The Adjustment System Of A65Meter Radio Telescope’s Sub-reflector: The Network Client’s Activex Development And Joystic Controlling Strategy Research

In order to meet the requirements of lunar exploration and the exploration of theuniverse, the Shanghai Observatory will construct a65meters radio telescope. The subreflector needs to be adjusted according to the telescope’s work situation and the actuallocation of the deviation to be compensated. Therefore we developed a sub reflectoradjustment mechanism which was based on Stewart parallel mechanism, making subreflector able to move to the specified location. Because the sub reflector system need tobe remote controlled by the master system, we need to design a set of remote control linksystem, so that the antenna main control software can communicate with the sub reflectorsoftware and transmitting data. At the same time inconvenience of actual operation systemwas found in subsurface debugging process, putting forward the concept of joystickcontrol. A new manipulation method for future sub reflector manipulation was proposedby the algorithm, along with prototype production successfully verifying the feasibility ofthe joystick control.This paper mainly introduces is that on the platform of Windows, the ActiveX which isbased on VC, designing a network client control for the sub reflector adjustment system. Itmakes the antenna control software is able to remote control and monitoring the subreflector. The communication protocol of controls and the function of each module andimplementation method is introduced in detail.Concept of vice reflective surface based on the joystick control is presented. Putforward the principle of dynamic tracing and give the calculation formula. Through thesoftware in the industrial control PC makes the dynamic tracing instantiation.Designs and manufactures the rocker arm controller, writing lower computer programof rocker controller. The rocker arm controller and the upper machine can communicatethrough serial communication.Two experiments were completed. The first experiment tested each function ofnetwork client depend on the sub reflector system. Through a series of control experiments,relevant data been recorded, so as to verify the feasibility of the design; the second experiment verified by simulation the feasibility of the dynamic tracking algorithmthrough the designed joystick control system. Then combination of6PUS parallel robotfor joystick control system was tested.