Proposing an effective discrete-time ADRC (active disturbance rejection control) variable structure terminal guidance law

In order to intercept high maneuvering target, we propose a discrete-time ADRC variable structure terminal guidance Law, which we believe is effective. First, Tracking-Differentiator (TD) filter has good filtering property; the differential angle of sight with noise pollution can be filtered by using TD filter. Secondly, it can predict the target real acceleration from the extended state observer (ESO) in real time. Finally, we propose a reaching-law discrete-time variable structure terminal guidance law by using the power function. Power function algorithm can effectively eliminate high-frequency chattering in switch function of discrete-time sliding mode control system. We present the simulation of maneuvering target; the simulation results and their analysis show preliminarily that this law has strong robustness and high guidance precision.