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为提高微型星敏感器的质心定位精度,提出了一种利用外差式激光干涉装置标定图像传感器像素位置偏差的方法,并就像素位置偏差对星点像质心定位精度的影响进行了仿真研究。在噪声忽略不计的情况下,当像素位置偏差服从(-0.02,0.02)上的均匀分布时,补偿系统误差能够使星点定位精度从0.008 pixel提高到0.002 pixel。而如果加入服从N(0,5.52)的高斯白噪声,当像素位置偏差服从(-0.02,0.02)上的均匀分布时,补偿像素位置偏差能使定位精度从0.020 pixel提高到0.018 pixel;当像素位置偏差服从(-0.04,0.04)上的均匀分布时,补偿像素位置偏差能使定位精度从0.026 pixel提高到0.018 pixel,提高了31%。这说明标定像素位置偏差对提升质心定位精度有显著作用,为发展高精度微型星敏感器提供了一种新的技术手段。
In order to improve the centroid positioning accuracy of miniature star sensor, a method of using heterodyne laser interferometer to calibrate the pixel position deviation of image sensor is proposed. The influence of pixel position deviation on the positioning accuracy of centroid centroid is simulated. With negligible noise, compensating for systematic errors can improve the positioning accuracy of the satellite from 0.008 pixel to 0.002 pixel when the pixel position deviations are uniformly distributed on (-0.02, 0.02). If Gaussian white noise obeying N (0,5.52) is added, when the pixel position deviation is uniform distribution (-0.02,0.02), the compensation pixel position deviation can improve the positioning accuracy from 0.020 pixel to 0.018 pixel. When the pixel When the position deviation obeys the uniform distribution on (-0.04,0.04), the compensation pixel position deviation can improve the positioning accuracy from 0.026 pixel to 0.018 pixel, which is increased by 31%. This shows that calibration pixel position deviation to improve the positioning accuracy of centroid has a significant role in the development of high-precision micro-star sensor provides a new technical means.