I obtained actual data from a researcher, consisting of a matrix composed of several received signals from an up-ramp fm-cw radar.
Wouldn't be reasonable to plot the spectrogram of a ramp up and obtain a chirp like this ? (This is from MATLAB spectrogram examples)
Instead what I get is this (I know the plots are rotated):
I have read that the received signal if you send a triangular wave, should be a the same but delayed and shifted in frequency.
What do you think?