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• W2003311908 abstract "Optical 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." @default.
• W2003311908 created "2016-06-24" @default.
• W2003311908 creator A5018147628 @default.
• W2003311908 creator A5038158508 @default.
• W2003311908 date "2014-06-01" @default.
• W2003311908 modified "2023-09-25" @default.
• W2003311908 title "An adaptive threshold method for improving astrometry of space debris CCD images" @default.
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• W2003311908 doi "https://doi.org/10.1016/j.asr.2014.02.023" @default.
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