Design of Motion Controller for Satellite-Borne Data Transmission Antenna

Abstract

In order to realize stable, reliable, and high-precision motion control of the satellite-borne data transmission antenna, a FPGA-based motion controller is designed and achieved. The controller receives commands through the RS-422 asynchronous transmission serial port and performs speed planning autonomously. The controller also performs closed-loop position control with the collected resolver angle and controls two antennas synchronously or independently in a subdivision driving method. The controller is firstly designed using the hardware description language VHDL, simulated in ModelSim software. Then, it is connected to the stepping motors through the LMD18200H bridge chip by using aerospace-grade FPGA, controlling the data transmission antennas to regulate the angle, go to zero-position, or stop rotation. The simulation and experiment results show that the design can control the antennas accurately and stably. The accuracy of angle regulation reaches 0.0085° under the condition of 64 subdivisions and 100 : 1 reduction ratio.