Research on Sliding-Mode Variable-Structure Guidance Law with Impact Angle Constraint

In order to get the best damage effect of the warhead, anti-tank missiles (ATM) not only depend on the precision (with miss distance as zero), but also on the angle of fall. Based on simplified missile target relative motion model, an improved adaptive sliding-mode variable structure guidance law is designed, which meets the double requirements of miss distance as zero and angle of fall. Meanwhile, the chattering phenomenon of variable structure is weakened by the combination use of hyperbolic tangent function method and variable switching coefficient method. The simulation results show that the designed guidance law has high accuracy and robustness at the time of attacking different range target.