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卫星平台的振动会导致曝光时间内光学相机和物体之间的相对运动,从而严重影响了成像质量。但实际中图像的退化形式较为复杂,而且很难确定退化图像的退化形式和退化参数,而图像的退化仿真为解决该问题带来了极大的便利。通过分析卫星平台振动规律及其对图像的影响,提出了一个新的概念———像移路径,并提出了基于像移矩阵的等权时间图像退化方法。该方法使得退化仿真过程综合了卫星的所有姿态和频段的振动带来的影响。因此,已知卫星振动函数和原始图像,即可仿真生成退化图像。通过仿真图像频谱特性的理论值与实验值的对比分析,验证了该仿真方法的可靠性。
The vibration of the satellite platform can cause relative motion between the optical camera and the object during the exposure time, which seriously affects the imaging quality. However, the actual image degeneracy is complicated, and it is difficult to determine the degenerate form and degradation parameters of the degenerate image. However, the degradation of the image has brought great convenience to solve this problem. By analyzing the satellite platform vibration law and its impact on the image, a new concept called image shift path is proposed, and a method of image weight reduction based on image shift matrix is proposed. This method allows the degenerate simulation process to integrate the effects of all the satellite satellites’ vibrations and vibrations. Therefore, the satellite vibration function and the original image are known to generate the degraded image. By comparing the theoretical and experimental values of the spectral characteristics of the simulated images, the reliability of the simulation method is verified.