The digital design of servo loop controller

To solve the disadvantages of the analog circuit in the servo control system,such as device drift,pour anti-interference ability,difficult to monitor variables and etc,we analysed the servo loop analog controller of a shipboard satellite communication station and proposed the method that replacing analog control with computer control.We used the zero-order holder to digitalize the analog controller,and proposed a control algorithm that can be achieved with computer easily.Through simulation with Matlab,we proved that digital controller can completely replace the analog controller,which improved the antenna system stability and reliability.