Hybrid Control Method for Adaptive Optics System
Hybrid Control Method for Adaptive Optics System
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DOI：
10.3788/lop57.230101
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发表时间：
2020-12-01
影响因子：
1
通讯作者：
Rao Changhui
中科院分区：
文献类型：
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作者：
Wang Jiaying;Guo Youming;Rao Changhui
当对各模态采用线性二次高斯(LQG)控制时，高阶扰动模型不仅需要不可忽略的辨识工作，而且需要计算高阶控制矩阵，大大增加了实时处理器的计算负担。为了解决这个问题，我们提出了一种自适应光学（AO）系统的混合控制方法，从实现的角度来看是可行的。该方法结合了最优模态增益积分控制（OMGI）和LQG控制算法，根据模态是否受到窄带扰动的影响，设计相应模态的控制策略。使用抚仙太阳观测站（FSO）1米新型真空太阳望远镜（NVST）记录的空中测量数据评估所提出的控制方法的性能。结果表明，混合控制方法可以有效滤除95.85%的干扰。与全OMGI相比，不同频率的窄带干扰得到了显着抑制。与全LQG相比，辨识程序的执行时间减少了37.77 A，控制计算时间减少了73.8%，更有利于扰动的实时缓解。
When using linear quadratic Gaussian (LQG) control on each mode, the higher-order disturbance model not only requires non-negligible identification effort but also leads to the calculations of high-order control matrix, which greatly increases the computational burden of the real-time processor. To address this problem, we propose a hybrid control method for adaptive optics (AO) system, which is feasible from an implementation viewpoint. This method combines the optimal modal gain integral control (OMGI) and LQG control algorithm, and designs the control strategy of the corresponding mode according to whether the mode is affected by narrow-band disturbances. The performances of the proposed control method are evaluated using the on-sky measurement data recorded by the 1-m New Vacuum Solar Telescope (NVST) at Fuxian Solar Observatory (FSO). The results show that 95.85% of disturbances are effectively filtered by the hybrid control method. Compared with the full-OMGI, the narrow-band disturbances at different frequencies are significantly suppressed. And compared with the full-LQG, the execution time of identification procedure is reduced by 37.77 A and the control calculation time is reduced by 73.8%, which is more beneficial for the real-time mitigation of disturbance.