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Effects of Pointing Errors on Intensity Losses in the Optical LEO Uplink

Carrillo Flores, Andrea Montserrat and Giggenbach, Dirk and Knopp, Marcus Thomas and Orsucci, Davide and Shrestha, Amita (2022) Effects of Pointing Errors on Intensity Losses in the Optical LEO Uplink. In: 2022 International Conference on Space Optics, ICSO 2022. International Conference on Space Optics (ICSO), 2022-10-03 - 2022-10-07, Dubrovnik, Croatia. doi: 10.1117/12.2691100. ISBN 978-151066803-4. ISSN 0277-786X.

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Official URL: https://www.spiedigitallibrary.org/conference-proceedings-of-spie/12777/2691100/Effects-of-pointing-errors-on-intensity-losses-in-the-optical/10.1117/12.2691100.full?tab=ArticleLink

Abstract

Different pointing errors from different sources cause an angular deviation in the uplink beam transmitted from an optical ground station (OGS) to a satellite. In optical link-budget calculations, the beam intensity loss due to pointing errors, “pointing loss”, is usually given a constant value regardless of the satellite elevation. In this paper, elevation-dependent intensity losses are calculated, considering a transmitted uplink beam with a Gaussian profile. The elevation of the satellite and the divergence of the uplink beam are considered to assess the impact of the following sources of tracking and pointing errors: OGS static pointing misalignment, uncorrected or fixed-corrected point-ahead angle (PAA), satellite orbital data uncertainties (specifically the along-track error), and mechanical jitter at the OGS. Each source of error is first evaluated separately and then the combination of their effects on the intensity loss in the LEO uplink is determined. It is demonstrated that the elevation-dependent pointing errors analyzed in this work have a greater impact on the intensity loss for satellites at lower altitudes and higher elevations. Therefore, not considering that the value of the “pointing loss” varies with elevation -especially for LEO satellites-, would result in lower link performance. Values of intensity loss are provided for LEO satellites at different altitudes and elevations, and uplink beam divergences. The results provided can be used for link-budget calculations in the optical LEO uplink in the presence of elevation-dependent pointing errors, and for system improvements in the design of future ground and space optical terminals.

Item URL in elib:https://elib.dlr.de/191052/
Document Type:Conference or Workshop Item (Poster)
Title:Effects of Pointing Errors on Intensity Losses in the Optical LEO Uplink
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Carrillo Flores, Andrea MontserratUNSPECIFIEDhttps://orcid.org/0000-0002-0073-5889UNSPECIFIED
Giggenbach, DirkDLR-IKNhttps://orcid.org/0000-0003-1720-3464UNSPECIFIED
Knopp, Marcus ThomasRSChttps://orcid.org/0000-0002-6819-6279152055312
Orsucci, DavideDLR-IKNUNSPECIFIEDUNSPECIFIED
Shrestha, AmitaDLR-IKNUNSPECIFIEDUNSPECIFIED
Date:2022
Journal or Publication Title:2022 International Conference on Space Optics, ICSO 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:No
DOI:10.1117/12.2691100
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
Cugny, BrunoCNES, FranceUNSPECIFIEDUNSPECIFIED
Karafolas, NikosESA/ESTEC, The NetherlandsUNSPECIFIEDUNSPECIFIED
Minoglou, KyriakiESA/ESTEC, The NetherlandsUNSPECIFIEDUNSPECIFIED
ISSN:0277-786X
ISBN:978-151066803-4
Status:Published
Keywords:Free-space optical communications (FSOC), pointing loss, link budget, elevation-dependent, point-ahead angle, orbit uncertainties, mechanical jitter, divergence angle, KNOCGOP
Event Title:International Conference on Space Optics (ICSO)
Event Location:Dubrovnik, Croatia
Event Type:international Conference
Event Start Date:3 October 2022
Event End Date:7 October 2022
Organizer:ESA
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Communication, Navigation, Quantum Technology
DLR - Research area:Raumfahrt
DLR - Program:R KNQ - Communication, Navigation, Quantum Technology
DLR - Research theme (Project):R - OSIRIS Future
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Communication and Navigation > Optical Satellite Links
Responsive Space Cluster Competence Center > Ground Segment
Deposited By: Carrillo Flores, Andrea Montserrat
Deposited On:08 Dec 2022 12:24
Last Modified:24 Apr 2024 20:52

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