I know adding zeros will not increase the frequency resolution. I have couple of waveforms in time domain measured over months. I take the fft of the waveforms to find frequency components. The problem is I get several points around each peak, but only based on visual check i found that the real peak is not the one hit by discrete frequency points.
To shovel this, 1. I can add zeros to get finer structure so that the frequency points are more close to the real peak points.
My question is: I can perform the same procedure for all waveforms. But can I really compare the peaks identified with such zero padding so that I can get the conclusion about whether there is peak shift over time or not in terms of frequency.