PMO OpenIR  > 空间目标与碎片观测研究基地
An adaptive threshold method for improving astrometry of space debris CCD images
Sun, Rong-yu; Zhao, Chang-yin1
2014-06-01
Source PublicationADVANCES IN SPACE RESEARCH
ISSN0273-1177
Volume53Issue:11Pages:1664-1674
AbstractOptical survey is a main technique for observing space debris, and precisely measuring the positions of space debris is of great importance. Due to several factors, e.g. the angle object normal to the observer, the shape as well as the attitude of the object, the variations of observed characteristics for low earth orbital space debris are distinct. When we look at optical CCD images of observed objects, the size and brightness are varying, hence it's difficult to decide the threshold during centroid measurement and precise astrometry. Traditionally the threshold is given empirically and constantly in data reduction, and obviously it's not suitable for data reduction of space debris. Here we offer a solution to provide the threshold. Our method assumes that the PSF (point spread function) is Gaussian and estimates the signal flux by a directly two-dimensional Gaussian fit, then a cubic spline interpolation is performed to divide each initial pixel into several sub-pixels, at last the threshold is determined by the estimation of signal flux and the sub-pixels above threshold are separated to estimate the centroid. A trail observation of the fast spinning satellite Ajisai is made and the CCD frames are obtained to test our algorithm. The calibration precision of various threshold is obtained through the comparison between the observed equatorial position and the reference one, the latter are obtained from the precise ephemeris of the satellite. The results indicate that our method reduces the total errors of measurements, it works effectively in improving the centering precision of space debris images. (C) 2014 COSPAR. Published by Elsevier Ltd. All rights reserved.
KeywordSpace Debris Astrometry Image-processing Optical Observation
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.asr.2014.02.023
WOS KeywordFOLLOW-UP OBSERVATIONS ; PROCESSING TECHNIQUES ; GALILEAN SATELLITES ; ORBIT IMPROVEMENT ; SOURCE EXTRACTION ; OPTICAL SURVEYS ; OBJECTS ; SATURN ; ALGORITHMS ; POSITIONS
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Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics ; Geology ; Meteorology & Atmospheric Sciences
WOS SubjectAstronomy & Astrophysics ; Geosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences
WOS IDWOS:000336771300013
Citation statistics
Cited Times:3[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/10597
Collection空间目标与碎片观测研究基地
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Space Object & Debris Observat, Nanjing 210008, Jiangsu, Peoples R China
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GB/T 7714
Sun, Rong-yu,Zhao, Chang-yin. An adaptive threshold method for improving astrometry of space debris CCD images[J]. ADVANCES IN SPACE RESEARCH,2014,53(11):1664-1674.
APA Sun, Rong-yu,&Zhao, Chang-yin.(2014).An adaptive threshold method for improving astrometry of space debris CCD images.ADVANCES IN SPACE RESEARCH,53(11),1664-1674.
MLA Sun, Rong-yu,et al."An adaptive threshold method for improving astrometry of space debris CCD images".ADVANCES IN SPACE RESEARCH 53.11(2014):1664-1674.
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