Satellite image restoration based on measured vibration information and requirements

Aiming at the practical application problem of restoration for degraded image owing to satellite vibrations, a restoration method based on measured vibration information and the specification requirements were proposed. Firstly, effects of vibrations on image quality were analyzed based on imaging physical-process of TDICCD push-broom system. Then the methods of image restoration and corresponding parameter calculation were presented. Secondly, influence law of vibration measurement error on restored image quality were discussed in the cases of different vibration frequencies, amplitudes and TDIs. Finally, the quantitative relation between the measurement error and restoration performance was established by experiments. Experimental results indicate that the restored images can satisfy the practical requirement that SSIM is higher than 0.9 and geometric distortion is less than 0.1, when the measurement error should be less than 0.05 pixel, and vibrations with frequencies over 150 Hz should be isolated.