Design of the robust guidance law with terminal angle constraint

According to the requirements of some types of missiles which attack target with specified angle at the terminal point, a guidance law with angular constraint is designed. System perturbation and target acceleration are regarded as an exogenous disturbance, then the guidance law which meets the performance of 1-2 gain is achieved by Lyapunov method. Simulation results show that both the precision and impact angle are met well even when target maneuvers with a large acceleration. And the guidance law has no use for any target information and shows a good robustness.