(January 16, 2016 at 7:17 pm)Alex K Wrote: Why do you get beats? Don't you get the same frequency back with a constant phase shift?
the phase shift is dependent on the time the wave travels in the plasma until it gets to the reflecting layer... along the way, it meets layers which have a non-zero index of refraction which must be accounted for... and these are not always in the same position... or else, why have such a diagnostic at all?