微光凝视成像曝光自适应研究

发布时间：2018-06-24 02:52

本文选题：微光成像 + 自适应曝光　；参考：《光子学报》2016年12期

【摘要】：为实现高分视频卫星微光条件下对目标进行长周期凝视曝光成像,设计了适应凝视跟踪稳像姿态变化的自适应曝光周期算法.建立卫星对地实时凝视跟踪数学模型,搭建矢量映射的速度匹配曝光成像关系,利用蒙特卡洛方法对卫星三轴姿态角和姿态角速度控制准确度在微光成像曝光时间内引起的像移量进行统计计算,分析了一定姿态控制准确度下满足高分卫星微光成像的曝光周期.最后,利用灵巧验证卫星进行微光成像曝光周期自适应稳像姿态的在轨试验.结果表明,卫星姿态控制准确度分别为0.08°与0.0088°/s和0.04°与0.003°/s时,对应的成像曝光时间分别为18ms和55.2ms,通过对微光成像的目标点进行分析,曝光过程中成像目标点的实际偏差像元量小于1个像元,此偏差对成像质量影响较小,成像影像的信噪比高.
[Abstract]:In order to realize the long-period staring exposure imaging of the target under the condition of low light level of high-score video satellite, an adaptive exposure period algorithm is designed to adapt to the attitude change of staring tracking image stabilization. The mathematical model of satellite real-time staring tracking is established, and the relationship of velocity matching exposure imaging with vector mapping is built. Based on the Monte Carlo method, the image shift caused by the control accuracy of the satellite triaxial attitude angle and attitude angular velocity during the exposure time of the LLL imaging is calculated statistically. The exposure period of high subdivision satellite LLL imaging under certain attitude control accuracy is analyzed. Finally, the dexterous verification satellite is used to carry out the on-orbit experiment of adaptive image stabilization in the exposure period of low light level (LLL) imaging. The results show that when the satellite attitude control accuracy is 0.08 掳and 0.0088 掳/ s and 0.04 掳and 0.003 掳/ s respectively, the corresponding imaging exposure time is 18ms and 55.2 Ms, respectively. In the process of exposure, the actual pixel deviation of the imaging target is less than 1 pixel, which has little effect on the imaging quality and the signal-to-noise ratio (SNR) of the imaging image is high.
【作者单位】：中国科学院长春光学精密机械与物理研究所;中国科学院大学;
【基金】：国家自然科学基金青年基金(No.61503360)资助~~
【分类号】：V445.8;TP391.41

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