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我国于2013年7月发射的天基空间碎片探测技术科学试验卫星,其在经过南大西洋异常区(SAA)时,所获取的图像数据出现异常。本文对星上CCD相机分别在非SAA区和SAA区时所拍摄图像的噪声,特别是其中的活像素点噪声和热像素点噪声的变化情况进行了统计分析,并对CCD相机的探测性能受SAA影响程度进行了评估。结果表明,在SAA区所拍摄的图像噪声值较非SAA区增加了5个电子,噪声中包含大量的活像素点和热像素点噪声,由于热像素点的长期存在性,对CCD相机的探测性能产生永久性的损伤。
In July 2013, China launched a space-based scientific research satellite for space debris detection that experienced abnormalities in image data obtained during its passing through the South Atlantic Anomaly (SAA). In this paper, the noise of the image taken by the onboard CCD camera in the non-SAA and SAA regions respectively, especially the change of the live pixel noise and the hot pixel noise, are analyzed statistically. The detection performance of the CCD camera is affected by The extent of SAA impact has been assessed. The results show that the image noise in the SAA region is increased by 5 electrons compared with the non-SAA region. The noise contains a large number of live pixels and hot pixel noise. Due to the long-term existence of hot pixels, the detection of the CCD camera Performance produces permanent damage.