Research on Multi-Mode Control Strategy for Spaceborne Antenna Pointing Mechanism

Abstract

The key problem of the spaceborne antenna pointing mechanism is to achieve high static pointing accuracy and realize fast dynamic tracking within the pointing range. In order to improve the static pointing and dynamic tracking accuracy, this paper utilizes a single-position closed-loop control algorithm to control the spaceborne antenna pointing mechanism, which works in the preset mode and tracking mode, meanwhile introduces feedforward control strategy. Finally, based on Matlab/Simulink, the simulation platform of the pointing control system is built to verify the control performance of the algorithm. The simulation results show that the steady-state error can reach 10-4° when kp=0.03, and the tracking accuracy can reach 10-4° after stabilization. This algorithm can satisfy the requirement of control error which should be less than 0.02°. Furthermore it can shorten the adjusting time with feedforward control strategy.