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Wavelength Selection Criteria and Link Availability due to Cloud Coverage Statistics and Attenuation affecting Satellite, Aerial, and Downlink Scenarios

Moll, Florian and Knapek, Markus (2007) Wavelength Selection Criteria and Link Availability due to Cloud Coverage Statistics and Attenuation affecting Satellite, Aerial, and Downlink Scenarios. In: Proceedings of SPIE -- Volume 6709, pp. 670616-1. SPIE Optical Press. Free-Space Laser Communications VII, 2007-08-26 - 2007-08-30, San Diego, California, USA.

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Official URL: http://spie.org/x648.xml?product_id=734269

Abstract

The choice of wavelength is essential for the variety of different communication scenarios in the field of free space optics (FSO). Possibilities are Satellite and HAP (High Altitude Platform) Downlinks, HAP-HAP links, HAP-Satellite links and all kinds of links involving aeronautical vehicles. This paper addresses the influence of the wavelength dependent attenuation of clouds, the atmospheric transmission in the NIR and MIR and a statistical analysis of cloud coverage data for an estimation of link availability. Regarding the calculation of atmospheric transmission the free available simulation tools libRadtran and GENLN2 have been used. To identify advantageous wavelengths to increase link availability, cloud attenuation is determined by Mie scattering calculations of particle size distributions of various cloud types. Here the MIR wavelength interval between 10 µm and 12 µm has been found to give the lowest attenuation in clouds. However in most cases clouds will block the optical link. For that matter a statistical analysis of satellite based data from the European Cloud Climatology (ECC) is done to reveal favorable places with high availability in Europe. The improvement of link availability when a concept of ground station diversity is applied has also been investigated. An availability of almost 99 % is reached with four hypothetical stations in southern Europe. Further the difference between availability values of single years decreases with multiple stations.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Wavelength Selection Criteria and Link Availability due to Cloud Coverage Statistics and Attenuation affecting Satellite, Aerial, and Downlink Scenarios
Authors:
AuthorsInstitution or Email of Authors
Moll, FlorianUNSPECIFIED
Knapek, MarkusUNSPECIFIED
Date:September 2007
Journal or Publication Title:Proceedings of SPIE -- Volume 6709
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 670616-1
Editors:
EditorsEmail
SPIE-The International Society for Optical Engineering, UNSPECIFIED
Publisher:SPIE Optical Press
Status:Published
Keywords:Atmospheric attenuation, cloud attenuation, ECC, free space optics, GENLN2, link availability, MIR, statistical cloud coverage, libRadtran, 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
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 20:27

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