The Brewster Angle Guidance Law Considering Missile’s Dynamics of Autopilot

When the radar seeker is detecting super-low altitude targets, it is affected by multi-path effects, which greatly reduces the tracking accuracy. When the line-of-sight angle is restricted near the Brewster angle, it can diminish the effects of multipath interference, and improve the tracking accuracy. an guidance law considering missile's dynamics of the autopilot is designed to track expected Brewster angle using the extended state observer and dynamic surface control methods; To take account of the influence on the guidance accuracy of target's maneuver, the target's maneuver are estimated by the extended state observer for further implementation. To avoid the “explosion of terms” and the singularity problem, the nonsingular terminal sliding mode and dynamic surface control schemes are proposed for the guidance law design. And the results show that the proposed guidance law can ensure the interceptor track and attack super-low altitude target with intended Brewster angle, deaden the multipath interference to a minimum extent and; enhance the interception's accuracy.