自适应光学系统中高精跟踪回路性能在线分析

Performance analysis of tracking loop of high precision for adaptive optical system

在自适应光学系统中,高精跟踪回路的闭环误差由未完全补偿的跟踪残余误差和倾斜噪声误差组成。利用高精跟踪回路闭环残余倾斜数据和电压数据,可以计算高精跟踪回路的跟踪残余误差、倾斜噪声以及开环倾斜误差。基于此种方法对1.2m望远镜61单元自适应光学系统中高精跟踪回路的性能进行了在线分析。分析结果表明,系统引入的噪声随着所观测恒星星等的增加而增加。

In an adaptive optical system, the closed-loop error of the tracking loop of high precision consists of the residual tracking error and the noise error. The residual tilt data and the voltage data of closed-loop are applied to analyze the performance of the tracking loop of high precision of the 61-element adaptive optical system at the 1.2m telescope of Yunnan observatory. The noise error, the residual tracking error and the tilt error of open loop are evaluated. The result illustrates that the noise error increases with the increase of the magnitude of the star.