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北京航空航天大学 宇航学院 北京,100191
[ "王海涌 (1969-),男,河北唐山人,博士,讲师,主要从事CCD精密测量、天文导航及组合导航技术的研究" ]
[ "E-mail: why@buaa.edu.cn 费峥红 (1983-),女,山东烟台人,硕士研究生,主要从事星敏感器和天文导航技术的研究" ]
[ "E-mail: feizhenghong@163.com 张 超 (1985-),男,河北张家口人,学士,主要从事星敏感器方面的研究。E-mail: shijiazhuang7@sina.com" ]
收稿日期:2008-04-16,
修回日期:2008-07-09,
纸质出版日期:2009
移动端阅览
王海涌, 费峥红, 张超. 改进的基于主星的星图识别算法[J]. 光学精密工程, 2009,17(1): 220-224
WANG Hai-yong, FEI Zheng-hong, ZHANG Chao. An improved star pattern identification algorithm based on main star[J]. Editorial Office of Optics and Precision Engineering, 2009,17(1): 220-224
为了建立更高效的星图识别算法
设计了一种以主星与邻星角距为识别特征的星图识别算法。构建了导航星库
将所有邻星与主星角距进行量化编码
并按照从小到大的顺序排列为特征模式字符串
串尾附加字符串长度项为聚簇索引
借以提高导航星库的检索速度;然后
利用改进的KMP字符串识别方法对观测星进行匹配识别。当存在2 pixels的高斯位置噪声时
该算法成功识别率高于97.38%
导航星库的存储容量为149.4 kB。在Pentium 1.6 GHz PC机上随机识别1 250幅星图
平均识别时间为42.78 ms。此识别算法对观测图像具有旋转不变性
对位置和星等噪声都有很好的鲁棒性
且导航星库的存储容量小、检索效率高、实时性好。
To establish a more effective string pattern matching algorithm
a new improved star identification algorithm taking angular distances between main star and neighbor stars as recognition characteristics is designed. A guide star catalogue is constructed
and the angular distance values between main star and neighbor stars are encoded to quantized codes; then each code in characteristic character strings is rearranged from small to large in sequence. A string length code is appended to the end of the string to improve search speed of guide star catalogue
and so far the main stars neighbor pattern is finished. Finally
an improved string matching algorithm based on KMP is proposed to identify the corresponding matches to the measured star in the whole guide star patterns. The identification rate of this algorithm is greater than 97.38% when the Gauss noise of position error is 2 pixels. 1 250 star maps are identified randomly on Pentium 1.6 GHz PC
and the average identification time is 42.78 ms. This algorithm has rotation invariability
good robustness and synchronization. The catalogue storage content is only 149.4 kB
so it can offer a higher retrieval efficiency.
房建成,全伟,孟小红. 基于Delaunay三角剖分的全天自主星图识别算法[J]. 北京航空航天大学学报, 2005, 31(3): 312-315. FANG J CH, QUAN W, MENG X H. All-sky autonomous star map identification algorithm based on Delaunay triangulation cutting algorithm[J]. Journal of Beijing University of Aeronautics and Astronautics, 2005, 31(3): 312-315. (in Chinese)[2] 李立宏, 林涛, 宁永臣,等. 一种改进的全天自主三角形星图识别算法[J]. 光学技术, 2000, 26(4): 372-374. LI L H, LIN T, NING Y CH,et al.. Improved all-sky autonomous triangle star-field identification algorithm[J]. Optics Technique, 2000, 26(4): 372-374. (in Chinese)[3] 林涛, 周建林, 张钧萍,等. 四边形全天自主星图识别算法[J]. 宇航学报, 2000, 21(2): 82-85. LIN T, ZHOU J L, ZHANG J P,et al.. All-sky automated quaternary star pattern recognition[J]. Journal of Astronautics, 2000, 21(2): 82-85. (in Chinese)[4] 阚道宏. 空间飞行器姿态确定用的CCD星敏感器 . 北京: 北京控制工程研究所, 1992. KAN D H. CCD star sensor used for attitude determination in spacecrafts . Beijing:Beijing Institute of Control Engineering, 1992. (in Chinese)[5] 魏新国, 张广军, 江洁. 基于Log-Polar变换的星图识别算法[J]. 光学技术, 2006, 32(5): 678-681. WEI X G, ZHANG G J, JIANG J. A star identification algorithm based on Log-Polar transform[J]. Optical Technique, 2006, 32(5): 687-681. (in Chinese)[6] ROMAN N G,HWARREN W. Smithsonian astrophysical observatory star catalog (SAO) documentation[Z]. The Machine-Readable Version (Version 1990). NSSDC/WDC-A-R&S 89-08.[7] 房建成, 宁晓琳, 田玉龙. 航天器自主天文导航原理与方法 . 北京: 国防工业出版社,2006. FANG J CH, NING X L, TIAN Y L. Principle and Method of Autonomous Celestial Navigation of Spacecraft[M]. Beijing: National Defense Industry Press,2006. (in Chinese)[8] 李立宏, 徐洪泽, 张福恩. 一种改进全天自主栅格星图识别算法[J]. 光学技术,2000, 26(3): 204-210. LI L H, XU H Z, ZHANG F E. A kind of improved grid algorithm for all-sky autonomous star field identification[J]. Optical Technique, 2000, 26(3): 204-210. (in Chinese)
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