Error tolerance and effects analysis of satellite vibration characteristics and measurement error on TDICCD image restoration

Abstract Satellite vibrations during exposure time could lead to image motion degradation, and image restoration methods are commonly used to compensate for such degradation. However, effects of space-variant image degradation characteristics due to the vibrations for time delayed integration (TDI) camera and real-time measurement errors of the vibration motion are rarely taken into account during the restoration process, which will bring final restored image processing error. In this paper, the analytical model of vibration motion is first deduced mathematically and then the space-variant modulation transfer function (MTF) degradation and corresponding influence factors are analyzed. Meanwhile, the effect of measurement errors is theoretically explained on that basis of high-performance restoration model. Then the effects of the space-variant MTF and measurement errors for different frequencies, amplitudes and sampling rate on image restoration performance are further presented. Finally, influences of above factors affecting restoration quality are verified and the relationships between them are established experimentally. Subsequently, the error tolerance of satellite vibration itself and measurement specifications are quantitatively generated from the practical application point of view, which can provide a valuable reference for future satellite platform design and the specifications determining of TDICCD camera.

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