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I have a noisy(blue) and clean(red) signal. I have windowed them by a hanging window and used Matlab pspectrum() to plot their power spectrum.

I see a periodic peak at noisy(blue) one which is spaced around 1.8Hz. How should I interpret this periodic peaks? Signal is sampled at 130Hz.

enter image description here

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    $\begingroup$ The most likely explanation is that your noise is periodic with 1.8Hz and that the peaks are the Fourier Series of that periodic noise signal. Similar to power supply noise which is periodic with 60Hz in the US and with 50Hz in Europe $\endgroup$
    – Hilmar
    Mar 19 at 19:19

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