ORBIT – operating-regime-based modeling and identification toolkit

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ORBIT is a MATLAB-based toolkit for black-box and grey-box modeling of non-linear dynamic systems. The model representation is based on multiple local models valid in different operating regimes, that are smoothly blended into a global non-linear model. ORBIT is a computer-aided modeling environment that supports the interactive development of regime-based models on the basis of a mixture of empirical data and prior knowledge (similar to Takagi–Sugeno-type fuzzy models). ORBIT contains functions for robust parameter identification, including constrained identification, regularization and Bayesian identification. There are functions for structure identification, including selection of the local model orders as well as decompositions into operating regimes that give a good fit to the data. Model validation, simulation, visualization and automatic code generation are also supported.