Design And Study On Servo Controller For Satellite Data Transmission Antenna Pointing Mechanism

The servo controller for antenna pointing mechanism is installed in the body of the satellite, it’s main task is to drive and track the Ka 、 X antenna pointing mechanism, for two‐axis motion, to achieve beam pointing, and to accomplish the task of the satellite’s data transmission.This thesis is based on demonstrating and researching the general scheme of a servo controller for two axis pointing mechanism in accordance with the needs of the satellite antenna.It introduces a design scheme, which is based on an antifuse structure FPGA as the main controller, a resolver as the angular position sensor, to control the stepper motor which is installed in the pointing mechanism.Firstly, uniform constant amplitude rotating current vector subdivision is adopted in the design through analyzing characteristics of the stepping motor. The drive system uses the resolver to form a real‐time position closed loop control system in order to improve the system accuracy.Secondly, according to the idea of satellite overall modular and integrated electronic design, the product is transformed from the traditional stand‐alone form to the modular one. The system adopts the irradiation FPGA device, H‐bridge driver chip selects aerospace‐on‐chip,which can solve the space application and heat dissipation problem and can be suitable for high‐orbit satellite agencies control.Thirdly, the product is used VHSIC hardware description language(VHDL) to write motor control system program,adopting modular design, and through top‐level design,sub‐module design、division and layout, comprehensive and simulation, which can realize the communication with the central computer, and control the pointing mechanism.Finally, an experimental platform of the servo controller is built to verify the pointing performances. The test results show that the drive system possesses high precision and reliability, which can be suitable for high‐orbit satellite agencies control under complicated. It provides a new integrated、reliable solution for the servo controller.