Study on fine tracking control system for space optical communication based on feed-forward compensation

Aiming at the problem of nonlinearity and time delay in fine tracking system for space optical communication,which makes it difficult to set up a precise mathematical model,a set of fuzzy PID control system based on feed-forward compensation is designed,and a fine tracking control platform is developed by means of adopting openable windows CMOS camera with camera-link interface and large scale FPGA chip.The function modules such as image processing,feed-forward compensation and fuzzy PID algorithms are all integrated into FPGA chip,which greatly reduce equipment′s bulk and cost.Fuzzy PID integrated with feed-forward compensation improves the control precision and enhances the anti-jitter ability of nonlinear system largely.Indoor test demonstrates that this system has the characteristics of high stability precision,powerful anti-jitter ability and better practical value.