Research On Auto-Coupling PID Control Method Of Precision Terminal Guidance System

The missiles-target motion system is a kind of nonlinear,large disturbance and large time-varying complex system,and the design of its guidance law is extremely challenging.Aiming at the challenging problems of rapidity,accuracy,and anti-disturbance that urgently need to be solved in maneuvering target interception systems,two types of precise terminal guidance control methods based on Auto-coupling PID stabilization rules are proposed.The main research content of this paper is to study two types of terminal guidance systems according to the Auto-coupling PID tuning rules and two types of guidance schemes.The main research content is as follows:1)The characteristics of the two-dimensional projectile relative motion system in the terminal guidance stage are analyzed in detail,especially when the relative distance of the missiles and target is close to zero,the line-of-sight angular rate and its angular acceleration rate both approach infinity.The existing guidance methods for guidance purposes have limitations such as long interception time,low interception accuracy,complex guidance systems,and poor robustness of guidance law parameters.Aiming at this limitation,a new method using the product of the missile-target distance and the LOS angular rate as the target for guidance is proposed.;2)In view of the limitations of the existing guidance methods,a research on the Auto-coupling PI terminal guidance method based on the tracking method is proposed,which mainly includes the study of the Auto-coupling PI terminal guidance law of the missile lead angle tracking the sight angle of the missile,and the analysis of the Auto-coupling PI terminal guidance method.The robust stability and anti-disturbance robustness of the terminal guidance system are verified by simulation experiments to verify the effectiveness of the Auto-coupling PI terminal guidance method based on the tracking method.The simulation results show that the Auto-coupling PI terminal guidance law based on the tracking method not only has high interception accuracy,simple structure,and is convenient for practical application,but also has a large margin for the initial lead angle of the missile,which can be applied to various interception scenarios.However,the Auto-coupling PI terminal guidance law based on the tracking method is a strong tracking strike method,which requires the missile speed to be greater than the target movement speed to achieve a successful strike;3)Aiming at the above two main contents,the research method of the Auto-coupling PI terminal guidance system based on the parallel approach method is further proposed,which mainly includes the study of the Auto-coupling PI terminal guidance law with the normal velocity of the missiles-target approaching zero,and the analysis of the Auto-coupling PI terminal guidance law.The robust stability and anti-disturbance robustness of the guidance system are verified by simulation experiments to verify the effectiveness of the Auto-coupling PI terminal guidance method based on the parallel approach method.The simulation results show that the Auto-coupling PI terminal guidance law based on the parallel approach method not only has high interception accuracy,simple structure of the guidance law,and is convenient for practical application,but also has a large margin in the initial lead angle of the missile,which can be applied to various interceptions scenes.Compared with the Auto-coupling PI terminal guidance method based on the tracking method,the Auto-coupling PI terminal guidance method based on the parallel approach method has a shorter interception time,does not require the missile speed to be greater than the target movement speed,and has greater application value.The main features and innovations of this paper:1)The guidance system of the two Auto-coupling PI terminal guidance methods has a simple structure and is convenient for practical application;2)These two Auto-coupling PI terminal guidance methods have short interception time,high interception accuracy,and the guidance system has good robust stability and anti-disturbance robustness.