A Novel ST-DFnT based Parameter Estimation for LFM Signals

Because of the important role that linear frequency modulation (LFM) signals play in new radar systems, the problem of LFM detection and parameter estimation have received more attention from researchers recently. In this paper, a new parameter estimation method of LFM signal is proposed. Firstly, the Scaled Transform Discrete Fresnel Transform (ST-DFnT) is constructed, which is composed of a group of orthogonal chirp bases with variable chirp rate. Then, based on this transform, the estimation of LFM signal frequency modulation slope, initial frequency and amplitude are realized. Simulation results illustrate the superiority of the proposed method in computational complexity.