摘要
为提高数字太阳敏感器的角度测量精度,降低计算量,提高运算速度,选用矩法进行太阳成像质心的估算。针对矩法对图像背景敏感的缺点,考虑数字太阳敏感器所成图像背景大而有效亮斑小的特点,对矩法进行修正以消除背景影响,通过小孔衍射的计算机仿真结果确定修正矩法中的关键参数。在数字太阳敏感器的标定实验中,用修正矩法处理图像,分析了影响质心精度的因素,结果表明修正矩法在很大程度上消除了背景对质心估算精度的影响。综合各种误差因素后,在整个±64°视场内太阳敏感器成像质心的估算精度达到0.02像素。
The moment method was used to estimate the centroid in a digital sun sensor to increase the angle measurement accuracy and computation speed. Since the moment method is sensitive to the image background and digital sun sensor images have large backgrounds, the moment method was modified to eliminate the background effect. A pinhole diffraction model was used to define several key indexes in the modified moment method. Results from digital sun sensor calibration experiments show that the image background is almost eliminated with the digital sun sensor having a centroid estimation accuracy of 0.02 pixels over the entire ±64° field of view.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第5期625-628,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"九七三"重点基础研究项目
关键词
修正矩法
质心估算
数字太阳敏感器
小孔衍射
标定实验
modified moment
centroid estimation
digital sun sensor
pinhole diffraction
calibration experiment
