Online Frequency Response Estimation
R2026bSimulink® Control Design™ lets you measure the frequency response of your system in operation. The block performs an experiment that injects signals into the plant and measures the plant output. If you have a code-generation product such as Simulink Coder™, you can generate code that implements the estimation algorithm on hardware. Deploying the algorithm to hardware lets you measure the frequency response of a physical plant in real time. To get started, see Online Frequency Response Estimation Basics.
Blocks
 | Frequency Response Estimator | Estimate plant frequency responses during simulation or in real time |
 | Start-Stop Generator | Generate start-stop signal used by signal generation, estimation, and autotuning blocks (Since R2024a) |
Topics
- Online Frequency Response Estimation Basics
The Frequency Response Estimator block lets you measure the frequency response of a system in operation.
- Online Estimation Using Plant Modeled in Simulink
Use the Frequency Response Estimator block to estimate the frequency response of a plant modeled in Simulink while the model is running.
- Deploy Frequency Response Estimation Algorithm for Real-Time Use
Deploy online frequency response estimation as a standalone application for real-time tuning against your physical system.
Featured Examples
Online Frequency Response Estimation During Simulation
Perform online frequency response estimation during model simulation using the Frequency Response Estimator block.
Online Estimation of Frequency Responses of a Nonlinear Plant
Use the Frequency Response Estimator block to perform online estimation of a nonlinear plant at different nominal operating points.
Collect Frequency Response Experiment Data for Offline Estimation
Use the Frequency Response Estimator block to perform a frequency response estimation experiment and store the data for later estimation offline.
Online Frequency Response Estimation Using PRBS Input Signals
Use the Frequency Response Estimator block to perform online and offline estimation using PRBS input signals.
Identify Frequency Domain Features Using Frequency Response Estimator Block
Identify frequency domain features of interest using the PRBS input signals.
Frequency Response Estimation of PMSM Using Field-Oriented Control
Performs frequency response estimation (FRE) of a plant model running a three-phase permanent magnet synchronous motor (PMSM). When you simulate or run the model on the target hardware, the model runs tests to estimate the frequency response as seen by each PI controller (also known as raw FRE data) and plots the FRE data to provide a graphical representation of the plant model dynamics.
