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Atmospheric Refraction and its Impact on Free-space Optic Communication Systems

Hedman, Karin and David, Florian (2004) Atmospheric Refraction and its Impact on Free-space Optic Communication Systems. In: Proceedings of SPIE 2004, Vol. 5572, pp. 199-210. Remote Sensing Europe, Maspalomas, Spain, 13-17 September 2004, Maspalomas, Spain.

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Abstract

Atmospheric refraction bends optical beams and lets objects appear in positions they not really are. This phenomenon is very important in astronomy. However, astronomical refraction formulas can only be used if the light source is at a very far distance from the observer. Then, atmospheric refraction mainly depends on meteorological conditions on ground. In case of optical free-space communications, the distances are comparatively short and well-known formulas for astronomical refraction are no longer sufficient. An exact knowledge of the structure of the whole atmosphere is required to assess refraction in this case. Due to the complexity of the atmosphere, analytical solutions are not possible. Hence, a numerical simulation model based on spherical symmetry, atmospheric shell modeling and standard atmosphere models was used instead. Three different categories of refraction were examined: 1) the observer is situated on ground and the object is at an altitude of at least 25 km, 2) both object and observer are below 25 km and the link path is mainly vertical and 3) both object and observer are in the stratosphere and ray paths are mainly horizontal. The results presented in this work are useful for applications like laser beam pointing and satellite tracking, UAV (Unmanned Aerial Vehicle) and HAP (High Altitude Platform) downlinks or long-haul cross-links through the atmosphere, e.g. HAP-HAP or UAV-satellite.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=2004,
Title:Atmospheric Refraction and its Impact on Free-space Optic Communication Systems
Authors:
AuthorsInstitution or Email of Authors
Hedman, KarinUNSPECIFIED
David, FlorianUNSPECIFIED
Date:2004
Journal or Publication Title:Proceedings of SPIE 2004
Refereed publication:Yes
In ISI Web of Science:No
Volume:Vol. 5572
Page Range:pp. 199-210
Status:Published
Keywords:Free-space, Optic, Atmosphere, KNOCGOP
Event Title:Remote Sensing Europe, Maspalomas, Spain, 13-17 September 2004
Event Location:Maspalomas, Spain
Event Type:international Conference
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: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 21:34

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