The Study Of Control System In Antenna Near-field Measurement

The near-field measurement has been widely used as a highly precise antenna measurement technique. Because the near-field measurement can get the information of a large and precise antenna quickly and truly, it has been favoured by antenna designer.A control system of antenna near-field measurement based on the Anechoic chambers has been studied in this paper. The design of this control system's interface and a half-closed loop control based on PMAC have been discussed. This paper divide the whole system into the interface system and the position control system.The interface of control system has been designed with Delphi. The layout of this interface has separate sections, this kind of design make the system displayed intuitional, easy to control and has a good fault tolerance. The program use the structure of main menu-submenu mode, so each menu can be called step by step, it also can make the system process many missions at a time.With the PMAC card, we design the program of the position control, and achieve the multi-axis linkage of the positioner, probe and rotary table working. By using the half-closed loop, we can ensure the high precision and stability of this control system. Finally, a study of the process of position control is launched.