| The active reflector of Five-hundred-meter Aperture Spherical Telescope is composed by more than2,400cable nodes. In order to complete the observation missions successful, the2,400nodes need the function of real-time dynamic positioning control. So, the active reflec-tor control system needs for the cable node dynamic real-time controlling, accurate control-ling and precision controlling. Precision controlling of them uses gear box in mechanical con-trol to achieve. Dynamic real-time controlling and accurate controlling use intelligent node controllers to achieve. Network architecture, system reliability, stability and accuracy of the active reflector control system are the keys for radio telescope to complete its targets.The active reflector control system is mainly composed of three parts:the overall control system, communication network and node controllers. The overall control system developed a set of software to control all of node controllers in personal computer. Communication net-work selected Ethernet which have highly reliability and real-time as the networking way of reflector control system. Node controlles is not only a network communication terminal but also direct executor of the active reflector control system. So node controller becomes the key of the system. In this thesis, it descirbes the whole process of development of FAST radio telescope Ethernet node controller based on embedded technology. According to the charac-teristics of the active reflector control system, node controller should have the Ethernet com-munication module, high-speed work rate and real-time reliable operation, strong computing power and remote update function. The design of node controller was divided into two parts:hardware design and controller programming. In aspect of hardware circuitry, it has achieved Ethernet interface module, motor control circuits, motor monitoring circuit and clock chip circuit design.170sets of PCB board have been produced, which have been tested and ac-cepted. In aspect of control programming, it has completed the design of the various program modules based on μC/OS-II, including Ethernet communication, time information read and write programs, remote updates and automatic measurement mode procedures and so on. Based on Miyun50-meters model, the ability of communication and control have been de-bugged on131nodes and the perfection and optimization of the control procedure have been finished as well.Ethernet node controller in Miyun model runed and be tested, and it has meet the re-quirements of the active control system. |
