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锥摆扫一体化空间相机成像模式设计

Design of imaging model for cone-pendulum scanning integrated space camera

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【作者】 支政曲宏松李静张贵祥

【Author】 ZHI Zheng;QU Hong-song;LI Jing;ZHANG Gui-xiang;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences;University of Chinese Academy of Sciences;Key Laboratory of Space-based Dynamic & Rapid Optical Imaging Technology,Chinese Academy of Sciences;Beijing Institute of Tracking and Telecommunications Technology;

【通讯作者】 曲宏松;

【机构】 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中国科学院天基动态快速光学成像技术重点实验室北京跟踪与通信技术研究所

【摘要】 针对高分辨相机难以实现超宽覆盖的问题,本文设计了锥摆扫一体化成像模式。通过对锥摆扫一体化成像原理进行分析,建立了锥摆扫一体化成像模型;然后,设计了最佳地面轨迹模型,并分析了轨道速度、平台旋转角速度和摆扫转动角速度的关系,并基于地面轨迹给出了曝光时间、帧频的计算方案。最后,通过MATLAB进行算例仿真,并对地面覆盖宽度和地面像元分辨率进行分析。结果表明:在轨道高度为500 km,像素尺寸为2.5μm,焦距为360 mm,像元数为5 120×5 120时,取相机安装倾角为30°,摆扫成像帧数为10,地面覆盖宽度达到1 105.7 km,是星下点推扫成像的31.1倍,并且地面像元分辨率在6.4 m以下。锥摆扫一体化成像模式可以完全覆盖地面目标,并且在保证一定分辨率的条件下大幅增大幅宽。

【Abstract】 Achieving super-wide coverage for high-resolution cameras is difficult. To address this difficulty,this study designs a cone-pendulum scanning integrated imaging mode. First,by analyzing the principle of cone-pendulum scanning integrated imaging,a cone-pendulum scanning integrated imaging model was established. Then,the optimal ground trajectory model was designed,and the relationship between the orbital velocity,angular velocity of the platform rotation,and angular velocity of the pendulum scanning rotation was analyzed. Simultaneously,based on the ground trajectory,a calculation scheme of exposure time and frame frequency was provided. Finally,MATLAB was used to perform simulations,and the ground coverage width and ground pixel resolution were analyzed. The results show that when the orbital altitude is 500 km,pixel size is 2. 5 μm,focal length is 360 mm,and pixel number is 5 120×5 120,then the camera installation angle is 30°,number of frames of pendulum scanning imaging is 10,ground coverage width is 1 105. 7 km,which is 31. 1 times that of the image sub-satellite point push scanning imaging,and ground sample distance(GSD)is less than 6. 4 m. The cone-pendulum integrated imaging mode can completely cover the ground target and considerably increase the width for specific resolutions.

【基金】 国家自然科学基金资助项目(No.62075219,No.61805244);吉林省重点科技研发计划资助项目(No.20190303094SF)
  • 【文献出处】 光学精密工程 ,Optics and Precision Engineering , 编辑部邮箱 ,2021年03期
  • 【分类号】V443.5
  • 【被引频次】5
  • 【下载频次】115
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