pwelch ignores peaks in PSD plot
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Hello there. I am studying the PSD plots of various aircraft states, and overlapping different estimation methods (green is analytical, blue is FFT and red is pwelch). As you can see, at 0.03 for the PSD of pitch angle there is a peak of power, which is indicated in the analytical plot but is also visible in the FFT plot. I am now trying to smooth out the FFT with the pwelch method, but does not matter how hard I try, the smoothed function will not detect the peak there.
My question is therefore: is this behavior expected, or there is something that I am not seeing that will allow the pwelch smoothed function to represent the peak as well?
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Mathieu NOE
le 8 Mar 2021
yeap - maximizing the window size gives you the best frequency resolution, hence you are more able to see a peak emerging. So window size = data length in that case;
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