CAJ | 학술논문

太阳图像质心提取是利用太阳敏感器进行天文导航的关键技术之一，直接决定了太阳敏感器的观测精度。针对超大视场太阳敏感器非圆形太阳图像质心提取问题，首先提出像面椭圆拟合算法，较好地解决了椭圆及近似椭圆形太阳图像的质心提取问题，然后进一步提出了球面圆拟合算法。该算法根据相机的投影和畸变模型，将太阳图像的边缘点映射到物方空间，对物方空间的边缘点进行球面圆拟合，从而确定太阳质心位置。在估计球面圆拟合算法的精度时，需要将太阳质心位置映射回像面。理论上，球面圆拟合算法不再需要顾及太阳图像的形状，算法更为严谨。将椭圆拟合算法和球面圆拟合算法应用到实测的太阳图像质心提取中。结果表明，椭圆拟合算法更适合处理半视场角70°～803．°的太阳图像，平均精度约为00．75 pi x el s；球面圆拟合算法更适合处理半视场角大于803．°的太阳图像，平均精度约为00．82 pi x el s。
태양도상질심제취시이용태양민감기진행천문도항적관건기술지일，직접결정료태양민감기적관측정도。침대초대시장태양민감기비원형태양도상질심제취문제，수선제출상면타원의합산법，교호지해결료타원급근사타원형태양도상적질심제취문제，연후진일보제출료구면원의합산법。해산법근거상궤적투영화기변모형，장태양도상적변연점영사도물방공간，대물방공간적변연점진행구면원의합，종이학정태양질심위치。재고계구면원의합산법적정도시，수요장태양질심위치영사회상면。이론상，구면원의합산법불재수요고급태양도상적형상，산법경위엄근。장타원의합산법화구면원의합산법응용도실측적태양도상질심제취중。결과표명，타원의합산법경괄합처리반시장각70°～803．°적태양도상，평균정도약위00．75 pi x el s；구면원의합산법경괄합처리반시장각대우803．°적태양도상，평균정도약위00．82 pi x el s。
Sun image centroid algorithm is one of the key technologies of celestial navigation using sun sensors ,which directly determine the precision of the sensors .Due to the limitation of centroid algorithmfor non‐circular sun image of the sun sensor of large field of view,firstly ,the ellipse fitting algorithm is proposed for solving elliptical or sub‐elliptical sun images .Then the spherical circle fitting algorithm is put forward .Based on the projection model and distortion model of the camera ,the spherical circle fitting algorithm is used to obtain the edge points of the sun in the object space ,and then the centroid of the sun can be determined by fitting the edge points as a spherical circle .In order to estimate the precision of spherical circle fitting algorithm ,the centroid of the sun should be projected back to the image space . Theoretically ,the spherical circle fitting algorithm is no longer need to take into account the shape of the sun image ,the algorithm is more precise .The results of practical sun images demonstrate that the ellipse fitting algorithm is more suitable for the sun image with 70°~80 .3° half angle of view , and the mean precision is about 0 0.75 pixels;the spherical circle fitting algorithmis more suitable for the sun image with a half angle of view larger than 80 3.° ,and the mean precision is about 0 0.82 pixels .