摘要
高动态情况下,星点像斑在星敏感器探测器上会呈现出拖尾现象,使得星点质心无法被准确提取。针对上述难点,提出了一种高动态条件下基于差异哈希算法的星点质心提取方法。该方法分为三步:第一,建立动态星斑的数学模型;第二,利用差异哈希算法和汉明距离实现星跟踪窗口内星体目标的粗定位;第三,在粗定位区域使用阈值分割与连通域法提取星点质心。实验结果表明,该方法能够适应各种长度的曝光时间,并实现星敏感器在3(°)/s条件下的稳定跟踪。在曝光时间50ms,角速度3(°)/s的条件下,星对角距误差为13″,平均提取率为96%,相较于传统方法,分别提高了29.6%和22.9%。
In high dynamic conditions,the star spot exhibits a tailing phenomenon,which makes it impossible to accurately extract the star centroid.Aiming at the problem,this paper proposes a star spot centroid extraction method under high dynamic conditions based on the difference hash algorithm.The method is divided into three steps.Firstly,it establishes a mathematical model of dynamic star spots.Then using the difference hash algorithm and the Hamming distance,the coarse positioning of star targets is realized in the star tracking window.Finally,the threshold segmentation and the connected domain method are adopted to extract the star spot centroid in the coarse location area.The experimental results show that the proposed method can adapt to various exposure times,making the star sensor realize stable tracking at the angular velocity of 3(°)/s.When the exposure time is 50ms and the angular velocity is 3(°)/s,the angular distance error is 13″,and the average extraction rate is 96%,which is 29.6%and 22.9%better than the traditional method.
作者
潘迪
温兆伦
任平川
陆建
韩圣升
PAN Di;WEN Zhaolun;REN Pingchuan;LU Jian;HAN Shengsheng(Shanghai Aerospace Control Technology Institute,Shanghai 201109;Shanghai Key Laboratory of Aerospace Intelligent Control Technology,Shanghai 201109)
出处
《飞控与探测》
2022年第5期19-25,共7页
Flight Control & Detection
基金
国家重点研发计划课题(2019YFA0706002,2019YFA0706003)。
关键词
星敏感器
差异哈希
星点提取
星斑拖尾
阈值分割与连通域法
star sensor
difference hash
star centroid extraction
star spot tailing
threshold segmentation and connected domain method
