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<div class="csl-entry">Pfennigbauer, M. (2004). <i>Design of optical space-to-ground links for the international space station</i> [Dissertation, Technische Universität Wien]. reposiTUm. https://resolver.obvsg.at/urn:nbn:at:at-ubtuw:1-10348</div>
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Innovative new technologies will have to be developed in near future to satisfy the ever increasing demand on bandwidth coming along with new communication services. Optical free-space laser communication is a promising candidate in this field. While optical space-toground links or optical intersatellite links have been considered since decades, first proof-ofconcept applications of this technology were realized as recently as a few years ago. Establishing an optical link between the International Space Station (ISS) and a ground station could serve as broadband communication link for the scientific experiments aboard the station and could, additionally, extend the operational experience with optical space-to-ground links. Within this thesis, the major concepts and technological requirements for establishing such a communication scenario are presented. The low beam divergence as a consequence of the optical carrier frequency resulting in low link losses is the outstanding advantage of free-space laser communication systems over the widely used radio-frequency technology. Low beam divergence, on the other hand, leads to high technological demands concerning the mutual pointing, acquisition and tracking (PAT) of the communicating terminals. I assess numerical benchmarks for the parameters concerning the link loss, the pointing accuracy and the availability of line-of-sight between the ISS on its low Earth orbit and a ground station. Another issue coming along with a carrier frequency in the optical regime is background radiation from celestial bodies and the atmosphere of the Earth. I calculate the power spectral density accepted by a telescope from the major background sources and assess the impact on the performance of the system. The large distances to be bridged together with the limited transmit power, the high cost of large telescopes and the impossibility of in-line amplification leads to the need for highly sensitive receivers to fully exploit the low signal power available. After comparing different receiver technologies, I focus on optically preamplified direct detection receivers wich combine the advantages of simple setup and the possibility to employ highly developed components employed in fiber-based systems. The design parameters affecting the receiver's performance as well as the influence of the transmitter's properties are investigated by means of simulation employing a detailed model and experiments. Different forms of on-off keying, the standard non return-to-zero (NRZ) format and return-to-zero (RZ) impulsive coding format are employed and the effect on the receiver sensitivity is assessed. By employing RZ coding and optimizing optical and electrical filter bandwidths in the receiver, I experimentally approached the theoretical limit of receiver sensitivity, the quantum limit as close as 1.1 dB. Lately, several applications making use of quantum effects, subsumed under the term quantum communication, have been introduced. I investigate the potential of one of these concepts, quantum key distribution. Employing entangled photons, a cryptography scheme can be established with a privacy provided - in principle - by laws of nature and not to be broken by any measure. There are several aspects equal to classical optical communication, namely PAT, link loss, and background radiation.
en
dc.language
English
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dc.language.iso
en
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dc.rights.uri
http://rightsstatements.org/vocab/InC/1.0/
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dc.subject
Optische Nachrichtenübertragung
de
dc.subject
Breitbandübertragung
de
dc.subject
ISS
de
dc.subject
Bodenstation
de
dc.title
Design of optical space-to-ground links for the international space station
en
dc.type
Thesis
en
dc.type
Hochschulschrift
de
dc.rights.license
In Copyright
en
dc.rights.license
Urheberrechtsschutz
de
dc.contributor.affiliation
TU Wien, Österreich
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dc.rights.holder
Martin Pfennigbauer
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tuw.version
vor
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tuw.thesisinformation
Technische Universität Wien
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tuw.publication.orgunit
E389 - Institut für Nachrichtentechnik und Hochfrequenztechnik
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dc.type.qualificationlevel
Doctoral
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dc.identifier.libraryid
AC04280172
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dc.description.numberOfPages
104
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dc.identifier.urn
urn:nbn:at:at-ubtuw:1-10348
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dc.thesistype
Dissertation
de
dc.thesistype
Dissertation
en
dc.rights.identifier
In Copyright
en
dc.rights.identifier
Urheberrechtsschutz
de
item.openairecristype
http://purl.org/coar/resource_type/c_db06
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item.fulltext
with Fulltext
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item.cerifentitytype
Publications
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item.mimetype
application/pdf
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item.openaccessfulltext
Open Access
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item.grantfulltext
open
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item.openairetype
doctoral thesis
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item.languageiso639-1
en
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crisitem.author.dept
E389 - Institute of Telecommunications
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crisitem.author.parentorg
E350 - Fakultät für Elektrotechnik und Informationstechnik