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Adaptive optics: wave-front correction by use of adaptive filtering and control

机译：自适应光学：通过自适应滤波和控制进行波前校正

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摘要

A class of adaptive-optics problems is described in which phase distortions caused by atmospheric turbulence are corrected by adaptive wave-front reconstruction with a deformable mirror, i.e., the control loop that drives the mirror adapts in real time to time-varying atmospheric conditions, as opposed to the linear time-invariant control loops used in conventional adaptive optics. The basic problem is posed as an adaptive disturbance-rejection problem with many channels. The solution given is an adaptive feedforward control loop built around a multichannel adaptive lattice filter. Simulation results are presented for a 1-m telescope with both one-layer and two-layer atmospheric turbulence profiles. These results demonstrate the significant improvement in imaging resolution produced by the adaptive control loop compared with a classical linear time-invariant control loop.
机译：描述了一类自适应光学问题，其中由大气湍流引起的相位失真通过使用可变形反射镜的自适应波前重构进行校正，即驱动反射镜的控制环实时适应时变的大气条件，与常规自适应光学系统中使用的线性时不变控制环相反。基本问题被提出为具有许多通道的自适应干扰抑制问题。给出的解决方案是围绕多通道自适应晶格滤波器构建的自适应前馈控制环路。给出了具有一层和两层大气湍流剖面的1-m望远镜的仿真结果。这些结果表明，与经典的线性时不变控制回路相比，自适应控制回路可显着提高成像分辨率。

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