在CANARY探路者上首次进行全线性二次高斯（LQG）控制并带有振动抑制的天基自适应光学系统（SCAO）验证。

First on-sky SCAO validation of full LQG control with vibration mitigation on the CANARY pathfinder.

作者信息

Sivo Gaetano, Kulcsár Caroline, Conan Jean-Marc, Raynaud Henri-François, Gendron Eric, Basden Alastair, Vidal Fabrice, Morris Tim, Meimon Serge, Petit Cyril, Gratadour Damien, Martin Olivier, Hubert Zoltan, Sevin Arnaud, Perret Denis, Chemla Fanny, Rousset Gérard, Dipper Nigel, Talbot Gordon, Younger Eddy, Myers Richard, Henry David, Todd Stephen, Atkinson David, Dickson Colin, Longmore Andy

出版信息

Opt Express. 2014 Sep 22;22(19):23565-91. doi: 10.1364/OE.22.023565.

DOI:10.1364/OE.22.023565

PMID:25321824

Abstract

Adaptive optics provides real time correction of wavefront disturbances on ground based telescopes. Optimizing control and performance is a key issue for ever more demanding instruments on ever larger telescopes affected not only by atmospheric turbulence, but also by vibrations, windshake and tracking errors. Linear Quadratic Gaussian control achieves optimal correction when provided with a temporal model of the disturbance. We present in this paper the first on-sky results of a Kalman filter based LQG control with vibration mitigation on the CANARY instrument at the Nasmyth platform of the 4.2-m William Herschel Telescope. The results demonstrate a clear improvement of performance for full LQG compared with standard integrator control, and assess the additional improvement brought by vibration filtering with a tip-tilt model identified from on-sky data, thus validating the strategy retained on the instrument SPHERE at the VLT.

摘要

自适应光学技术可对地基望远镜上的波前扰动进行实时校正。对于越来越大型且要求日益严苛的仪器而言，优化控制和性能是一个关键问题，这些仪器不仅受到大气湍流的影响，还受到振动、风抖和跟踪误差的影响。当具备扰动的时间模型时，线性二次高斯控制可实现最优校正。在本文中，我们展示了在4.2米威廉·赫歇尔望远镜纳秒平台上的CANARY仪器上基于卡尔曼滤波器的LQG控制并带有振动抑制功能的首次实测结果。结果表明，与标准积分器控制相比，全LQG控制的性能有明显提升，并且评估了利用从实测数据中识别出的倾斜-倾斜模型进行振动滤波所带来的额外提升，从而验证了在甚大望远镜上的SPHERE仪器所采用的策略。