The Influence of Image Rotation on Accuracy of Stabilization System of AIMS Solar Telescope

Aiming at the phenomenon of image rotation when the coude system of AIMS solar telescope tracks the targets, the influence of image rotation on the correction accuracy of image stabilization system is studied. Firstly, the calculation error caused by the image rotation of the covariance function in Fourier domain and the absolute difference function at different atmospheric turbulence intensity and different detection window sizes is theoretically analyzed. Then, the dynamic optical model of AIMS solar telescope is established in the optical analysis software ASAP. The imaging shift and rotation by the coude system error in the real-time tracking of the sun's motion are calculated. The maximum shift and rotation of the image within half an hour are about 0.3 mm and 200″ respectively. The results show that under the existing error distribution situation, the image rotation caused by the assembly error has little effect on the image stabilization accuracy. In addition, in order to obtain higher image stabilization accuracy, the covariance function in Fourier domain is the preferred image stabilization algorithm. And the detection window with 128×128 pixels should be selected as far as the hardware processing speed allows.