The Strawman PSD is an example of PSD enveloping. The PSD envelope is set high enough that the largest magnitude of the PSD across any frequency range is contained under this envelope. As a result of the enveloping the PSD is conservative and typically defined with only a few points.
Let the Strawman PSD structure be as follows
>> StrawmanPSD.mag = [1E6, 1E6, 1E-2]; >> StrawmanPSD.freq = [1E-3, 1, 1E4];
- the mag field is the PSD magnitude in and
- the freq field is the PSD frequencies in Hz.