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Topic: Why does Bode Plot frequency axis change with sampling time?
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Paul C

Posts: 5
Registered: 2/27/07
Why does Bode Plot frequency axis change with sampling time?
Posted: Apr 19, 2014 7:23 PM
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Why does the Bode Plot frequency axis change if the sampling time 'dt' is changed?
If dt is changed from 1e-3 to 1e-4, the axis labels go from 10^1 --> 10^4, to 10^2 --> 10^5. But sampling time shouldn't change the axis, just the accuracy.
dt = 1e-4;
t = (0 : dt : 50)';
uc = chirp(t, 0.1, t(end), 100);
yc = circshift(uc, 100); %phase shift the output
data = iddata(yc, uc, dt);
TF= etfe( data );
bode(TF);



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