I have a question. Why a chirp signal has the Fresnel ripples in slobes? I thought it has the equal amount of frequencies from lowerband to high band, so we should see the flat magnitude. Is that related to the chirp signal is the finite in time? I heard the complex chirp has the flat magnitude but what's the complex chirp?
I tried to reproduce a complex sinusod with the modulated frequency but anyway it has the ripples.