摘要
对地平式望远镜机架模型拟合的指向误差数据进行分析,介绍了指向误差数据的获取方法。采用最小二乘法求解修正系数,结合方位轴和高度轴的位置拟合指向修正量。在显著性水平α=0.05下进行残差分析,剔除偏离过大的点以提高拟合精度。通过计算均方根误差、相关系数、F检验的P值验证了机架模型的有效性。结果说明增加测试数据后,未经残差检验不一定能提高拟合精度,以及分次获取的误差数据可合并处理。将求解的系数写入配置文件,在指向与跟踪过程中根据光栅编码器的反馈值实时修正。
The pointing error data of the frame model which apply to the altazimuth telescope are analyzed.The method of obtaining pointing error data is introduced in this paper.The least square method is used to solve the correction coefficient,and the pointing correction amount is fitted by combining the position of the azimuth axis and the height axis.At the significance level ofα=0.05,the residual analysis is carried out to eliminate those points with excessive deviation to improve the fitting accuracy.The validity of the model is verified by calculating RMS error,correlation coefficient and P value of F test.This article explains that the fitting accuracy can not be improved without residual test after adding test data,and the error data obtained in different times can be combined for processing.Coefficients are written into the configuration file,and then the pointing error is corrected in real time according to the feedback value of the grating encoder during the pointing and tracking process.
作者
胡晓炜
朱庆生
Hu Xiaowei;Zhu Qingsheng(University of Science and Technology of China,Hefei 230026,China;Nanjing Astronomical Instruments Limited Company,Chinese Academy of Sciences,Nanjing 210042,China)
出处
《天文研究与技术》
CSCD
2021年第1期77-86,共10页
Astronomical Research & Technology
关键词
残差分析
机架模型
指向修正
指向误差数据获取
Residual analysis
Frame model
Pointing correction
Acquisition of pointing error data
