What is the difference between FRD and IDFRD

1- What is the difference between FRD and IDFRD?

2- Why FRD objects can not be directly used in simulink mdoels? (Why need to convert them to LTI objects via tfest so they can be used in Simulink models?)


Matlabsolutions.com provide latest MatLab Homework Help,MatLab Assignment Help for students, engineers and researchers in Multiple Branches like ECE, EEE, CSE, Mechanical, Civil with 100% output.Matlab Code for B.E, B.Tech,M.E,M.Tech, Ph.D. Scholars with 100% privacy guaranteed. Get MATLAB projects with source code for your learning and research.

Both FRD and IDFRD are used to store Freqyency Response Data, that is, the complex frequency response vector (Mag.*exp(i*Phase)) measured over a given frequency grid. FRD belongs to Control System Toolbox. It has properties like ResponseData, and Frequency to store information on the frequency response.

IDFRD belongs to System Identification Toolbox. It extends FRD of Control System Toolbox to store additional information that is relevant for identification such as response covariance and spectrum information.

  • Either FRD or IDFRD can be used data source for identification of parametric models (transfer functions, state-space etc). For example, sys = tfest(FRD, n) creates an n-pole transfer function that fitsthe frequency response in FRD over its frequency range.
  • IDFRD can be an output of a non-paramteric estimation too. For example, the command SPA performs spectral analysis on a given time-domain data (that is, input and output signals) and returns the results as an IDFRD object. It




Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store
Technical Source

Technical Source

Simple! That is me, a simple person. I am passionate about knowledge and reading. That’s why I have decided to write and share a bit of my life and thoughts to.