Results 1 to 10 of about 820 (136)

Turbulence spectrum model and fiber-coupling efficiency in the anisotropic non-Kolmogorov satellite-to-ground downlink

open access: yesResults in Physics, 2021
Increasing experimental and theoretical results have confirmed that the anisotropy of turbulence cells cannot be ignored in the atmospheric turbulence. The satellite-to-ground downlink is the important part of satellite optical communication network, so ...
Chao Zhai
doaj   +3 more sources

Atmospheric Effects on Satellite–Ground Free Space Uplink and Downlink Optical Transmissions

open access: yesApplied Sciences, 2022
Free space optical (FSO) communications have the potential to be one of the most essential technologies for solving the high-bandwidth demands of communications between satellites and ground stations.
Nilesh Maharjan   +2 more
doaj   +3 more sources

A Simulated Annealing Algorithm with Tabu List for the Multi-Satellite Downlink Schedule Problem Considering Waiting Time

open access: yesAerospace, 2022
In the multi-satellite and multi-ground station downlink task scheduling problem, the waiting time from the proposal of the task to the execution will affect its validity.
Yan Liu, Shengyu Zhang, Haiying Hu
doaj   +1 more source

Exploiting potentialities for space-based quantum communication network: downlink quantum key distribution modelling and scheduling analysis

open access: yesNew Journal of Physics, 2023
The goal of the space-based quantum network is to form the backbone of the quantum internet for long-distance secure data transfer, networked distributed quantum information processing, and other applications.
Xingyu Wang   +6 more
doaj   +1 more source

Enhanced Uplink Quantum Communication With Satellites via Downlink Channels

open access: yesIEEE Transactions on Quantum Engineering, 2021
In developing the global quantum Internet, quantum communication with low-earth-orbit satellites will play a pivotal role. Such communication will need to be two way: effective not only in the satellite-to-ground (downlink) channel but also in the ground-
Eduardo Villasenor   +4 more
doaj   +1 more source

Effect of polarization on the link dynamics of a spinning low‐earth orbits satellite aligned with geomagnetic field

open access: yesEngineering Reports, 2021
This paper discusses the dynamic communication link aspects of IIT Madras student Satellite (IITMSAT). It is a Low‐Earth Orbits satellite which has limited Attitude Determination and Control System (ADCS) ability to align one of its body axes with the ...
Rajavardhan Talashila   +1 more
doaj   +1 more source

Analysis of a Low-Earth Orbit Satellite Downlink Considering Antenna Radiation Patterns and Space Environment in Interference Situations

open access: yesRemote Sensing, 2023
This paper investigates a low-Earth orbit (LEO) satellite downlink for high-speed data communication in interference situations. A choke ring horn type antenna is used as the data transmitting antenna with an isoflux pattern in the LEO satellite, which ...
Eunjung Kang   +6 more
doaj   +1 more source

Q-Band LEO Earth Observation Data Downlink: Radiowave Propagation and System Performance

open access: yesIEEE Access, 2021
Earth Exploration Satellite Service (EESS) systems gather data about the Earth and its natural phenomena. Frequency bands traditionally employed by high-rate telemetry to download data from the satellite to the ground station, such as the X band (8 GHz),
Felix Cuervo   +3 more
doaj   +1 more source

Towards Federated Satellite Systems and Internet of Satellites: The Federation Deployment Control Protocol

open access: yesRemote Sensing, 2021
Presently, the Earth Observation community is demanding applications that provide low latency and high downlink capabilities. An increase in downlink contacts becomes essential to meet these new requirements.
Joan A. Ruiz-de-Azua   +4 more
doaj   +1 more source

Performance Analysis of Large-Scale NGSO Satellite-Based Radio Astronomy Systems

open access: yesIEEE Access, 2021
Large-scale non-geostationary orbit (NGSO) satellite communication systems (SCSs) are emerging to play an important role for future global wireless communication.
Zhixuan Fan, Yucheng Dai, Hlaing Minn
doaj   +1 more source

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