I did some measurements, and I have two received signals in two different distances.
By doing the fft on the signals, I have the spectrum, then by using the angle() function in MATLAB on my fft, I computed the phase for each frequency.
I understand that the angle() function just give me the angle of each point of fft. I'm confused, is this the phase of my signal? Is this the phase relative to what signal?
As far as I know, phase of a signal, a Line-of-sight signal, after traveling a distance of L is computed as this:
c: is the speed of light.
The number that the
angle(fft()) gives me is very different. Not even close to the above formula.
And I did all of this in MATLAB.