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Variable Data Rate for Free Space optical Low Earth orbit Downlinks (OLEODL)

Shrestha, Amita and Giggenbach, Dirk and Hanik, Norbert (2018) Variable Data Rate for Free Space optical Low Earth orbit Downlinks (OLEODL). In: International Conference on Transparent Optical Networks. ICTON 2018, 02-05 July 2018, Bucharest, Romania.

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Abstract

Low-Earth-orbit (LEO) satellites for Earth observation have typical orbit altitudes of 400 to 600km. Since their on-board sensors resolution is advancing, the need for very high rate satellite downlinks is increasing into the range of several gigabits per second. Free-space optical communications is ideal for such applications, as it offers very high data rate, while allowing smaller satellite terminals and avoiding spectral regulation constraints. However, the key challenges in optical LEO downlinks (OLEODL) are the varying free space loss due to distance changes during a downlink contact, atmospheric attenuation, and the fast signal scintillation due to atmospheric index-of-refraction turbulence (IRT). This paper will briefly explain OLEODL technology, its challenges, and suitable mitigation techniques. The paper will focus on why varying the data rate according to channel state is important for OLEODL and how it can be achieved

Item URL in elib:https://elib.dlr.de/120824/
Document Type:Conference or Workshop Item (Speech)
Title:Variable Data Rate for Free Space optical Low Earth orbit Downlinks (OLEODL)
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Shrestha, Amitaamita.shrestha (at) dlr.deUNSPECIFIED
Giggenbach, DirkDirk.Giggenbach (at) dlr.deUNSPECIFIED
Hanik, Norbertnorbert.hanik (at) tum.deUNSPECIFIED
Date:3 July 2018
Journal or Publication Title:International Conference on Transparent Optical Networks
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:KNOGSOP, Variable data rate, FSO, OLEODL, LEO downlinks, VarDR
Event Title:ICTON 2018
Event Location:Bucharest, Romania
Event Type:international Conference
Event Dates:02-05 July 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication and Navigation
DLR - Research area:Raumfahrt
DLR - Program:R KN - Kommunikation und Navigation
DLR - Research theme (Project):R - Projekt PROSIRIS
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Satellite Networks
Deposited By: Shrestha, Amita
Deposited On:17 Jul 2018 10:22
Last Modified:31 Jul 2019 20:18

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