Transfer function fitting from ASCII-data file

2015 3 10
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更新时间：2015 3 11
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I use a network analyser to observe an electrical system. The network analyser provides an (ASCII-)table with the frequency as function of the power ratio and the phase difference. Now I would like to know if there is a function in Matlab to fit these data to obtain a transfer function of such electrical system.
Could someone help me with this?
thank you!

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Sebastian Castro
Sebastian Castro 2015-3-11

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If you have System Identification Toolbox, you can package up the frequency + complex response data in an idfrd container. The complex response can be found from the magnitude and phase.
After you have your data, you can estimate a transfer function with the tfest function in this toolbox.
- Sebastian

更多回答（2 个）

dpb
dpb 2015-3-10

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The Signal Processing Toolbox contains the function tfestimate and related friends...
Bjorn
Bjorn 2015-3-11

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Dear dpb,
The problem is that I cannot use the function tfestimate, because my data consists of the frequency associated with the transferred power (output/input) [dB] and phase difference (output-input) [deg].
I cannot find any function which transforms this data into a transfer function.
Did someone something similar like this before?

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