Simulink Control Design™ - MathWorks

For more information, see the data port description on the Frequency Response

Estimator block reference page or “Collect Frequency Response Experiment Data for

Offline Estimation” on page 6-23.

freqs — Frequencies for offline estimation

vector

Frequencies for offline estimation, specified as a vector of positive values. When you

collect response data using the Frequency Response Estimator block, you specify the

frequencies for the estimation experiment using the Frequencies parameter of the block.

Use the same vector of frequencies for freqs when you perform offline estimation with

the logged data.

units — Units

"rad/s" | "Hz" | 'rad/s' | 'Hz'

Units of frequencies for offline estimation, specified as one of the strings "rad/s" or

"Hz" or one of the character vectors 'rad/s' or 'Hz'. When you collect response data

using the Frequency Response Estimator block, you specify the units of the frequencies

for the estimation experiment using the frequency units block parameter. Specify the

same units when you perform offline estimation with the logged data.

Output Arguments

sysest — Estimated frequency response

frd model

Estimated frequency response, returned as a frequency-response (frd) model object. The

frd model has as many inputs and outputs as are specified in the linearization analysis

points io.

The frequencies in sysest depend on what input signal you use for estimation, as

follows:

• If you use a sinestream signal created with frest.Sinestream, the frequencies in
  sysest are the frequencies specified in the sinestream signal.


• If you use any other input signal, the frequencies are determined by the FFT
  computation that the function performs to extract the frequency response (see
  “Algorithms” on page 15-105).

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