Research On Cooperative Mission Planning And Guidance Methods For Multi-Aircraft

With the increasing improvement of air defense and anti-missile systems in various countries,the combat effectiveness and survivability of single aircraft are greatly threatened.Multi-aircraft cooperative combat can significantly improve the penetration and strike capability of aircraft,and it will become an important combat style in the future battlefield.In this paper,the key technologies such as cooperative trajectory planning,cooperative operation target allocation and cooperative guidance are studied under the background of multi-aircraft cooperative operation.Firstly,aiming at the problem of the lack of research on cooperative trajectory optimization design of multiple aircrafts in reentry phase,this paper proposes two time and angle cooperative flight strategies of multiple aircrafts.Firstly,the three degree of freedom kinematics model of the reentry phase of the aircraft under multiple constraints is established.Secondly,the flight angle coordination is realized by tracking the virtual target points.Then,the time coordination flight strategies based on the desired flight time and the extended state variables are designed respectively.Finally,the model is solved by hp-adaptive Radau pseudo-spectral method.Secondly,considering the guidance capability of aircraft in the reentry phase,a time cooperative reentry trajectory planning method for multiple aircrafts is proposed based on the bank angle-energy profile.Firstly,the constraints in the reentry flight process of aircraft are transformed into the profile corridor of bank angle-energy,and the bank angle is designed as a quadratic polynomial about energy determined by two control parameters.Secondly,the time-to-go interval for each aircraft to meet the range constraints is obtained by adjusting the two control parameters,and the cooperative flight time is determined.Finally,in the longitudinal direction,the predicted range-to-go and time-to-go are ensured to be the same as the actual by online correction of the two control parameters,and in the transverse direction,the heading angle error corridor control is adopted to ensure that the aircraft can accurately reach the specified target position,so as to finally realize the cooperative flight of multiple aircraft.Thirdly,aiming at the problem of how to allocate weapons targets to maximize combat effectiveness,this paper proposes a target allocation method based on improved sparrow search algorithm.Firstly,according to the leading angle of the missile,the relative distance between the missile and the target and the missile velocity,a comprehensive efficiency function reflecting the operational efficiency is proposed,and a multi-aircraft target allocation model under constraints is established.Then,based on the target allocation model,the traditional sparrow search algorithm is improved to improve its search accuracy and robustness.Finally,the improved sparrow search algorithm is applied to solve the target allocation model.Fourthly,aiming at the problem of multi-aircraft time cooperative attack,a multimissile time cooperative guidance law with finite time convergence without specifying the desired impact time in advance under undirected communication topology is proposed in this paper.Firstly,the multi-aircraft time cooperative guidance problem is transformed into a second-order consistent time control model.Then,a finite time convergent secondorder consistent control algorithm is designed and proved.Based on this algorithm,a finite time convergent multi-missile time cooperative guidance law is designed.Finally,the results of target assignment in chapter 4,sudden changes in combat tasks and missile velocity under time-varying are simulated and verified.