Departamento de Engenharia Elétrica da Escola de Engenharia de São Carlos, Universidade de São Paulo 13566-590, São Carlos, SP, Brazil
Academic Editor: Elbert E. Neher Macau
Copyright © 2009 Elmer P. T. Cari et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
A combination of trajectory sensitivity method and master-slave synchronization was proposed
to parameter estimation of nonlinear systems. It was shown that master-slave coupling increases the robustness
of the trajectory sensitivity algorithm with respect to the initial guess of parameters. Since synchronization is
not a guarantee that the estimation process converges to the correct parameters, a conditional test that guarantees
that the new combined methodology estimates the true values of parameters was proposed. This conditional test was
successfully applied to Lorenz's and Chua's systems, and the proposed parameter estimation algorithm has shown to be very robust with respect to parameter initial guesses and measurement noise for these examples.