高分CMOS相机垂轨引导凝视搜索成像设计

发布时间：2018-01-08 04:04

本文关键词：高分CMOS相机垂轨引导凝视搜索成像设计　出处：《光学学报》2017年07期 　论文类型：期刊论文

【摘要】：为实现高分面阵相机对垂直轨道方向的长条带区域一定重叠率的凝视搜索成像,设计了凝视姿态与地速运动互补偿的垂轨凝视搜索模型。通过划分垂轨长条带区域与构建目标三维运动速度,设计成像实时姿态变化与地球自转互补偿的引导策略,计算垂轨自适应搜索成像参数与实时变化指向姿态,并对卫星姿控精度对成像的影响进行了分析。最后,利用姿控三轴气浮仿真系统与CMOS相机对曲面LED目标模拟系统进行等比缩放物理仿真实验。结果表明:垂轨凝视自适应搜索成像参数为0.95时,可实现垂轨方向边缘帧间重叠率为85%、中心帧间重叠率为100%的渐变垂轨长条带成像区域,比全凝视成像区域扩大近4倍,姿控精度和姿态稳定性优于0.05°与0.003(°)s~(-1)时,像移失配量小于0.9pixel,对应的调制传递函数值为0.1559。
[Abstract]:In order to realize the staring search imaging of the long strip region in the vertical orbit direction of the high plane array camera with a certain overlap rate. The searching model of vertical orbit gazing is designed, which compensates the gazing attitude and the ground velocity. By dividing the vertical rail strip region and constructing the target 3D velocity. Design the guidance strategy of imaging real-time attitude change and earth rotation compensation, calculate the vertical orbit adaptive search imaging parameters and real-time change pointing attitude, and analyze the influence of satellite attitude control accuracy on the imaging. Finally. By using the attitude control three-axis air flotation simulation system and the CMOS camera, the physical simulation experiment of the curved surface LED target simulation system is carried out. The results show that the vertical orbit gaze adaptive search imaging parameter is 0.95. The vertical rail edge frame overlap rate is 85 and the center frame overlap rate is 100%, which is nearly four times larger than the full gaze imaging area. When the precision of attitude control and attitude stability are better than 0.05 掳and 0.003 (掳~ 0. 003), the mismatch of image shift is less than 0.9 pixel, and the corresponding value of modulation transfer function is 0.1559.
【作者单位】：中国科学院长春光学精密机械与物理研究所;小卫星技术国家地方联合工程研究中心;长春理工大学理学院;中国科学院大学;
【基金】：国家自然科学基金青年基金(61503360)
【分类号】：TP751;V443.5
【正文快照】： 3中国科学院大学,北京100049;4小卫星技术国家地方联合工程研究中心,吉林长春1300330711002-1随着全球高分辨率遥感推扫卫星全面进入亚米级分辨率时代,2013年,Skybox imaging公司发射了首颗SkySat米级视频卫星,该卫星对地观测记录了运动目标信息,开创了动态遥感的新纪元。视频

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