A frequency response identification method for discrete-time processes with cyclic steady state conditions

A new frequency response identification method is presented to estimate frequency responses of discrete-time linear time-invariant processes. It provides multiple exact frequency response data set for any desired frequencies. The proposed method is applicable to all the process data types of both initial/final steady state, initial steady state/final cyclic steady state, initial cyclic steady state/final steady state and both initial/final cyclic steady state. Also, it completely removes the effect of static disturbances and shows acceptable robustness to measurement noises.