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基于系列斑点图像的视宁度估算精度方法研究
Alternative TitleSeeing estimation accuracy study based on a sequence of speckle images
胡钢1,2; 向永源1; 刘忠1; 王新华1,2
Source Publication天文研究与技术(Astronomical Research & Technology)
2020
DOI10.14005/j.cnki.issn1672-7673.20200904.002
ClassificationP11
Contribution Rank第1完成单位
Indexed ByCSCD
Keyword视宁度 半高宽 像运动法 跟踪误差
Abstract

半高宽法和像运动法是估算大气视宁度的常用方法。这两种方法的估算精度都会受到望远镜跟踪误差,风或机械振动等因素的影响。提高视宁度估算精度在高分辨成像、选址、台站视宁度监测等领域有重要意义。对于半高宽法,用二维高斯函数拟合长曝光点源单星星像并选取合适方向的半高宽估算视宁度,与谱比法对照发现可以有效改善跟踪误差,风或机械振动等因素的影响。对于像运动法,用主成分分析方法找到一系列斑点图重心位置在合适方向上投影的方差,以此估算视宁度,与谱比法对照发现可以有效改善跟踪误差,风或机械振动等因素的影响。

Other Abstract

FWHM and image motion are two frequently used methods in the field of astronomy. However, estimation accuracy of these two methods will be affected by tracking error, wind and mechanical vibration. Raising its accuracy plays a rather important role in the area of high-resolution imaging, site selection and seeing monitoring of observatories, etc. For FWHM method, we fit the long exposure im age with a two-dimensional gaussian function and choose an appropriate direction to measure its FWHM by which we estimate the seeing parameter. A comparison with spectral ratio method shows a great improvement of our approach against tracking error, wind and mechanical vibration. For image motion method, we employ principle component analysis to project center of gravity coordinates of a sequence of tracking error affected speckle images onto a proper direction on which we find its variance. We further utilize the variance to estimate the seeing parameter. A comparison with spectral ratio method also denotes a considerable improvement of our approach against tracking error, wind and mechanical vibration.

Funding Project国家自然科学基金[U1831210]
Funding Organization国家自然科学基金[U1831210]
Language中文
Subject Area天文学 ; 天文学其他学科
MOST Discipline Catalogue理学 ; 理学::天文学
ISSN1672-7673
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/23639
Collection抚仙湖太阳观测站
Corresponding Author向永源
Affiliation1.中国科学院云南天文台, 云南, 昆明, 650011
2.中国科学院大学, 北京, 100049
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Corresponding Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
胡钢,向永源,刘忠,等. 基于系列斑点图像的视宁度估算精度方法研究[J]. 天文研究与技术(Astronomical Research & Technology),2020.
APA 胡钢,向永源,刘忠,&王新华.(2020).基于系列斑点图像的视宁度估算精度方法研究.天文研究与技术(Astronomical Research & Technology).
MLA 胡钢,et al."基于系列斑点图像的视宁度估算精度方法研究".天文研究与技术(Astronomical Research & Technology) (2020).
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