大型射电望远镜主动反射面控制

摘要

针对13.7m毫米波望远镜的特点提出一种新型主动反射面的控制方法,消除重力、温度、湿度和风力等对主反射面的影响,从而提高大型射电望远镜的分辨率、灵敏度和观测效率,设计了一种CAN/ethernet协议转换器,实现CAN中大量位移促动器与其在工业以太网中的主机的通信,通过光电编码器的反馈闭环控制位移促动器的驱动电机,大大提高了反射面的控制精度.%Due to gravity,temperature,humidity,wind loading,etc,there are errors between the actual surface and the ideal surface of a radio telescope antenna when it is at work.To compensate for these errors and improve the global performance of a large radio telescope such as Delingha 13.7 m millimeter-wave telescope,a novel active surface control method was proposed to increase its resolution,sensitivity and observation efficiency at high frequencies according to the changes of its antenna situation in the observation process.A controller area network/ethernet protocol converter was designed for the communication between the active surface control computer as a host computer in ethernet and the displacement actuator controller in controller area network.The closed-loop control of the displacement actuator driven by a stepper motor and controlled by an intelligent controller improves the control accuracy greatly through the feedback link based on the optical encoder.