Image Degradation Caused By Satellite Swing And Its Correction

Satellite camera imaging method according to the different imaging methods can be divided into push-sweep imaging and swing-type imaging.Due to the sweep of the signal in the ability to capture and special parts easy to damage the problem,pushing the current imaging when the mainstream imaging.In the process of satellite operation,because the satellite itself is not in a fixed state,the satellite exists the stars tilt,roll,swing and so on.Satellite swing on the CCD sensor camera imaging results have a great impact,will cause the degradation of the scanned image,will cause the image can not distinguish.First of all,we have analyzed the state of motion of satellites,elaborated the reason why the satellite exists in the space swing,and analyzed the state of the satellite swing.The performance of CCD and CMOS image sensor is analyzed and compared,and the reason of spatial imaging with CCD sensor is pointed out.Most of the current space imaging technology using CCD camera push imaging.A model for satellite imaging is established to study the factors that affect imaging.Through the establishment of the ideal imaging model,in the case of interference with other factors to study the impact of satellite swing on the image.The parameters of the swing are divided into the swing period and the swing amplitude.The influence of the swing period and the swing amplitude on the imaging of the satellite is analyzed by using the separation variable method.When the amplitude of the swing is increased from small to large,the change of the imaging effect and the change of the imaging effect are studied.The reason of the degradation of the scanned image is analyzed by the difference of image quality and the variation of the image in different situations such as different amplitude,integer period and non-integer period.The mapping relationship between the ground pixel and the scanning sampling pixel is studied,The image degradation caused by the use of inverse mapping is proposed.The image is distorted by the swing of the satellite along its orbit.We experimentally simulate this situation and study the effect of satellite wobble on image quality.For Europe and the United States found that even for the strict cyclical swing,the image quality will be seriously degraded.Further studies have shown that it is possible to correct the degradation of this image if the oscillating profile is completely known.