Buffetless discrete variable structure guidance law for UAV based on disturbance compensation

In a complex electromagnetic environment, the effectiveness of the traditional analog guidance law algorithm is not perfect because the target's coordinate measured by the rear early-warning aircraft contains errors and there exists the maneuvering of targets. Besides, the analog guidance law can not also apply digital signals come from the data link directly. Having the properties of anti-interference, variable structure control can be used to solve the measured error of the coordinate and the maneuvering of targets. But the traditional discrete variable structure algorithm has the defect of buffeting when getting into the sliding mode, which is harmful to the motor. In order to further improve the guided precision, a buffetless discrete variable structure guidance law based on disturbance compensation is proposed. Simulation results show that the proposed discrete signal guidance law can meet the tactical requirements for UAV.