Design And Simulation Of Small Low-altitude Defense Missile Guidance System

With the rapid development of drone technology,low-altitude defense is increasingly being valued by various countries in the face of threats from illegal drone flight incidents.Low-altitude defense missiles are an important means of low-altitude defense,and its guidance system is the key to precision strikes.For low-altitude flying targets,it has the characteristics of small size,strong maneuverability,and slow speed,which brings challenges to the guidance of low-altitude defense missiles.In this regard,this article focuses on the design and research of a small low-altitude defense missile guidance system based on the "low,small,slow" characteristics of low-altitude flying targets.The main work of the paper is as follows:(1)Explains the main work flow of the low-altitude defense missile guidance system,and mainly explains its terminal guidance method.According to its guidance requirements,the missile’s own information acquisition problem in the guidance process is studied,and the characteristics of Euler angle method,directional cosine method and quaternion method are compared.According to the guidance requirements of low-altitude defense missiles,Kalman filtering is proposed.The quaternion attitude calculation algorithm.Tests to verify its feasibility in the process of low-altitude defense missile guidance.(2)The relative motion model of the missile and the target was established,and three classical guidance law methods(tracking method,parallel approach method and proportional guidance method)were compared and combined with modern control theory.A method of variable structure guidance law based on robust and stable is proposed,and the feasibility of this method is verified by comparing the target with or without maneuvering in the simulation experiment,and it can meet the robustness requirements in the process of low-altitude defense missile guidance.(3)The target information acquisition model in the process of low-altitude defense missile guidance is proposed.It mainly analyzes the infrared images collected in the missile guidance process in real time.Through image processing operations such as noise removal,image enhancement,and image segmentation on the collected infrared images of the target,the target It is extracted from the background to realize target recognition.Finally,the position information of the target relative to the missile is calculated by the position of the recognized target on the infrared image,and the target recognition and tracking in the missile guidance process are realized.