Identification of linear dynamic systems using piecewise constant excitations: use, misuse and alternatives

摘要: Abstract Time domain identification of linear dynamic systems using discrete time models relies heavily on the use piecewise constant excitation signals (ZOH-assumption). If this assumption is not met, severe errors can be generated and results useless. In article we study implications ZOH-assumption an alternative formulated. This leads to frequency methods based band limited (that obey Shannon sampling theory). The theory practical aspects both approaches are compared. Finally, it will shown that periodic excitations (or perturbation signals) offer significant advantages in approaches.