【作者】 孙荣煜； 赵长印； 侯永刚；

【Author】 Rongyu Sun 1,2,3 , Changyin Zhao 1,2 , Yonggang Hou 1,2,3 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, China 2. Key Laboratory of Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210008, China 3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China

【机构】 中国科学院紫金山天文台； 中国科学院空间目标与碎片观测重点实验室； 中国科学院大学；

【摘要】 传统天文定位方法采用底片常数模型,计算图像坐标与理想坐标的映射关系,最终实现图像坐标与赤道坐标的转换。其在光学测角资料的处理,星敏感器指向的归算中有广泛的应用。天文定位方法的实质为计算线性方程组的最小二乘解。实际处理过程中,恒星质心坐标的测量误差,定标星匹配错误,以及定标星数目不足等因素导致天文定位的精度降低。为了解决以上问题,实现高精度的天文定位,使用最优加权的最小二乘方法计算底片常数。试验结果表明,该方法降低了恒星位置误差对结果的影响,剔除了定标星的偶然匹配误差,提高了定位的精度,并能在定标星数目不够的情况下实现天文定位。因此,提高了观测数据利用效率以及观测的精度,在实际工作中有较高的应用价值。更多还原

【Abstract】 By the use of plate constant models, the traditional astronomical calibration method transforms the pixel coordinated to ideal coordinated, and finally the corresponding equatorial coordinated are obtained. Astronomical calibration is widely used in optical angle-based data reduction and orientation calculation for star sensor. Substantively the astronomical calibration is a solution estimation process of linear equations. However, in practical application, due to the measurement error of star centroid, the match up error of background stars and sometime short of stars, the precision of calibration is reduced. To solve these problems, the weighted least squares method is adopted. It’s demonstrated that the effects of star centroid errors are reduced, and the match up errors are also removed. And hence the precision of astronomical calibration is improved. In addition, the calibration can be performed without sufficient background stars. Hence, the efficiency and precision of data reduction are improved, the method is well suited for application.更多还原