The Image Field Rotation of the Auto-Guide Unit of the Solar Telescope in Yunnan Observatory

The Auto Guide Unit of the solar telescope is a feedback track system with high precision.Under the open loop control, it is difficult to reach tracking demand of the solar telescope;therefore, it is necessary to use the auto-guide unit as the feedback control system for the target position.In the process of tracking, there is an image rotation of the auto-guide unit, and if the effect of the image rotation is not considered, it can disable the auto-guide unit, therefore it s necessary to resolve the image rotation of the auto-guide unit.In this paper, the analysis of image rotation about the auto-guide unit of the solar telescope has been given theoretically, and the specific formula of the movement about the image in the CCD has been worked out.