scaling of signal attenuation ...
Davide Orsucci, Philipp Kleinpaß, Jaspar Meister, Innocenzo De Marco, Stefanie Häusler, Thomas Strang, Nino Walenta, Florian Moll   +7 more
wiley   +1 more source

The radio telescope RATAN 600 [PDF]

A six-meter radio antenna having 900 reflector elements arranged on a 579 -meter diameter circle and located in the northern part of the Caucasian Mountains is described. The elements are about 7.4 m by 2 m resulting in a total reflector surface of about
Schwartz, R.
core   +1 more source

Laser Terminals on CubeSats: Developments for Telecommunications and Quantum Links

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 133-146, May/June 2025.
ABSTRACT Satellite‐based laser communication is an emerging technology that is finding its way from research to industry. Compared to radio frequency (RF) systems, it has a more efficient size, weight, and power budget and, furthermore, is license free.
Christian Roubal, Till Dolejsky, Benjamin Rödiger, Fabian Rein, Jorge Rosano Nonay, René Rüddenklau, Christos Papadopoulos, Christopher Schmidt, Florian Moll   +8 more
wiley   +1 more source

Photonic Integrated Circuits for Optical Satellite Links: A Review of the Technology Status and Space Effects

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 210-228, May/June 2025.
ABSTRACT Optical satellite communications provide high‐data rates with compact and power efficient payloads that can solve the bottlenecks of RF technologies. Photonic integrated circuits have the potential to reduce the cost, size, weight, and power consumption of satellite laser communications terminals, by integrating all the required photonic ...
Giulio Terrasanta, Marcin Wojciech Ziarko, Nicola Bergamasco, Menno Poot, Juraj Poliak   +4 more
wiley   +1 more source

Accelerating Faceting Wide-Field Imaging Algorithm with FPGA for SKA Radio Telescope as a Vast Sensor Array. [PDF]

Sensors (Basel), 2020
Song Y, Zhu Y, Nan T, Hou J, Du S, Song S.   +5 more
europepmc   +1 more source

Statistics of Received Power Time Series for Optical LEO Satellite Uplinks

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 251-263, May/June 2025.
ABSTRACT In free‐space optical satellite communications, a transmitted optical signal is perturbed by pointing inaccuracies and through the atmosphere's index‐of‐refraction turbulence. This leads to signal fluctuations and power fading when detected by a receiver. Knowledge of these signal instability statistics is advantageous for the design of robust
Andrea Carrillo‐Flores, Dirk Giggenbach, Marcus T. Knopp   +2 more
wiley   +1 more source

Update on the German and Australasian Optical Ground Station Networks

International Journal of Satellite Communications and Networking, Volume 43, Issue 3, Page 147-163, May/June 2025.
ABSTRACT Networks of ground stations designed to transmit and receive at visible and infra‐red wavelengths through the atmosphere offer an opportunity to provide on‐demand, high‐bandwidth, secure communications with spacecraft in Earth orbit and beyond. This work describes the operation and activities of current free space optical communications (FSOC)
Nicholas J. Rattenbury, Joseph Ashby, Francis Bennet, Marcus Birch, John E. Cater, Kate Ferguson, Dirk Giggenbach, Ken Grant, Andreas Knopp, Marcus T. Knopp, Ed Kruzins, Andrew Lambert, Kerry Mudge, Catherine Qualtrough, Samuele Raffa, Jonas Rittershofer, Mikhael T. Sayat, Sascha Schediwy, Robert T. Schwarz, Matthew Sellars, Oliver Thearle, Tony Travouillon, Kevin Walker, Shane Walsh, Stephen Weddell   +24 more
wiley   +1 more source

In Situ Analysis of Jupiter's Broadband Kilometric Auroral Radio Emissions With Juno

Geophysical Research Letters, Volume 52, Issue 9, 16 May 2025.
Abstract Among the zoo of Jovian auroral radio emissions, the broadband kilometric (bKOM) component has been the least studied. Taking advantage of Juno in situ measurements within the auroral regions, we surveyed the Juno/Waves radio observations over the 60 first orbits to identify 7 bKOM source candidates.
B. Collet, L. Lamy, C. K. Louis, V. Hue, T. K. Kim   +4 more
wiley   +1 more source

Continuous Flow Technology Enabling Photochemistry

Advanced Synthesis &Catalysis, Volume 367, Issue 9, May 6, 2025.
Abstract The merger of continuous flow technology and modern photochemistry has enabled countless applications showcasing new opportunities for chemical synthesis demonstrating improvements in selectivity, safety, sustainability and scalability. This focused review aims to highlight a selection of recently published case studies from academic and ...
Ruairi Crawford, Marcus Baumann
wiley   +1 more source

Monitoring and Maintaining Laser Surface Texture Quality Based on Acoustic and Optical Process Emissions during Direct Laser Interference Patterning

Advanced Engineering Materials, Volume 27, Issue 9, May 2025.
Acoustic emissions during direct laser interference patterning are shown to strongly correlate with surface texture depth. By implementing a closed‐loop control system utilizing acoustic feedback, consistent microstructures with uniform depth are achieved despite laser power fluctuations.
Tobias Steege, Frederic Schell, Adrian Belkin, Christoph Zwahr, Andrés F. Lasagni   +4 more
wiley   +1 more source