Image motion compensation method of high resolution space camera’s imaging with pitch angle
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摘要: 为了使高分率空间TDI(Time Delay and Integration) CCD相机适应卫星大俯仰姿态角,以增强空间遥感的时间分辨率,分析了卫星大俯仰姿态对高分辨空间相机成像的影响,使用光学投影方法,定性分析了俯仰成像时不同视场处的像移速度差异;根据TDI CCD工作方式,提出了横向像移图像生成原理,建立了横向像移图像的恢复模型,并完成了仿真验证和算法精度分析。分析结果表明:卫星俯仰姿态越大时,像面不同视场处横向像移速度差异增大;从仿真实验和精度分析可以看到俯仰成像时采用横向像移图像恢复方法可以得到无横向像移的图像,横向像移图像采集位数越高,恢复后的图像灰度值误差越小。横向像移图像恢复方法增强了空间相机对卫星大俯仰姿态的适应能力,极大地提高TDI CCD空间相机敏捷成像能力。Abstract: In order to make the high resolution space Time Delay and Integration(TDI) CCD camera adapt to the satellite pitch attitude angle and enhance real-time ability of space remote sensing, the influence of satellite's pitch angle on the imaging of high resolution space cameras was analyzed. The optical projection method was used to qualitatively analyze the differences of image motion velocities among different fields of view when imaging with pitch angles. Generating principle of image with traverse image motion was promoted according to the operation mode of TDI CCD. The model of recovering image with the traverse motion image was built, and the simulation experiment and its algorithm accuracy analysis were accomplished. The analysis result shows that the larger the pitch angle of satellite is, the more different the image motion velocity of various fields of view is. From the emulational experiment and accuracy analysis, it is seen that image without traverse image motion could be gotten by the method of image recovery with traverse image motion, and the higher the collection digit of image with traverse image motion is, the smaller the error of grew value is. The ability to adapt the pitch angle of satellites is enhanced by the method of recovery of image with traverse image motion, and the capability of agile imaging of TDI CCD space camera is greatly improved.
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Key words:
- space camera /
- imaging with pitch angle /
- traverse image motion /
- recovery of mistiness
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