Parameter estimation of multicomponent SFM signals based on discrete sinusoidal frequency modulation transform

Abstract

As a non-stationary signal,the sinusoidal frequency modulation(SFM) signal is widely used in radar and wireless communication fields.To solve the problem that common time-frequency analysis methods can not estimate the parameter of multicomponent SFM signals effectively,the discrete sinusoidal frequency modulation transform(DSFMT) is proposed.According to the characteristic that the SFM signal is energy-concentrated in the DSFMT domain,the parameter estimation method of multicomponent SFM signals by DSFMT is presented.The models of multicomponent SFM signals are described;the different concentration properties of multicomponent SFM signals in the DSFMT domain are demonstrated;the performance of the mentioned method is analyzed by simulation.Theoretical analysis and simulation results show that there are apparently differences between two SFM signals in the DSFMT domain,the proposed method can precisely estimate the amplitudes and modulation indices of multicomponent SFM signals.