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A Comparison of ARMA and Unit Pulse Response Identification of Step Response Models

This paper compares the identification of step response model coefficients based on either an autoregressive moving average (ARMA) model or a unit pulse response model. The identification of the two model types is compared for speed and accuracy in achieving the ideal step response coefficients in open-loop and closed-loop single-input, single-output systems. This comparison is useful for those wishing to construct an adaptive form of those model-based predictive controllers that use an internal step response process model.