Research On Terminal Guidance Law Of High-speed Air-to-ground Missile With Falling Angle/The Seeker's Field Of View Constraint

In the modern warfare,air-to-surface missiles play an important role in the precise strike of various strategic and tactical targets,close fire support and regional suppression.Conventional air-to-ground missiles can strike the target accurately,but may not cause fatal damage to the target.Therefore,in the process of carrying out the strike mission,it is often necessary to not only require the air-to-ground missile to accurately strike the target,but also damage the target seriously.So the missile is required to complete the ground strike mission with a certain falling angle.In the process of striking the target at a certain falling angle,the trajectory is relatively curved.In order to ensure that the target is within the field of view of the seeker at the end of the terminal guidance stage,it is necessary to design guidance law of the falling angle/the seeker's field of view constraint.And through the digital simulation to complete the effectiveness analysis of its guidance law,and comparative analysis of the advantages and disadvantages of each guidance law.Firstly,the systematic research on the falling angle/the seeker's field of view constraint at home and abroad,and the detailed analysis of the research status,summarize the research background and the research significance of the terminal guidance law with the falling angle/the seeker's field of view constraint.Secondly,studying the problem of air-to-ground missiles modeling,defines common coordinate systems,gives Euler angles and transformation matrices between coordinate systems,and gives kinematics and dynamics models of missile flight processes.The relative motion relationship is established to establish a relative motion model of the projectile.Then,by studying the sliding mode variable structure theory,the adaptive sliding mode terminal guidance law with falling angle constraint is designed for the terminal falling angle constraint problem and its stability is proved.The effectiveness of the guidance law is analyzed by simulation.Aiming at the problem of slow convergence of adaptive sliding mode approaching line angle,the non-singular terminal sliding mode terminal guidance law with falling angle constraint is designed and its stability is proved.The effectiveness of the guidance law is analyzed by simulation.In three-dimensional space,the two kinds of sliding mode guidance laws are adopted,and the validity of the guidance law is verified by simulation analysis.Based on the sliding mode terminal guidance law with the falling angle constraint,combined with the idea of logic switching,the study of the terminal guidance law with the falling angle/the seeker's field of view constraint is completed,and the simulation is carried out.Finally,Because the overload in the logic switching process isn't continuous,considering the minimum energy consumption of the actuator in the final guidance process,based on the optimal control theory,deriving the optimal guidance law with the falling angle/the seeker's field of view constraint,and verifying the validity of the guidance law.For the practical engineering problem,the analytical expression of the tracking error angle of the seeker when using a single trajectory shape guidance law is derived.The guidance method of the falling angle constraint and the seeker's field of view angle constraint based on the trajectory shape guidance law is given and simulated.