Questions about finding triggering frequencies

[brendabrandy]

I was reading a paper about side channel attacks (http://s3.eurecom.fr/docs/ccs18_camurati.pdf) and it referenced your github page (https://github.com/bolek42/rsa-sdr). I am not very familiar with wavelets, so I have a few questions about how you find the triggering frequency:

1. Why do you use multi-pulse response instead of the spectrogram to find the trigger signal? The spectrogram and multi-pulse response graph look very similar to one another, so couldn't I just use the spectrogram?

2. How do you perform the pulse search? I looked at the pulse_search function of your source code, but I'm still confused about the process. Can you give me a high level overview of what you're doing in that function?

3. Why do you use the Haar Wavelet transform and not other wavelet transforms? What advantage does Haar Wavelet transform have that is beneficial to the current task?