how to find phase angle for the FFT data of a transient signal ?

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Mahesh
Mahesh 2012-8-6
currently i am using PSD to calculate my fft
[y(:,1),f] = pwelch(z1(:,1),hann(fsize),round(fsize/2),fsize,fs);% calculate PSD
yfft(:,1)=sqrt(1.5*y(:,1));% calculate fft

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Honglei Chen
Honglei Chen 2012-8-6
Why not just use fft? PSD contains only the power information so the phase information is lost.
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Honglei Chen
Honglei Chen 2012-8-6
编辑：Honglei Chen 2012-8-6
What is your expected result and what is the result you get from FFT? Like I mentioned, you cannot expect to get phase from PSD since there is no phase information in it.
John Petersen
John Petersen 2012-8-6
You may need to apply a window on the data to reduce the effects of nonzero starting and ending points of the data set.

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