| 基于双正交小波的星点细分定位方法研究 |
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| 引用本文： | 李广泽,刘金国,郝志航.基于双正交小波的星点细分定位方法研究[J].光学精密工程,2005,13(Z1):217-221. |
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| 作者姓名： | 李广泽 刘金国 郝志航 |
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| 作者单位： | 1. 中国科学院,长春光学精密机械与物理研究所,吉林,长春,130033;中国科学院,研究生院,北京,100039
2. 中国科学院,长春光学精密机械与物理研究所,吉林,长春,130033 |
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| 摘 要： | 在星敏感器工作过程中,星点目标亚像元质心定位的准确性直接影响星识别的准确性,同时也决定了星敏感器姿态测量的有效性.带阈值的质心法是星点目标细分定位的较理想方法,具有较强的抗噪声干扰能力.在双正交小波变换的基础上提出基于双正交小波的自适应小波阈值法.与传统的IIR阈值法比较,不仅星点目标提取更加准确,而且位置测量精度更高.
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| 关 键 词： | 星敏感器 亚像元定位 带阈值质心算法 双正交小波 |
| 文章编号： | 1004-924(2005)增-0217-05 |
| 收稿时间： | 2005/7/20 |
| 修稿时间： | 2005年7月20日 |
Research of subpixel subdivision location algorithm for star image based on biorthogonal wavelet |
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| LI Guang-ze,LIU Jin-guo,HAO Zhi-hang.Research of subpixel subdivision location algorithm for star image based on biorthogonal wavelet[J].Optics and Precision Engineering,2005,13(Z1):217-221. |
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| Authors: | LI Guang-ze LIU Jin-guo HAO Zhi-hang |
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| Affiliation: | LI Guang-ze~ |
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| Abstract: | For star sensor,the accuracy of subpixel centroid location for star image directly affects the accuracy of star identification,meanwhile also determines the effective of attitude measurement.The threshold centroid algorithm is a traditional method for subpixel location and is widely used in star sensors.Although it has more powerful anti-noise performance,there are several disadvantages such as poor faint star detection capability,low position measure precision. In this research,a method for subpixel centroid locatin by taking advantage of biorthogonal wavelet is presented in detail.The experiment results have shown that this algorithm not only greatly improves the accuracy of extraction of faint star objective than traditional IIR centroid method,but also enhances star positon measure refinement. |
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| Keywords: | star sensor subpixel location threshold centroid algorithm biorthogonal wavelet |
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