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Estimation of parameters in nonlinear systems using balanced synchronization.

Henry D I Abarbanel1, Daniel R Creveling, James M Jeanne

  • 1Department of Physics and Marine Physical Laboratory ,Scripps Institution of Oceanography, University of California, San Diego, La Jolla, California 92093-0402, USA. habarbanel@ucsd.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 21, 2008
PubMed
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This study introduces two novel methods for improving model parameter estimation using data synchronization. These techniques balance synchronization accuracy with the ability to reliably determine model parameters, even with noisy data.

Area of Science:

  • Complex Systems
  • Nonlinear Dynamics
  • Data Assimilation

Background:

  • Model parameter estimation often relies on synchronization between observed data and model simulations.
  • Strong coupling can lead to a minimized cost function but hinders accurate parameter determination.
  • Existing methods struggle to balance synchronization quality with parameter identifiability.

Purpose of the Study:

  • To develop and evaluate new methods for balanced synchronization in model parameter estimation.
  • To address the challenge of achieving both accurate synchronization and reliable parameter selection.
  • To investigate the effectiveness of these methods in systems exhibiting deterministic chaos.

Main Methods:

  • Introduced a 'balanced' synchronization method incorporating conditional Lyapunov exponents.

Related Experiment Videos

  • Developed a time-varying coupling method based on synchronization error.
  • Explored systems with deterministic chaos, including those with noisy data signals.
  • Main Results:

    • The proposed methods effectively balance synchronization cost and parameter determination accuracy.
    • The time-varying coupling method demonstrates generalized synchronization in well-determined parameter regions.
    • Successful parameter estimation was achieved even in the presence of noise.

    Conclusions:

    • The novel balanced synchronization techniques enhance the reliability of parameter estimation from observational data.
    • These methods offer a robust approach for model completion in complex dynamical systems.
    • The findings are applicable to systems with deterministic chaos and noisy data.