Three-dimensional guidance law to control impact time and impact angle:a two-stage control approach

The control law for the impact time and the impact angle is applied to carry out a saturation attack for anti-ship missiles against close-in weapon system(CIWS).The 3-D missile control for the impact time and the impact angle consists of two stages.In the first stage,the missile kinetics is decoupled approximately into yaw channel and pitch channel.In the yaw channel,the impact time control problem is transformed into a range-to-go tracking problem,and then,the desired slow subsystem and the fast one are designed by using the time-scale separation method.Considering coarse control to azimuth,we separately design the inverse dynamic controllers for the above two subsystems,and derive the yaw control command.In the pitch channel,only a coarse control of the elevation angle is considered,the impact angle control is ignored.In the second stage,we derive the 3-D guidance law with impact angle constraints for the coupled system using Lyapunov stability theory.Simulation results validate the proposed approach.