Control System For Ship-borne Optoelectronic Platform Based On Variable Structure Control Strategy

Ship-borne optoelectronic stabilizing Platform is one of the key parts of the ship-borne weapon system, the quality of its specifications will directly relate to the accuracy and reliability of the weapon system. It has an important significance in the national defense construction. This paper aims at series of ship-borne optoelectronic stabilized platform and makes a thorough study on steady servo control technique.By analysis of optoelectronic stabilizing system, an entire inertial platform servo loop's mathematics model was built. By analysis of conventional single closed loop control strategy and simulation, we could see that this controller has a good dynamic performance, but its ability of anti-interference is low. In order to overcome the interference and improve the stabilizing accuracy, a double-loop control method of speed negative feedback is presented in this paper. The speed-loop contains the interference. From the results of the simulation, the double loop control is enabled to achieve anti-interference aim.Conventional controller can not effectively overcome system model parameter change and the influence of uncertainty. In order to improve stabilizing accuracy further more, sliding mode variable structure control was adopted. Sliding mode variable structure control be designed by exponential velocity trending law and studied on the application of sliding mode control in stability system. In order to eliminate the chatter in sliding variable structure control, a new concept of boundary layer is introduced, and obtained a good control result, which based on exponential velocity trending law.Meanwhile, the software and hardware for this control system was designed. In the hardware design of this system, microcontroller TMS320LF2407A is applied as CPU, and introduced the exterior hardware circuit and the working theory. At last, we discussed how to solve the software and give the flow chart.