# Non-Linear, Non-Stationary spectral analysis methods! When and where?

I have been reading about non-linear non-stationary signal analysis methods and it seems to do this type of analysis the go-to method is the Empirical Mode Decomposition (EMD), then Hilbert Transform (HT) to get instantaneous phase and frequency.

However I have been doing some analysis on a non-linear, non-stationary signal by splitting the time signal into intervals with a Hanning window and Fourier transforming each interval which I think might also be the idea behind the Short Time Fourier Transform (STFT), although I am not sure.

Can anyone tell me what is wrong with this method, and why the EMD / HT method is more advantageous? I have also seen wavelet analysis used in similar cases, is this something I should look into?

• Don't know about non-linear as a generic problem but my old "hobby horse" is Wavelets for what this problem sounds like. – rrogers Jul 30 '19 at 20:31