Gibson J S, Chang C C, Ellerbroek B L
Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, California 90095-1597, USA.
Appl Opt. 2000 Jun 1;39(16):2525-38. doi: 10.1364/ao.39.002525.
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.
描述了一类自适应光学问题，其中由大气湍流引起的相位畸变通过使用可变形镜进行自适应波前重建来校正，即驱动镜子的控制环路实时适应随时间变化的大气条件，这与传统自适应光学中使用的线性时不变控制环路相反。基本问题被表述为具有多个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格型滤波器构建的自适应前馈控制环路。给出了针对具有单层和两层大气湍流剖面的1米望远镜的仿真结果。这些结果表明，与经典的线性时不变控制环路相比，自适应控制环路在成像分辨率方面有显著提高。
