Analysis of the The Second-order Nonlinear Discrete-time Tracking-differentiator as a Filtering

摘要

A new second-order nonlinear discrete-time tracking.difierentiator is presented.and it'S filtering ability is studied.Under the condition of some parameters proper choice of the tracking-differentiator,some approximated linear second.order discrete.time tracking-differentiator is obtained.To some input signaI time series containing some noise,by the measure of front filter and reverse filter so as to cancel phase delay,a general solution of the filter problem containing front edge effect and rear edge effect is obtained.To this tracking.difierentiator,there exist a filtering factor,proper adjastment this parameter can effectively increase its ability of removing noise.Finally some numerical simulations result are given.as a resuit the feasibility of the tracking.difierentiator’s filtering method is confirmed.