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详细介绍了一种星敏感器像素频率误差补偿方法并结合实际实验数据对其补偿效果进行验证。首先依据阈值分割的星点提取算法,分析了像素频率误差产生的几个主要原因。然后改进原有的星点质心定位点扩散函数,提出了一种基于亚像元坐标的像素频率误差补偿方法。最后通过星敏感器微步距实验,与正弦曲线法比较。实验结果表明:在视场中心区域,使用该方法对采样点补偿后像素频率误差减少了65.2%,优于正弦曲线法的52.7%;使用视场中心的误差补偿公式对视场边缘的采样点补偿,像素频率误差减少58.7%,优于正弦曲线法的41.9%。由实验结果可得:较之于正弦曲线法,该误差修正方法不仅具有更好的误差补偿效果,而且在视场范围内具有较强的通用性。
A method of compensating pixel frequency error of star sensor is introduced in detail, and its compensation effect is verified with actual experimental data. Firstly, based on the star point extraction algorithm of threshold segmentation, several main causes of pixel frequency error are analyzed. Then, the original diffuse function of the centroid of the star point is improved, and a pixel frequency error compensation method based on the sub-pixel coordinates is proposed. Finally, through the star sensor micro-step experiment, compared with the sinusoidal method. Experimental results show that this method reduces the pixel frequency error by 65.2% after sampling point compensation, which is 52.7% better than the sinusoidal method in the center of the field of view. Using the error compensation formula of the field of view, Compensation, pixel frequency error reduction of 58.7%, better than the sinusoidal method of 41.9%. The experimental results show that, compared with the sinusoidal method, the error correction method not only has better error compensation effect, but also has strong versatility in the field of view.