Research On Cooperative Detection And Guidance Methods For Multiple Flight Vehicles

With the development of today’s aerospace technology,the emergence of precision-guided weapons from various countries constantly threatens national security,so the continuous improvement of defense systems is imperative.The interception targets of the defensive system are not limited to stationary or low-speed targets.In recent years,various challenges such as high-speed maneuvering,maneuvering escape,supersonic speed,and near space have come one after another.Therefore,the requirements of target detection estimation,aircraft control and guidance methods have also risen.A single interceptor has limited target interception performance and the direction of multiple interceptors’ cooperative interception has emerged.As a result,the problem of maximizing the use of resources between multiple aircrafts and the optimal effect has been considered,resulting in multi-aircraft collaboration.Research topics include detection,multi-sensor information fusion,aircraft formation control,coordinated guidance and interception of targets.This article takes the multi-aircraft cooperative interception of air maneuvering targets as the background,To solve the problem of where to fly,this paper researched from how a single aircraft obtains the target motion information to how multiple aircrafts’ information is fused together;To solve the problem of stable flight,this paper researched form how to control a single aircraft to stably fly and respond quickly to a given command to achieve the desired formation of multiple aircrafts through formation control;To solve the problem of accuracy,we finally researched how to coordinate multiple aircrafts to the target location to implement precise strikes.The specific research content of the paper is as follows:Firstly,the coordinate system describing the movement of the aircraft and the target and the transformation relationship between the different coordinate systems are introduced.The dynamic model,kinematic model and attitude control model of a single aircraft,and the geometric relationship model of multiple aircrafts are constructed.By designing a single aircraft to backstep the overload tracking controller for the limited time in the pitch / yaw channel and the limited time to backstep the rollover controller for the roll channel to ensure that a single aircraft responds quickly to the overload command and stabilizes the flight,Then provides a solid technical foundation for multiple aircraft formation and multi-aircraft coordinated guidance.Thirdly,based on the above-mentioned formation flight design,the back-step control law for formation control by measuring inter-ballistic information and the consistency formationcontrol law for formation through mutual communication between aircrafts are based on the innovation of limited time convergence.The designed control law is compared with the traditional progressive convergence formation control law to verify the control effect of finite time convergence formation.Finally,Focus on the multi-aircraft cooperatively intercepts the terminal guidance process.In order to achieve the volley attack on the same target by multiple aircrafts in the last short time,a finite-time convergence theory is proposed.Based on this,a “leader-follow”strategy is used to design a limited time-convergence three-dimensional space guidance law,Then,the theory of lateral,normal and line-of-sight directions from a three-dimensional coupled guidance model prove that the line-of-sight angular rate can still converge to zero in finite time.The simulation results show that the guidance performance of FTCG is more robust.