Abstract
The tracking range and pointing performance of the antenna are important indices to measure the antenna system. First, the 3 degree of freedom parallel mechanism is proposed for the supporting mechanism of the antenna. The trajectory tracking principle of the antenna mechanism is analyzed based on the inverse position solution model. Meanwhile, the kinematic model of the antenna mechanism with a specific motion trajectory is derived. In addition, the structural optimization design is demonstrated based on the actuation torques and motion range index. In addition, the trajectory planning research is carried out according to the trajectory tracking requirements. The trajectory planning simulation is carried out in the joint space. Afterward, the antenna motion range is obtained through simulation. The specific trajectory tracking simulation of the antenna is completed. Furthermore, the pitch and azimuth motion performance experiments are carried out based on the developed antenna mechanism prototype. Finally, the pentagram trajectory tracking performance is verified via experiments. This research serves as a reference for designing and engineering application of the antenna.
Highlights
Antennas are widely used in signal communication and military investigation
The 3-degree of freedom (DOF) parallel mechanism is proposed as the antenna mechanism
The trajectory tracking principle of the parallel antenna mechanism is deduced based on the inverse position model
Summary
Antennas are widely used in signal communication and military investigation. The antenna mechanism is the carrier of stable and reliable operation of the antenna system. Altuzarra et al. designed a parallel pointing mechanism for solar tracking. Abid et al. studied the stiffness performance of a new 2-DOF fast pointing static mechanism. Guo et al. proposed a new modular truss deployable antenna mechanism and carried out the combination method and performance analysis. Feng and Liu proposed a design method of the deployable antenna reflector based on graph theory. Song et al. studied the synthesis of the parallel antenna mechanism based on the displacement subgroup and displacement manifold and proposed two new parallel antenna mechanisms with two rotational DOFs. Han et al. investigated the configuration synthesis of a ring truss deployable mechanism for space antennas based on screw theory. It is an important research topic in the antenna field to design an antenna mechanism with a wide tracking range and good pointing performance.
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