Study On Nonlinear Three-dimensional Variable Structure Robust Adaptive Guidance Law

Three-dimensional relative motion model of missile and target is established in three dimensional spherical coordinates,the maneuvering acceleration of target is regarded as a disturbance with boundary,3-D variable structure robust guidance law for homing missile based on zeroing normal speed of LOS(line-of-sight) is presented in intercepting the high maneuverable target,and the adaptive parameters of system are designed by using of Lyapunov method.Numerical simulation shows that the rates of LOS approach zero.The simulation result verifies the correctness and effectiveness of the presented guidance law.