Complete synchronization, phase synchronization and parameters estimation in a realistic chaotic system

The two-parameter phase space in certain nonlinear system is investigated and the chaotic region of parameters are measured to show its chaotic properties. Within the chaotic parameter region, the complete synchronization, phase synchronization and parameters estimation are discussed in detail by using adaptive synchronization scheme and Lyapunov stability theory. Two changeable gain coefficients are introduced into the controllable positive Lyapunov function and thus the parameter observers. It is found that complete synchronization or phase synchronization occurs with different controllers being used though the parameter observers are the same. Phase synchronization is observed when zero eigenvalue of Jacobi matrix, which is composed of the errors of corresponding variables in the drive and driven chaotic systems. The optimized selection of controllers can induce transition of phase synchronization and complete synchronization.

Research highlights
► Transition from complete to phase synchronization is induced by different adaptive controllers.
► A statistical function is used to detect the optimized gain coefficients in the controllers.
► Phase synchronization is measured by zero eigenvalue from Jacobi matrix and stability theory.
► Parameter uncertain and mismatch are solved optimized adaptive control scheme.