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How to compute the Instantaneous Power Spectrum ???

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Paul Fishback
Paul Fishback on 19 Aug 2014
Edited: Star Strider on 19 Aug 2014
I'm looking for a means of computing the instantaneous power spectrum (IPS) of a signal, as described in the master's thesis of K.A. Hagerman ( http://www.ntis.gov/search/product.aspx?ABBR=ADA257504 ). For the signal, s(t), the ISP is the derivative of the running energy spectrum:
rho(t,w)=d/dt S_t(w)^2, where
S_t(w)=Integral of s(tau)*exp(-i*w*tau) from tau=-infinity to tau=t.

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