I am trying to combine two sets of data together, each of them having different sampling rates. For example if I sampled a 100 Hz sin wave at 1KSPS, and another 150Hz sin wave at 1.5KSPS, would it be possible to combine them for FFT without using non-uniform FFT techniques? Or would my best case be interpolating the slower one so that they match in sampling rate? Or would it be valid to superposition the result of FFT of the 2 signals for magnitude and phase plots?
(for combining, I mean that I want to do FFT on both signals together such that I see both signals in terms of magnitude and phase plots)