Estimation of the laser guide star uplink tip-tilt using aperture size diversity
Instrumentation and Methods for Astrophysics
2026-07-14 v1
Abstract
Laser guide star (LGS) adaptive optics cannot directly measure tip-tilt (TT), forcing reliance on natural guide stars and limiting sky coverage. We propose estimating the uplink TT from telemetry acquired at the laser launch telescope alone, operated in a monostatic configuration as both emitter and receiver. Extracting TT over concentric disks of different diameters within the receiving pupil yields signals mixing uplink and downlink contributions in different proportions; this aperture size diversity, combined with an LMMSE estimator, disentangles the uplink component. Simulations show a residual error of 24 mas for a single turbulent layer and 34 mas with two layers.
Keywords
Cite
@article{arxiv.2607.12494,
title = {Estimation of the laser guide star uplink tip-tilt using aperture size diversity},
author = {Pierre Jouve and Thierry Fusco and Carlos M. Correia and Cédric Taissir Heritier and Jean-François Sauvage and Benoit Neichel},
journal= {arXiv preprint arXiv:2607.12494},
year = {2026}
}