Design And Implementation Of Servo System For Satellite Communication In Motion

Communication on the move(COTM)system is widely used in military and civilian fields,such as targets searching,air defense,ground communication,etc.The properties of servo controller affect the performance of mobile communications system.It consists of mechanical turntable,motor and driver,position and speed sensors,inertial navigation equipment,feed source and receivers,control and computation processor and data communication devices.The software of such system is composed by the upper computer software and the lower computer software.In this thesis,DSP core and Elmo motor drive are first used to construct the software and hardware of COTM system.Second,active disturbance rejection control(ADRC)strategy is introduced for the servo control system.Two kinds of controller are designed in the position loop,LADRC and NLADRC.The former one is easier to realize and the later has better performance.The disturbance rejection ability is improved using ESO to estimate and compensate the disturbance.The feasibility has also been verified by simulation and the parameters of controller are given explicitly.Finally,the designed controller is successfully applied to the practical servo platform.The main implement method of servo-related parts is shown in detail.Experiments are performed on the platform and the performance of servo system is analyzed on according to the experimental data.This thesis elaborates the application of ADRC algorithm on antenna servo system,from both design and implementation aspects.The advantage of ADRC algorithm is testified by the experimental results and performance indicators.With the designed controller,the control-related performance of system has been greatly improved.