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In the paper,two nonlinear parameter estimation methods based on chaotic theory,surrogate data method and Lyapunov exponents,are used to distinguish the difference of non-stationary signals.After brief introducting of the corresponding algorithms,two typical different non-stationary signals with different nonlinear constraining boundaries are taken to be compared by using the above two methods respectively.The obtained results demonstrate that the apparently similar signals are distinguished effectively in a quantitative way by applying above nonlinear chaotic analyses.
In the paper, two nonlinear parameter estimation methods based on chaotic theory, surrogate data method and Lyapunov exponents, are used to distinguish the difference of non-stationary signals. After brief introducting of the corresponding algorithms, two typical different non-stationary signals with different The obtained results demonstrate that the apparently similar signals are distinguished effectively in a quantitative way by applying over nonlinear chaotic analyzes.