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Tip tilt and focus estimation based on LGS and downlink joint measurements for ground to GEO satellite optical communication link

Lognoné, Perrine; Rekaya, Ghaya; Montmerle-Bonnefois, Aurélie; Paillier, Laurie; Conan, Jean-Marc

Tip tilt and focus estimation based on LGS and downlink joint measurements for ground to GEO satellite optical communication link Thumbnail


Authors

Ghaya Rekaya

Aurélie Montmerle-Bonnefois

Laurie Paillier

Jean-Marc Conan



Abstract

Achieving high data rates in GEO Feeder optical uplinks faces challenges due to the fading nature of the channel induced by atmospheric turbulence. Adaptive optics pre-compensation using downlink measurements is a solution to mitigate the impact of the turbulence. However, the point-ahead angle anisoplanatism, inherent to the bidirectional link geometry, limits the uplink correction efficiency, leading to persistent signal fades and loss of information onboard the satellite. We recently proposed a new minimum mean square error method that improves the phase estimation at the PAA based on the downlink phase and log amplitude measurements, reducing the anisoplanatism impact on the coupled flux. Alternatively, a laser guide star can be used to measure the phase at the PAA. However, it is currently challenging to retrieve the tip, tilt, and focus modes, whose correction is essential to improve the link quality. In this article, we propose to combine both techniques to estimate the tip, tilt, and focus at the PAA by incorporating the LGS high-order measurements in the MMSE formalism. We develop the associated analytical reconstructor and evaluate the performance of the phase estimation and the gain on the coupled flux statistics aboard the GEO satellite, considering an idealized LGS system. The new estimator is shown to reduce the tip, tilt, and focus error variances by up to 70% of their initial value.

Citation

Lognoné, P., Rekaya, G., Montmerle-Bonnefois, A., Paillier, L., & Conan, J.-M. (2024). Tip tilt and focus estimation based on LGS and downlink joint measurements for ground to GEO satellite optical communication link. Optics Express, 32(21), 37739-37757. https://doi.org/10.1364/oe.538333

Journal Article Type Article
Acceptance Date Sep 26, 2024
Online Publication Date Oct 3, 2024
Publication Date Oct 7, 2024
Deposit Date Oct 10, 2024
Publicly Available Date Oct 10, 2024
Journal Optics Express
Electronic ISSN 1094-4087
Publisher Optica
Peer Reviewed Peer Reviewed
Volume 32
Issue 21
Pages 37739-37757
DOI https://doi.org/10.1364/oe.538333
Public URL https://durham-repository.worktribe.com/output/2953112

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