实现弱星提取及质心定位的帧间窗口移位灰度叠加法

星敏感器在动态跟踪模式下, 移位星像的信噪比衰减, 弱星难以提取, 当探测星数降为2颗时, 定姿误差加大。鉴于对齐灰度叠加不能显著提高动态星像的信噪比, 故提出一种帧间窗口移位灰度叠加法。通过对备选弱星窗口灰度数据进行流水缓存并移位叠加, 增强弱星灰度及信噪比, 使其满足探测阈值条件, 确保星敏感器视场中始终保持不少于3颗星。仿真结果表明: 4帧灰度叠加后弱星信噪比较单帧星图提高了1倍多, 增加一颗观测星后定姿精度更高。

Abstract

In the dynamic tracking mode of a star sensor, the signal noise ratio(SNR) of the shifted star image attenuates resulting in difficulty of dim star extraction. When the number of extracted stars drops to 2, attitude error increases. Obviously for the dynamic star image the aligned pixel gray superposition method was incapable of increasing its SNR remarkably, so a novel inter-frame shifted window gray superposition method was proposed instead. This novel method raised the gray level and the SNR of a dim star by means of superposing pixel gray of inter-frame window area, in a shifted style rather than an aligned one, during which the gray data of the shifted windows of several successive frames were stored into a cache in a pipeline mode. So the peak gray value of a dim star was enhanced and turned to be over the detecting threshold, and no less than 3 stars in the FOV can be finally guaranteed to be used in attitude calculation. The simulation results manifest that the SNR of the dim star image is increased more than 1 times after applying the new algorithm with 4 frames, thus a higher precision can be achieved by the three-star improved attitude determination due to the added one star.

参考文献

[1] 刘金国, 李杰, 郝志航. APS星敏感器探测灵敏度研究[J]. 光学精密工程, 2006, 14(4): 553-557.

Liu Jinguo, Li Jie, Hao Zhihang. Study on detection sensitivity of APS star tracker[J]. Optics and Precision Engineering, 2006, 14(4): 553-557. (in Chinese)

[2] 许威. 星点快速提取与高精度定位技术研究[D]. 杭州: 浙江大学, 2013: 16-18.

Xu Wei. Star fast extraction and high accuracy centroid estimation of star camera[D]. Hangzhou: Zhejiang University, 2013: 16-18. (in Chinese)

[3] 韩艳丽, 刘峰. 基于三角形匹配的空间小目标检测算法[J]. 红外与激光工程, 2014, 43(9): 3134-3140.

Han Yanli, Liu Feng. Small targets detection algorithm based on triangle match space[J]. Infrared and Laser Engineering, 2014, 43(9): 3134-3140. (in Chinese)

[4] Zhang Guangjun, Wei Xinguo, Jiang Jie. Full-sky autonomous star identification based on radial and cyclic features of star pattern[J]. Image Vision Computer, 2008, 26(7): 891-897.

[5] 陈浩, 谭久彬. 一种改进的TRIAD飞行器姿态确定方法[J]. 系统仿真学报, 2008, 20(8): 2101-2104.

Chen Hao, Tan Jiubin. Improved TRIAD algorithm for spacecraft attitude determination[J]. Journal of System Simulation, 2008, 20(8): 2101-2104. (in Chinese)

[6] 刘晓辉, 党亚民, 王潜心, 等. 双基线姿态确定三种算法的比较分析[J]. 大地测量与地球动力学, 2013, 33(1): 123-127.

Liu Xiaohui, Dang Yamin, Wang Qianxin, et al. Analysis of three algorithms of attitude determination based on two baselines[J]. Journal of Geodesy and Geodynamics, 2013, 33(1): 123-127. (in Chinese)

[7] 曾芬. 高精度星相机图像处理技术[D]. 长春: 中国科学院长春光学精密机械与物理研究所, 2014: 38-42.

Zeng Fen. High accuracy star camera image processing technology[D]. Changchun: Changchun Institute of Optics, Fine Mechanics and Pyhsics, Chinese Academy of Sciences, 2014: 38-42. (in Chinese)

[8] 胡晓东, 胡强, 雷兴, 等. 一种用于白天星敏感器的星点质心提取方法[J]. 中国惯性技术学报, 2014, 22(4): 481-485.

Hu Xiaodong, Hu Qiang, Lei Xing, et al. Method of star centroid extraction used in daytime star sensors[J]. Journal of Chinese Inertial Technology, 2014, 22(4): 481-485. (in Chinese)

[9] Sun Kelin, Zhou Weichao, Wu Qinzhang, et al. Star-point moving target detection and tracking on star space background[J]. International Journal of Digital Content Technology and its Applications, 2012, 6(5): 124-132.

[10] 王学伟, 王春歆, 张玉叶. 点目标图像信噪比计算方法[J]. 电光与控制, 2010, 17(1): 18-21.

Wang Xuewei, Wang Chunxin, Zhang Yuye. Research on SNR of point target image[J]. Electronics Optics and Control, 2010, 17(1): 18-21. (in Chinese)

[11] 程源. 多帧叠加及中值滤波在微光图像降噪中的应用[J]. 无线电通信技术, 1997, 23(3): 34-36.

Cheng Yuan. The application of multi-frame superposition and median filtering in LLL image denoise[J]. Radio Communications Technology, 1997, 23(3): 34-36. (in Chinese)

[12] Liebe C C. Accuracy performance of star trackers-a tutorial[J]. IEEE Transactions on Aerospace and Electronic Systems, 2002, 38(2): 587-599.

[13] Xu Wei, Li Qi, Feng Huajun, et al. A novel star image thresholding method for effective segmentation and centroid statistics[J]. Optik, 2013, 124(20): 4673-4677.

[14] 钟红军, 卢欣, 李春江, 等. 新型分体式星敏感器设计及其应用[J]. 红外与激光工程, 2014, 43(4): 1278-1283.

Zhong Hongjun, Lu Xin, Li Chunjiang, et al. Design and applications of novel separated type star tracker[J]. Infrared and Laser Engineering, 2014, 43(4): 1278-1283. (in Chinese)

[15] 王海涌, 费峥红, 王新龙. 基于高斯分布的星像点精确模拟及质心计算[J]. 光学精密工程, 2009, 17(7): 1672-1677.

Wang Haiyong, Fei Zhenghong, Wang Xinlong. Precise simulation of star spots and centroid calculation based on Gaussian distribution[J]. Optics and Precision Engineering, 2009, 17(7): 1672-1677. (in Chinese)

[16] 魏新国, 张广军, 江洁. 星敏感器中星图图像的星体细分定位方法研究[J]. 北京航空航天大学学报, 2003, 29(9): 812-815.

Wei Xinguo, Zhang Guangjun, Jiang Jie. Subdivided locating method of star image for star sensor[J]. Journal of Beijing University of Aeronautics and Astronautics, 2003, 29(9): 812-815. (in Chinese)

[17] 章仁为. 卫星轨道姿态动力学与控制[M]. 北京: 北京航空航天大学出版社, 1998.

Zhang Renwei. Dynamics and Control of Satellite Orbit and Attitude[M]. Beijing: Beihang Unversity Press, 1998. (in Chinese)

[18] Wang Haiyong, Xu Ershuai, Li Zhifeng, et al. Gaussian Analytic Centroiding method of star image of star tracker[J]. Advances in Space Research, 2015, 56(10): 2196-2205.

高自谦, 王海涌, 高洪民, 秦天沐, 李晶津. 实现弱星提取及质心定位的帧间窗口移位灰度叠加法[J]. 红外与激光工程, 2017, 46(2): 0226001. Gao Ziqian, Wang Haiyong, Gao Hongmin, Qin Tianmu, Li Jingjin. Inter-frame shifted window gray superposition method of dim star image extraction and centroiding[J]. Infrared and Laser Engineering, 2017, 46(2): 0226001.

实现弱星提取及质心定位的帧间窗口移位灰度叠加法

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