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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。
In order to improve the angle measurement accuracy of the digital sun sensor, reduce the calculation amount and speed up the operation, the moment method of the sun is used to estimate the centroid of solar imaging. Aiming at the shortcomings that the moment method is sensitive to the background of the image, considering the large and effective bright background caused by the digital sun sensor, the moment method is corrected to eliminate the influence of the background. The correction moment method is determined by computer simulation of the aperture diffraction. In the key parameters. In the calibration experiment of digital solar sensor, the image is processed by the method of moment correction, and the factors that affect the accuracy of centroid are analyzed. The results show that the correction moment method can largely eliminate the influence of background on the accuracy of centroid estimation. Combined with various error factors, the estimated accuracy of the sun-centroid imaging centroid over the entire ± 64 ° field of view reaches 0.02 pixels.