Three-dimensional variable structure guidance law for homing missile with terminal angle constraints

Using the virtual displacement of missile in short time, established a 3-dimensional variable structure guidance (VSG) logic with terminal angle constraints for un-powered homing missile. Then contrasted the trajectories, control angles and loads of the missile with VSG and PNG (proportional navigation guidance) command order, and the simulation results showed that the designed guidance logic not only could make sure the missile impact the target in specified direction precisely, but also make sure the final control angles close to zero. So the designed guidance law adapted to the homing missile to attack ground target precisely with terminal angle constraints.