Nowadays, Small satellites take with high precision and lightweight laser communication terminals become a hot research direction. In this work, Ping Ruan’s research team study factors affecting beam pointing performance and design a novel coarse pointing assembly (CPA) based on flexure technology. The beam pointing performance is influenced by three aspects: Rayleigh distribution pointing error composed of static bias error and dynamic jitter, coupled motion between optical terminal and satellite and point ahead angle. Based on beam pointing requirements, a novel 2-D spatial flexure parallel coarse pointing assembly is proposed. Firstly, the type synthesis of this mechanism is performed and the freedom is verified by screw method. Then the detailed structural design is given. The pivotal component-elliptic arc flexure hinge is optimized by genetic algorithm and its rotation accuracy is less than 10 um. A flexure rod is used in actuating legs which is made rigid by spatial pseudo-rigid body method in kinematic analysis process. Finally, both of forward kinematics and inverse kinematics have been mathematically analyzed and the virtual prototype simulation is performed in Adams. The rotational accuracy can reach to 3 mu rad. The position, velocity and acceleration motion curves shown that the platform moves stable which means it's easy to control. This work provides a new idea for future design of space optical communication terminal.

（Original research article "Optik Vol. 189, pp. 130-147 (2019) https://linkinghub.elsevier.com/retrieve/pii/S0030402619307314 "）