Frequency Domain System Identification Toolbox for Matlab

Tools for frequency domain model identification and validation


·         Design of optimized periodic excitation signals (multisine, binary, three-level)

·         Identification of continuous-time or discrete-time systems with unknown fractional delay

·         Model order selection

·         Model validation, including simulation, calculation of residuals, and test of cost functions

·         Calculation of confidence intervals of amplitude/phase and poles/zeros

·         Model conversion to and from the Control System Toolbox and System Identification Toolbox objects


The Frequency Domain System Identification Toolbox (FDIDENT) provides specialized tools for identifying linear dynamic single-input/single-output (SISO) systems from time responses or measurements of the system's frequency response. Frequency domain methods support continuous-time modeling, which can be a powerful and highly accurate complement to the more commonly used discrete-time methods. The methods in the toolbox can be applied to problems such as the modeling of electronic, mechanical, and acoustical systems.
The Frequency Domain System Identification Toolbox is built entirely in MATLAB and all functions are available from the MATLAB command line or through an interactive interface.

FREE DOWNLOAD for non-profit use

Requesting download of a free-of-charge one-week TRIAL version

Frequency Domain System Identification Toolbox_image                                        
Identify the behavior of a robot arm
with an estimate for 4 zeros and 6 poles.

The current version of the Toolbox is Version 5, December 19, 2023, tested for MATLAB 2023b.

Backward compatibility is maintained also with MATLAB 9.x, 8.x, 7.x, 6.x, and 5.3: R11.
Subscribers will receive a new passcode from the distributor when they upgrade their MATLAB. If you download a subscriber version, and have received no new passcode yet, please email us.

Related links and actions:

General Information     Data Sheet of the Toolbox    HTML document about the GUI    
Novelties in Version 4.0   
The MathWorks Third Party Products FDIDENT Page

Frequently Asked Questions   Usage and Examples

Papers on the Toolbox
Book on frequency domain system identification
Book of problems in frequency domain system identification
Book on industrial process identification applying the Fdident Toolbox  

Terms of Use     Referring to the Toolbox    

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Requesting download of a free-of-charge one-week trial version


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These pages were last edited: January 1, 2024.