Frequency Response Estimator - how is the frequency response computed

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jacob
jacob 2025-6-20
评论： jacob 2025-6-20
Using sinestream mode, the FRE block in simulink generates complex numbers for the frd data block that estimate the frequency response. Accuracy improves with more estimation periods. I need to know how FRE works under the hood so that I can justify choices for number of estimation periods for a given test frequency during the experiment. I have reasons to believe that during online estimation the FRE block is implementing some sort of synchronous demodulation. I cannot find information on how the FRE block actually computes frequency response anywhere online.

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Andrew Ouellette
Andrew Ouellette 2025-6-20
Hi @jacob,
You can see a description of the FRE algorithms on its documenation page.
Generally, using more estimation periods results in a better estimate (as noise is averaged out), but requires a longer simulation time.
If you want more information, you can look under the block mask (select block -> Ctrl+U) and see the implementation yourself.

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