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紫外地球敏感器作为姿态测量装置具有广阔的应用前景,它与星敏感器配合可使航天器的指向精度和稳定度提高一个数量级。针对地球紫外中心指向高精度提取问题,提出了一种基于点Hough变换的紫外地平圆盘中心提取算法。首先,采用Sobel边缘算子、大津阈值分割、梯度锐化确定边缘快速提取算法,准确提取地球紫外临边特征。然后对临边边缘采用点Hough变换和除噪得到中心的精确位置。结果表明,该方法可实现高精度地球中心提取。
As an attitude measurement device, UV Earth sensor has broad application prospects. It can increase the pointing precision and stability of the spacecraft by an order of magnitude in cooperation with the star sensor. Aimed at the high precision extraction of the ultraviolet center of the earth, a new method based on the Hough transform of points is proposed. Firstly, Sobel edge operator, Otsu threshold segmentation and gradient sharpening were used to determine the fast edge extraction algorithm, which accurately extracted the edge features of the earth’s UV. Then the edge of the edge of the use of point Hough transform and noise removal to get the exact location of the center. The results show that this method can achieve high-precision extraction of the earth’s center.