Transfer function estimation with unknown number of poles and zeros

Question

Claudio 2014-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/127090-transfer-function-estimation-with-unknown-number-of-poles-and-zeros

回答： Arkadiy Turevskiy 2014-4-25

采纳的回答： Arkadiy Turevskiy

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I have an input and output signal registered in time-domain (discrete).

With

sys = tfest(data,np,Ts);

I can estimate the transfer function given the number of poles. But I don't know how many poles/zeros my transfer function should have to best fit the data.

Is there a way that MATLAB can estimate the best transfer function without these constraints?

Thank you very much.

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Answer 1

Arkadiy Turevskiy 2014-4-25

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https://ww2.mathworks.cn/matlabcentral/answers/127090-transfer-function-estimation-with-unknown-number-of-poles-and-zeros#answer_134629

No, when using tfest you have to specify the number of poles and zeros.

If you are estimating state-space models, you can make use of the tool that helps you pick the order. See this example . You can then export identified state space model to MATLAB workspace and convert to a transfer function.