A method for generating a signal including a temporal succession of modulated chirps. The modulation corresponds to a circular permutation of the variation pattern of the instantaneous frequency of a base chirp over the symbol time Ts, obtained by a time shift of s times an elementary time period Te, such that M*Tc=Ts. Such a method includes, to generate a given chirp in the temporal succession of chirps, differential encoding between a modulation symbol associated with a chirp preceding the given chirp in the temporal succession of chirps, on the one hand, and a given information symbol of the constellation of M symbols, on the other hand, the differential encoding delivering a given modulation symbol; and modulating the base chirp on the basis of the given modulation symbol generating the given chirp.