Model-order reduction based on Prony´s method

A new model-order reduction technique for linear dynamic systems is presented The idea behind this technique is to transform the dynamic system function from the s-domain into the z-domain via the bilinear transformation, then use Prony´s least- squares approximation method instead of the commonly employed Pade approximation method, and finally transform the reduced system back into the s-domain using the inverse bilinear transformation. Simulation results for large practical systems show that this technique based on Prony´s method gives much higher accuracy than the traditional Pade method, and results in lower-order approximations without significant increase in simulation time.