Frequency response describes the steady-state response of a system to sinusoidal inputs. Simulink Control Design™ lets you estimate the frequency response of a system modeled in Simulink (offline estimation). You can perform offline estimation using Linear Analysis Tool or at the command line.
Online estimation lets you deploy an embedded estimation algorithm as a standalone application for real-time estimation of a physical plant.
The result of frequency response estimation is a frequency response model, stored
frd model object. You can use this model for tasks such
as linear analysis, controller design, or identification of a parametric model. For
more information about the types of frequency response estimation and available
tools, see Frequency Response Estimation Basics.