Thread Subject: Converting from FRD to TF?

Is it possible to convert from an FRD to a TF using the MATLAB Control
Systems toolbox?

My professor and I are attempting to model the step response of a
circuit using both a transfer function calculated from engineering
principles and an FRD acquired from experimental data, however the
step function does not support FRDs. Is there any way around this?

Converting FRD into TF is an exercise in frequency domain identification.
Try using System Identification Toolbox. The FRD object would be your data
that you can pass to estimators such as pem or n4sid to create a parametric
model represented by a model object.

Rajiv

"The Fulgh" <mfulghum@gmail.com> wrote in message
news:f8dd7e2d-3173-4346-886b-99a13377299f@v15g2000prn.googlegroups.com...
> Is it possible to convert from an FRD to a TF using the MATLAB Control
> Systems toolbox?
>
> My professor and I are attempting to model the step response of a
> circuit using both a transfer function calculated from engineering
> principles and an FRD acquired from experimental data, however the
> step function does not support FRDs. Is there any way around this?