The Experimental Study On Lucky Imaging Technology For Spatial Objects

The turbulence theory of the atmosphere and primary principle of lucky imaging are first introduced in this paper, and then the application conditions and processing flow of lucky imaging technology for spatial objects are presented. An experimental system of lucky imaging observation is built and the system error is analyzed and revised. It is shown that the system is capable of measuring the coherence length of the atmosphere and conducting the lucky imaging experiments for spatial objects. Based on this, the measurements of the atmospheric turbulence parameters near ground are taken and the image partition technology is investigated. The measurement results obtained at Changsha are reported and the impact of the atmospheric coherence length on the probability of"lucky image"is analyzed. A series of lucky imaging experiments are then implemented, including observations of the ISS and the moon. The experimental results indicate that lucky imaging technology can improve the imaging resolution of the ground-based optical systems for spatial objects. Finally, the sub-pixel image registration technique, the mutual information image registration method and the image enhancement method are studied respectively. The results show that the sub-pixel image registration technique can improve the image quality, the mutual information image registration method is more suitable for the sequential image registration of dynamic spatial objects, and the image enhancement method can improve the image quality of the lucky imaging results.