System identification in a networked environment using second order statistical properties

Authors:
Yasir Irshad;Magnus Mossberg;Torsten SöDerströM
Affiliations:
Department of Physics and Electrical Engineering, Karlstad University, SE-65188 Karlstad, Sweden;Department of Physics and Electrical Engineering, Karlstad University, SE-65188 Karlstad, Sweden;Division of Systems and Control, Department of Information Technology, Uppsala University, PO Box 337, SE-75105 Uppsala, Sweden
Venue:
Automatica (Journal of IFAC)
Year:
2013

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Abstract

System identification for networked control is considered. Due to the time-delays in the network, it can be difficult to work with a discrete-time model and a continuous-time model is therefore chosen. A covariance function based method that relies on the second order statistical properties of the output signal, where it is assumed that the input signal samples are from a discrete-time white noise sequence, is proposed for estimating the parameters. The method is easy to use since the actual time instants when new input signal levels are applied at the actuator do not have to be known. An analysis of the networked system and the effects of the time-delays is made, and the results of the analysis motivate and support the chosen approach. Numerical studies indicate that the method is robust to randomly distributed time-delays, packet drop-outs, and additive measurement noise.