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Optical High-Capacity Satellite Downlinks via High-Altitude Platform Relays

Knapek, Markus and Horwath, Joachim and Moll, Florian and Epple, Bernhard and Courville, Nicolas and Bischl, Hermann and Giggenbach, Dirk (2007) Optical High-Capacity Satellite Downlinks via High-Altitude Platform Relays. In: Proceedings of SPIE, 6709, 67090E-1-67090E-12. SPIE Optical Press. Free-Space Laser Communications VII, 2007-08-26 - 2007-08-30, San Diego, California (USA). ISBN 9780819468574.

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Earth-observation (EO) satellite missions produce a large amount of data using high-resolution optical or radar sensors. During the last decades the amount of data has steadily increased due to improved sensor technologies with increased temporal resolution, sensor resolution, and pixel count. As a consequence EO satellite missions have become limited by the downlink data rates of microwave communication systems, which are inhibited by spectrum restrictions, manageable antenna sizes, and available transmit power. Optical downlinks from EO satellites with data rates of several Gbps mitigate the limiting effects of microwave communication systems; however optical links do not provide the necessary link availability through the atmosphere due to cloud blockage above the ground station. Apart from diversity concepts with several ground stations or satellite networks, a stratospheric High Altitude Platform (HAP) could act as a relay station to forward the optical communication beam over the last 20km through the atmosphere to the ground station, where short-range, high data-rate microwave systems are feasible. This paper will discuss the capabilities of HAP and GEO relay stations to increase the downlink capacities of LEO satellites. Environmental aspects for the deployment of HAP relays and regulatory/technology issues for a microwave downlink on the last 20km to the ground will be discussed.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Optical High-Capacity Satellite Downlinks via High-Altitude Platform Relays
AuthorsInstitution or Email of Authors
Horwath, JoachimUNSPECIFIED
Epple, BernhardUNSPECIFIED
Courville, NicolasUNSPECIFIED
Bischl, HermannUNSPECIFIED
Giggenbach, DirkUNSPECIFIED
Date:September 2007
Journal or Publication Title:Proceedings of SPIE
Refereed publication:Yes
In ISI Web of Science:No
Page Range:67090E-1-67090E-12
SPIE-The International Society for Optical Engineering, UNSPECIFIED
Publisher:SPIE Optical Press
Keywords:High-Altitude Platform Relays, Optical Free-Space Communication, Satellite Downlinks, KNOCGOP
Event Title:Free-Space Laser Communications VII
Event Location:San Diego, California (USA)
Event Type:international Conference
Event Dates:2007-08-26 - 2007-08-30
Organizer:SPIE - The International Society for Optical Engineering
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W KN - Kommunikation/Navigation
DLR - Research area:Space
DLR - Program:W KN - Kommunikation/Navigation
DLR - Research theme (Project):W - Vorhaben Multimedia Satellitennetze (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Digital Networks
Deposited By: Florian Moll
Deposited On:29 Feb 2008
Last Modified:12 Dec 2013 20:30

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