Using synchronization of chaos to identify the dynamics of unknown systems

Using synchronization of chaos to identify the dynamics of unknown systems

Francesco Sorrentino, Edward Ott Institute for Research in Electronics and Applied Physics, Department of Physics, and Department of Electrical and Computer Engineering, University of Maryland, College Park, Maryland 20742
Università degli Studi di Napoli Parthenope, 80143 Napoli, Italy
Abstract

We address the issue of how to identify the equations of a largely unknown chaotic system from knowledge of its state evolution. The technique can be applied to the estimation of parameters that drift slowly with time. To accomplish this, we propose an adaptive strategy that aims at synchronizing the unknown real system with another system whose parameters are adaptively evolved to converge on those of the real one. Our proposed strategy is tested to identify the equations of the Lorenz, and the Rössler systems. We also consider the effects of measurement noise and of deviation of our fitting model from consistency with the true dynamics.

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