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DIRECT OPTICAL HIGH SPEED DOWNLINKS AND GROUND STATION NETWORKS FOR SMALL LEO MISSIONS

Giggenbach, Dirk und Moll, Florian und Fuchs, Christian und Brechtelsbauer, Martin (2010) DIRECT OPTICAL HIGH SPEED DOWNLINKS AND GROUND STATION NETWORKS FOR SMALL LEO MISSIONS. In: Proceedings of the 16th Ka- and Broadband Communications Conference. 16th Ka- and Broadband Communications Conference, Milan 2010, 20.-22. Okt. 2010, Mailand.

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Kurzfassung

Direct microwave data downlink capacity of today’s earth observation satellites is limited in terms of available spectrum, transmission data rate, and power consumption. One elegant solution is the use of geostationary data relays satellites which connect to the low flying observation satellite by optical or Ka-band links and do the downlink to the ground station by another Ka-band link. This scenario also allows near real-time data access to the EO-sensors for at least half of the LEO’s orbit. However it also implies efforts in terms of the number of long-range communication terminals employed by one EO-mission. Compact LEOs often cannot afford such a connection due to financial- but also mass- and power-constraints. To enable also these kinds of missions with high rate downlink capacity, small optical terminals can be used that boost the data rate by orders of magnitude compared to today’s RF downlinks. The feasibility of direct optical downlinks from LEO satellites has been demonstrated recently with the laser terminals onboard JAXA’s OICETS and onboard the German TerraSAR-X. As such direct optical downlinks are hindered by cloud cover, a ground station network is required to ensure a certain required average downlink capacity, independent from the cloud situation. For one thing each optical ground station should be situated in a region with low cloud cover in general. But also the different ground stations of one network should be spaced far apart as to avoid correlation of their cloud cover statistics. Furthermore in a global ground station network, sites north and south of the equator are seasonal de-correlated. DLR’s Optical Communications Group is investigating the feasibility of direct optical LEO downlinks theoretically and practically together with partners [1], [2], [3]. The performance of optical downlinks has been evaluated by long-term global cloud statistics with different sets of ground station combinations. Furthermore, downlink campaigns shall be performed in near future with simple optical downlink sources on small LEO missions, verifying the theoretical findings. A Transportable Optical Ground Station (TOGS) will be used to carry out these trial campaigns.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:DIRECT OPTICAL HIGH SPEED DOWNLINKS AND GROUND STATION NETWORKS FOR SMALL LEO MISSIONS
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Giggenbach, DirkDirk.Giggenbach@dlr.de
Moll, Florianflorian.moll@dlr.de
Fuchs, ChristianChristian.Fuchs@dlr.de
Brechtelsbauer, MartinMartin.Brechtelsbauer@dlr.de
Datum:Oktober 2010
Erschienen in:Proceedings of the 16th Ka- and Broadband Communications Conference
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Optical Satellite Downlink, KNOCGOP
Veranstaltungstitel:16th Ka- and Broadband Communications Conference, Milan 2010
Veranstaltungsort:Mailand
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:20.-22. Okt. 2010
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W KN - Kommunikation/Navigation
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W KN - Kommunikation/Navigation
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Multimedia Satellitennetze (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Kommunikation und Navigation > Digitale Netze
Hinterlegt von: Dr.-Ing. Dirk Giggenbach
Hinterlegt am:18 Nov 2010 08:19
Letzte Änderung:18 Nov 2010 08:19

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