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TOWARDS THE UTILIZATION OF OPTICAL GROUND-TO-SPACE LINKS FOR LOW EARTH ORBITING SPACECRAFT

Knopp, Marcus Thomas and Spörl, Andreas and Gnat, Marcin and Rossmanith, Gregor Johannes and Huber, Felix and Fuchs, Christian and Giggenbach, Dirk (2018) TOWARDS THE UTILIZATION OF OPTICAL GROUND-TO-SPACE LINKS FOR LOW EARTH ORBITING SPACECRAFT. In: Proceedings of the International Astronautical Congress, IAC. International Astronautical Congress (IAC), 1.-5. Okt 2018, Bremen.

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Abstract

The microwave spectrum has become a highly limited resource in satellite communications owing to an ever increasing demand for bandwidth and capacity. Therefore, a shift to the exploitation of optical carrier frequencies is currently underway. Focusing on high-rate transmissions of payload data from remote sensing satellites, operational systems, like the well-known European Data Relay Satellite system, are based on optical inter-satellite links. Besides, direct-to-earth free-space optical communications from low Earth orbiting spacecraft hold high potential for upcoming space missions through lower complexity. In that regard, we study the viability of the ground-to-space beacon laser signal of optical ground stations to be additionally modulated with tele-command tokens. Such an optical return channel could be variously put into use, e.g. to trigger automatic repeat requests of payload data downlinks, for jamming-free control of the spacecraft or for high-rate software uploads to its on-board processor. A particular challenge is posed by the unequal fading behavior of the optical channel regarding the down- and uplinks, which cover asymmetric optical pathways through the atmosphere. We define the end-to-end architecture of the communication chain including the transmitter on ground and the space-based receiver. Special attention is given to compatibility with established space data and system standards. Moreover, we examine the effects on the scheduling of satellite control, resulting from a constrained availability of the optical uplink due to cloud blockages. Our analysis aims at the employment of available space protocols for bidirectional optical communications with low earth orbiting spacecraft. Further on, we consider the adoption of upcoming standards to account for the optical fading channel. Certain applications like immediate automatic-repeat-requests for the downlink will require novel, optimized protocols.

Item URL in elib:https://elib.dlr.de/123196/
Document Type:Conference or Workshop Item (Speech)
Title:TOWARDS THE UTILIZATION OF OPTICAL GROUND-TO-SPACE LINKS FOR LOW EARTH ORBITING SPACECRAFT
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knopp, Marcus ThomasMarcus.Knopp (at) dlr.deUNSPECIFIED
Spörl, Andreasandreas.spoerl (at) dlr.deUNSPECIFIED
Gnat, MarcinMarcin.Gnat (at) dlr.deUNSPECIFIED
Rossmanith, Gregor JohannesGregor.Rossmanith (at) dlr.deUNSPECIFIED
Huber, FelixF.Huber (at) dlr.deUNSPECIFIED
Fuchs, ChristianChristian.Fuchs (at) dlr.deUNSPECIFIED
Giggenbach, DirkDirk.Giggenbach (at) dlr.deUNSPECIFIED
Date:October 2018
Journal or Publication Title:Proceedings of the International Astronautical Congress, IAC
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
Status:Published
Keywords:KNOCGOP, Free-space optical communication, satellite communications, optical ground-to-space links, direct-to-earth links
Event Title:International Astronautical Congress (IAC)
Event Location:Bremen
Event Type:international Conference
Event Dates:1.-5. Okt 2018
Organizer:IAF
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:Space Operations and Astronaut Training > Controlling and Acquisition
Institute of Communication and Navigation > Satellite Networks
Deposited By: Giggenbach, Dr.-Ing. Dirk
Deposited On:20 Nov 2018 10:50
Last Modified:31 Jul 2019 20:20

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