Estimation of the lateral mis-registrations of the GRAVITY+ adaptive optics system - Perturbative method with open-loop modal correlation and non-perturbative method with temporal correlation of closed-loop telemetry

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Table 4

System auto-alignment with the closed loop estimator.

	δ_x/δ_y (%Δ)	θ (°)	$δ_{ρ_{x}} / δ_{ρ_{y}}$ $\[\delta_{\rho_x} / \delta_{\rho_y}\]$ (%)
t = 0s	11.3/44.7	35.1	0.2/1.2
t = 300 s	−1.4/−2.25	35.1	0.3/1.1
t = 450 s	−1.9/−1.6	35.1	0.2/1.0

Notes. PSIM parameters fitted by SPARTA on the IM measured before the system auto-alignment with the closed loop estimator (t = 0 s), after the convergence while the phase plate was spinning (t = 300 s) and without the phase plate (t = 400 s). θ: clocking. $δ_{ρ_{x}} / δ_{ρ_{y}}$ $\[\delta_{\rho_x} / \delta_{\rho_y}\]$ : stretches along the x and y-axes.

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