基于天基光学探测图像初析南大西洋异常区影响

发布时间：2018-12-25 11:03

【摘要】：文章针对目前在轨运行的高灵敏度探测类可见光遥感器经过南大西洋异常区(south Atlantic Anomaly,SAA)时出现的探测能力降低、目标无法识别等现象,通过卫星在轨获取的SAA天基探测图像研究图像中出现的异常现象机理;提出了基于CCD探测器固有暗像元区的图像特征变化开展SAA影响评估的方法,根据在轨图像暗像元区的均值和标准差、图像区的热像素及活像元等特征参数的统计分析,判断经过SAA过程中连续获取的图像中出现显著影响时的拐点,通过曲线拟合估算出该轨道高度的SAA空间分布特征和边界,依此进一步提出利用在轨天基探测图像给出测量影响该轨道高度卫星SAA区域边界的简单方法;最后,基于SAA对天基探测器件的影响分析结果和认识,给出了高灵敏度探测类卫星避免或消除SAA影响的改进措施和建议。文章采用的数据分析和评估方法为提升SAA对天基探测影响的认识,以及下一步有效开展空间碎片探测工作提供参考。
[Abstract]:This paper aims at the phenomena that the detection ability of the high sensitivity visible light remote sensor in orbit is reduced and the target can not be recognized when it passes through the South Atlantic anomaly area (south Atlantic Anomaly,SAA). The mechanism of abnormal phenomena in SAA space-based detection images obtained by satellite in orbit is studied. This paper presents a method of SAA impact assessment based on the change of image features in the intrinsic dark pixel area of CCD detector. The statistical analysis of the mean and standard deviation of dark pixel region of the in-orbit image, the thermal pixel and live pixel of the image area, and so on, is presented. To judge the inflection point of the images continuously obtained by SAA, and to estimate the SAA spatial distribution and boundary of the orbit height by curve fitting. Based on this, a simple method for measuring the boundary of the SAA region of the satellite affected by the orbital altitude is presented by using the space-based detection image in orbit. Finally, based on the results and understanding of the influence of SAA on space-based detectors, the improvement measures and suggestions on how to avoid or eliminate the effects of SAA on high-sensitivity detection satellites are given. The data analysis and evaluation method used in this paper provides a reference for enhancing the understanding of the impact of SAA on space-based detection and for carrying out the space debris detection work effectively in the next step.
【作者单位】：上海微系统与信息技术研究所;上海微小卫星工程中心;中国科学院大学;
【分类号】：P171

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