Missle Guidance System Design Based On Active Disturbance Rejection Control Algorithm

Missiles are crucial weapon in modern war, and its guidance law design has become animportant study subject in weapon research for the biggest military powers in the world. Inmodern warfare, because of complex operational environment, air target maneuveringperformance is increasing; large airspace and high mobility flying, and other factors, there aremore stringent requirements for modern guidance law design. In this paper, missile guidancelaw is designed based on active disturbance rejection algorithm, and furthermore, simulationanalysis and verification are processed in order to prove the robustness and the ability to resistdisturbance. Main research is listed as follows:First, the paper describes the principle of active disturbance rejection technology and thegeneral laws of parameter tuning. The necessary coordination systems are defined and thetransformation relations among them are given. The integrated nonlinear missile model isgiven under the analysis of force and moment that bearing in missile，based on the motionrelationship of missile and target, three-dimensional pursuit model is derived.Secondly, based on active disturbance rejection technology and missile-target model,take advantage of these characteristics of active disturbance rejection control, such asindependent of accurate control mathematical model, excellent ability to resist disturbanceand high control accuracy, and combine active disturbance rejection technology and nonlinearPID in this paper，design a guidance system controller, and gives a complete discretecontroller solution. The guidance system includes vertical channel and lateral channel. Thetwo channels are interdependence and coordinate with each other. The guidance system doesnot rely on accurate mathematical model of the controlled object. It uses extended stateobserver observe the unknown disturbance and real-time compensate, achieving a dynamicfeedback linearization. Finally, for the designed guidance system, simulation analysis aredone, in which disturbance is added, and target is stationary and snake-like mobile. Thenguidance system is compared with traditional proportional guidance method. The results showthat the guidance system designed can tracking instructions quickly and accurately, cope withmoving targets better, and suppress the unknown disturbance on the system performancebetter, the design of the guidance system is more robust.In summary, this study provides a useful reference for the application of active disturbance rejection theory in the field of guidance.