论文部分内容阅读
为了完成TMT三镜轴系的检测与装调,引入了极大似然估计来完成TMT三镜轴系装调。首先提出利用两过定点的相交拟合平面辨识一条空间直线;之后考虑到测量数据噪声类型的不确定性,提出使用极大似然估计对三镜机械轴位置参数进行辨识,并在MATLAB产生的一组带有高斯白噪声的训练集上对两个拟合平面所过定点位置进行优化,拟合轴线与理想轴线的夹角由优化前的6.29″降低为优化后的5.24″,优化量为17%;然后选定Vantage激光跟踪仪作为TMT大型轴系的检验工具,利用之前的优化方案,得出在该方法下TMT三镜轴系的定位残差为2.9″,小于TMT招标方提出的指标4″。文中将极大似然线性拟合用于TMT三镜轴系装调,提出了一种实时性强、适用范围广的方法,对于其他大口径光学系统轴系的检测与调节也有很大的借鉴意义。
In order to complete the detection and setup of the TMT three-mirror system, a maximum likelihood estimation was introduced to complete the TMT three-mirror system setup. First of all, we propose to identify a space line by using the intersecting fitting plane of two over-fixed points. Then, taking into account the uncertainty of the noise type of measurement data, we propose to use the maximum likelihood estimation to identify the position parameters of the three- A set of training sets with Gaussian white noise is used to optimize the position of the fixed point over the two fitting planes. The included angle between the fitted axis and the ideal axis is reduced from 6.29 “before optimization to 5.24 after optimization, and the optimization amount is 17%. Then, the Vantage laser tracker was selected as the inspection tool for the TMT large shaft system. Using the previous optimization scheme, the positioning residual of the TMT three-axis system was 2.9 ”less than that proposed by the TMT bidder Indicator 4 ". In this paper, the maximum likelihood linear fitting is applied to the TMT three-mirror system, and a method with strong real-time and wide range of application is proposed. It is also of great reference to the detection and adjustment of other large-diameter optical systems. significance.