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对自适应光学系统的动态控制过程进行了数值模拟。与自动控制理论的解析分析相比 ,动态控制过程的数值模拟有其优越性。系统的频率响应特性与动态控制性能密切相关 ,对自适应光学系统的频率响应特性也进行了数值模拟。模拟计算的结果与实验测量结果符合得很好。还实现了多频率成份的同时计算 ,可以大大提高计算效率。其结果与单频率结果只在低频下有小的差别 ,可以满足得到带宽和裕量等参数的实用要求。将频率响应特性的模拟计算与长时间曝光斯特列耳 (Strehl)比的数值模拟结合 ,可得到对自适应光学系统性能的有效评估。
The dynamic control process of adaptive optics system is numerically simulated. Compared with the analysis of automatic control theory, numerical simulation of dynamic control process has its advantages. The frequency response of the system is closely related to the dynamic control performance. The frequency response characteristics of the adaptive optics system are also numerically simulated. The results of the simulation are in good agreement with the experimental measurements. Also realized the simultaneous calculation of multi-frequency components, can greatly improve the computational efficiency. The result is a little different from the single-frequency result only at low frequencies, which meets the practical requirements of obtaining bandwidth and margin parameters. Combining the simulation of the frequency response with the numerical simulation of the Strehl ratio of the long-term exposure provides an effective assessment of the performance of the adaptive optics system.