I have a touch signal on a plate recorded with 3 accelerometers with a sample rate of 150kHz over a duration of 5 seconds (so 750k samples). The goal is to localize the position of the touch in the end. But for that, I need to separate the reflections from the direct wave. And therefore need to do some signal analysis. I have read some papers about structural health monitoring using where they analyze the data using Wigner-Ville distribution (WVD). I wanted to try that as well but I struggle to get it to work in either Matlab or Python, where I get a memory error since the data is so large (and the function depends on a double fft). I have tried to look at the interesting part of the signal, but even that can be up to 2 seconds which also gives the same error. Is it so that WVD only works on small samples of data? Also, are there other methods that I should try for signal analysis? I have tried spectrogram which works nicely. And scaleograms which worked ok-ish.
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1An improvement over WVD is synchrosqueezing. Small comparison here. – OverLordGoldDragon Mar 13 '23 at 17:28
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3I'd recommend looking at @OverLordGoldDragon's suggestion. The WVD is a dead-end for most applications. Looks pretty, but ... has problems. If you want a C implementation of the WVD, this C code does it. – Peter K. Mar 13 '23 at 18:11