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So I have an experimental data; A is a chirp signal (sweep sine wave) and B is the response of the system. I identify the system as follows in MATLAB:

figure
Ts= 1e-4;
Fs = 1/Ts;
[T,f]=tfestimate(A,B,[],[],[],Fs);
semilogx(f,20*log10(abs(T)));
grid

But when I change Ts to different values (e.g. 1e-2), the plot changes. For instance This is with Ts = 1e-2

This is with Ts = 1e-2

This is with Ts = 1e-4

This is with Ts = 1e-4

Can anyone help me figure out what the correct value of Ts is, so my reported eigenfrequencies are correct?

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  • $\begingroup$ why not use the actual sample rate? $\endgroup$ – Stanley Pawlukiewicz Dec 27 '18 at 19:16
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    $\begingroup$ Please also respond to the comments on the same question you posted on Reddit instead of reposting the question at multiple places. $\endgroup$ – fibonatic Dec 27 '18 at 23:06
  • $\begingroup$ what is your B ? $\endgroup$ – Ahmad Bazzi Dec 28 '18 at 13:07

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