pwelch ignores peaks in PSD plot

1 vue (au cours des 30 derniers jours)
Pietro Campolucci
Pietro Campolucci le 5 Mar 2021
Commenté : Mathieu NOE le 8 Mar 2021
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?
  8 commentaires
Pietro Campolucci
Pietro Campolucci le 5 Mar 2021
I am sorry but I am not allowed as it is forbidden unfortunately. However increasing the window size slightly seemed to have a positive effect on the peak detection. However if I increase more the smoothed function gets noisier. I guess that is the best it gets.
Mathieu NOE
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;

Connectez-vous pour commenter.

Réponses (0)

Catégories

En savoir plus sur Parametric Spectral Estimation dans Help Center et File Exchange

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by