Hybrid LQG/integrator control for the VLT eXtrem AO system SPHERE
Hybrid LQG/integrator control for the VLT eXtrem AO system SPHERE
复制标题
适用于 VLT eXtrem AO 系统 SPHERE 的混合 LQG/积分器控制
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
H. Raynaud
中科院分区：
文献类型：
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作者：
C. Petit;S. Meimon;T. Fusco;C. Kulcsár;H. Raynaud
SPHERE（光谱偏振高对比度系外行星研究）仪器是欧洲南方天文台的一个项目，旨在直接探测太阳系外行星。它将在2011年装备四台VLT 8米望远镜中的一台。SPHERE仪器的核心是其极端自适应光学（XAO）SAXO（SPHERE AO for eXoplanet Observation）子系统，旨在纠正任何大气和系统缺陷。它应该处理严格的误差预算，特别是关于光轴稳定性。为了满足SAXO的挑战性要求，设计了混合控制律。而一个经典的优化模式增益积分器，确保控制的变形镜，线性二次高斯控制已被设计来管理的倾斜倾斜镜。因此，它提供了对湍流引起的光轴波动的校正，而且还提供了对振动的过滤。提出了一种在线辨识湍流和振动分量先验模型的方法。我们描述了这种原始的控制结构，并提出了预期的SAXO性能。
The SPHERE (Spectro-Polarimetry High-contrast Exoplanet Research) instrument is an ESO project aiming at the direct detection of extra-solar planets. It will equip one of the four VLT 8-m telescopes in 2011. The heart of the SPHERE instrument is its eXtrem Adaptive Optics (XAO) SAXO (SPHERE AO for eXoplanet Observation) subsystem which aims at correcting any atmospheric and system defect. It should deal with a tight error budget, particularly concerning the optical axis stability. To fulfill SAXO challenging requirements a mixed control law has been designed. While a classic optimized modal gain integrator ensures the control of the deformable mirror, a linear quadratic Gaussian control has been designed to manage the tip-tilt mirror. It thus provides correction of turbulence induced optical axis fluctuations but also filtering of vibrations. A specific scheme has been developed to identify on-line the prior models for the turbulent and vibration components. We describe this original control architecture and present expectable performance of SAXO.