Description of the Power Spectral Density

A Power Spectral Density (PSD) is the measure of signal's power content versus frequency.  A PSD is typically used to characterize broadband random signals. The amplitude of the PSD is normalized by the spectral resolution employed to digitize the signal.

The original data are labeled h(t) as a function of time t. In the frequency domain, the PSD is labeled P(f) as a function of frequency f.

The Power Spectral Density normalizes the level with respect to the frequency resolution. This overcomes differences that may arise from using a specific Bandwidth. This is the standard way of measuring stationary broadband signals:

Note

Simcenter Amesim propose to use correction factor to compensate the use of windowing. For a PSD, the correction factor in Energy is used.