I have a set of measurement data of a FMCW radar and trying to estimate the system transfer function. In the frequency spectrum, I can see multiple peaks due to the non-linearity that exist in the system. I want to estimate the transfer function for each peak.
What I did: I designed filters to cut out each peak and using deconvolution I've estimated the transfer function. In the verification step somehow this process has failed to replicate the system exactly.
What I wanted to do: I want to directly cut out frequency peaks using window function instead of filters. But I am not able to understand how to place the window around frequency peaks so that I can extract each peak separately.