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A fast onboard star-extraction algorithm optimized for the SVOM Visible Telescope
Wang TianZhou1,2; Qiu YuLei1; Cai HongBo1; Deng JingSong1
2010
发表期刊SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
卷号53页码:51-55
摘要The Space multi-band Variable Object Monitor (SVOM) is a proposed Chinese astronomical satellite, dedicated to the detection, localization and measurement of gamma-ray bursts (GRBs) on a cosmological scale. An efficient algorithm is developed for the purpose of onboard star extraction from the CCD images obtained with the Visible Telescope (VT) onboard the SVOM. The CCD pixel coordinates of the reference stars will be used to refine the astronomical position of the satellite, which will facilitate triggering rapid ground-based follow-up observations of the GRBs. In this algorithm, the image is divided into a number of grid cells and the "global" pixel-value maximum within each cell is taken as the first-guess position of a "bright" star. The correct center position of a star is then computed using a simple iterative method. Applying two additional strategies, i.e., scanning the image only by even (or odd) lines or in a black-white chess board mode, we propose to further reduce the time to extract the stars. To examine the efficiency of the above algorithms, we applied them to the experimental images obtained with a ground-based telescope. We find that the accuracy of the astronomical positioning achieved by our method is comparable to that derived by using the conventional star-extraction method, while the former needs about 25 times less CPU time than the latter. This will significantly improve the performance of the SVOM VT mission.
关键词Gamma-ray Burst (Grbs) Svom Vt On Board computatiOn
DOI10.1007/s11433-010-0010-8
收录类别SCI
语种英语
WOS记录号WOS:000280291800011
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文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7718
专题空间科学研究部
作者单位1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
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Wang TianZhou,Qiu YuLei,Cai HongBo,et al. A fast onboard star-extraction algorithm optimized for the SVOM Visible Telescope[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2010,53:51-55.
APA Wang TianZhou,Qiu YuLei,Cai HongBo,&Deng JingSong.(2010).A fast onboard star-extraction algorithm optimized for the SVOM Visible Telescope.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,53,51-55.
MLA Wang TianZhou,et al."A fast onboard star-extraction algorithm optimized for the SVOM Visible Telescope".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 53(2010):51-55.
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