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Reducing Data Latency with Inter-Satellite Links in LEO Constellations: Trade-off Analysis and Impact on Concept of Operations

Kling, Ulrich Rolf und Pavicic, Sabrina und Hiebl, David und Ziegler, Spencer Wilson (2023) Reducing Data Latency with Inter-Satellite Links in LEO Constellations: Trade-off Analysis and Impact on Concept of Operations. 17th International Conference on Space Operations, 2023-03-06 - 2023-03-10, Dubai, United Arab Emirates.

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Offizielle URL: https://star.spaceops.org/user_manudownload.php?doc=490__3q8c6mm4.pdf

Kurzfassung

Information on its own has a value but equally the point in time when that information is received is also an important consideration. Data latency, the time needed to perform the measurement with the satellite’s payload and deliver the actionable information to the customer, is a key design decision for ensuring the customer’s needs are met whilst ensuring the mission’s costs are viable. The conventional approach in satellite missions has been to wait until the next booked ground station is overflown, transmitting the data to the ground station and subsequently transferring the data to the data processing center where the derived products are generated. Each of these steps take time and, in their sum, contribute to the total duration of the data latency. When designing or assessing concepts for monitoring activities globally on the Earth with LEO satellite constellations, the constellation itself offers new ways of reducing the data latency. In addition to the existing data transmission service from LEO via GEO to the ground, the data latency can also be reduced either by employing inter-satellite links or edge computing. In this paper we compare the approaches of using i) a ground station network, ii) optical inter-satellite links and iii) edge computing to affect the data latency and compare their use on the annual operational expenditure for the mission. Our analysis shows that incorporating inter-satellite links reduces the data latency by a factor of 2 when compared to constellations solely relying on a ground station network. Whilst onboard processing offers advantages, such as reducing the amount of data that has to be downlinked, it does not reduce the data latency. The interference of the optical link’s performance due to sunlight is not considered to have an operational constraint or significant impact on the data latency. Inter-satellite links importantly allow the locations of ground stations to be placed where desired. To achieve an equivalent data latency without inter-satellite links and solely a ground station network requires a factor of 5 more OPEX, i.e. that saving can be used to finance the CAPEX of the inter-satellite links or compute the break-even point. Alternatively, a constellation using solely a ground station network achieves a 90th percentile data latency that is slower by a factor of nearly 6 using an equivalent OPEX that constellations with inter-satellite links require.

elib-URL des Eintrags:https://elib.dlr.de/203299/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Reducing Data Latency with Inter-Satellite Links in LEO Constellations: Trade-off Analysis and Impact on Concept of Operations
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Kling, Ulrich RolfUlrich.Kling (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Pavicic, SabrinaSabrina.Pavicic (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Hiebl, Daviddavid.hiebl (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Ziegler, Spencer WilsonSpencer.Ziegler (at) dlr.dehttps://orcid.org/0009-0005-1420-3989157267484
Datum:7 März 2023
Referierte Publikation:Nein
Open Access:Ja
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Satellite Constellations, Data Latency, Inter-satellite Links, Satellite Operations, CONOPS
Veranstaltungstitel:17th International Conference on Space Operations
Veranstaltungsort:Dubai, United Arab Emirates
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:6 März 2023
Veranstaltungsende:10 März 2023
Veranstalter :SpaceOps
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Kommunikation, Navigation, Quantentechnologien
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R KNQ - Kommunikation, Navigation, Quantentechnologie
DLR - Teilgebiet (Projekt, Vorhaben):R - Digitaler Zwilling für Konstellationen
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Galileo Kompetenzzentrum
Hinterlegt von: Ziegler, Spencer Wilson
Hinterlegt am:09 Apr 2024 11:29
Letzte Änderung:24 Apr 2024 21:03

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