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Vibration interference reduces the precision of the control system and leads to the instability of the satellite optical communication link. So how to improve the tracking accuracy of the terminal system under vibration conditions is an important work for the ground test of satellite laser communication systems. In this paper, the tracking characteristic based on the platform vibration is introduced for coarse tracking and the combination of coarse and fine tracking, we propose a structural decoupling approach and iterative learning control scheme using sliding-mode control to investigate the performance of the tracking system in order to achieve the error minimization, and further to improve the system performance. The scheme is introduced to increase the tracking accuracy and the robustness of the system against external disturbances. The experimental results of the steady-state tracking response and the high tracking precision are carried out on a 4.62 km bidirectional free space laser link experiment, and the obtained test results (less than  $2~\mu $ rad) demonstrate the effectiveness of the proposed control scheme in suppressing oscillation. This new method is good for the ground test of the satellite laser communication systems.

A Novel Approach for Optimization Control of Dynamic Tracking With Platform Vibration in the Ground Test of Satellite Laser Communication Systems