Results 31 to 40 of about 18,596 (191)
Photonics, 2022 By analyzing the effect of the degree of polarization (DoP) of the partially coherent Gaussian Schell-model (GSM) beam on a heterodyne system of an uplink path and a downlink path, we developed an innovative and noteworthy theory according to which σsy ...
Zhenkun Tan +4 more
doaj +1 more source
Optical Satellite Downlinks to Optical Ground Stations and High-Altitude Platforms
, 2007 Earth-observation (EO) satellite missions using highresolution optical or radar sensors are producing an immense amount of data which needs to be send down to earth.
Giggenbach, Dirk +5 more
core +1 more source
Cooperative Reception of Multiple Satellite Downlinks
Sensors, 2022 Popular small satellites host individual sensors or sensor networks in space but require ground stations with directional antennas on rotators to download sensors’ data.
Haidar N. Al-Anbagi, Ivo Vertat
doaj +1 more source
MOBILE OPTICAL HIGH-SPEED DATA LINKS WITH SMALL TERMINALS
, 2009 Mobile Optical Free-Space Communication (MFSO) downlinks from observation platforms in low earth orbit or in the atmosphere will allow nearly undetectable high-speed data links with small and low-power laser communication terminals.
Giggenbach, Dirk, D. Giggenbach
core +1 more source
PhotonicsSecurity is paramount in space–air–ground integrated networks (SAGINs) due to their inherent openness and the broadcast characteristics of wireless transmission. In this paper, we propose a secure downlink transmission scheme with NOMA-based mixed FSO/RF
Yu Li +4 more
doaj +1 more source
Optical Free-Space Communication on Earth and in Space regarding Quantum Cryptography Aspects
, 2010 Mobile FSO Communication links have gained signi cant at- tention over the last years due to their increasing maturity. They are used in point to point link scenarios where the high gain in power efficiency and datarate is crucial, compared to state-of ...
Fuchs, Christian +3 more
core +1 more source
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 +3 more
wiley +1 more source
Performance Analysis of DPSK Optical Communication for LEO-to-Ground Relay Link Via a GEO Satellite
Journal of Astronomy and Space Sciences, 2020 Satellite optical communication has gained significant attention owing to its many quality features (e.g., a larger bandwidth, license free spectrum, higher data rate, and better security) compared to satellite microwave communication.
Hyung-Chul Lim +5 more
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, 2007 Optical LEO downlinks from the Japanese OICETS to the optical ground station built by the German Aerospace Center (DLR) near Munich have been performed. This was the first optical LEO downlink on European grounds.
Perlot, Nicolas +13 more
core +1 more source
Analysis and evaluation of optimum wavelengths for free-space optical transceivers [PDF]
, 2010 The objective of this paper is to analyse and present the latest results obtained for free-space optics (FSO) within the EU COST Action IC-0802 and within the European Space Agency (ESA) contract.
Z. Ghassemlooy +15 more
core +1 more source