A new method for estimating the Doppler and multipath time delay of the overlapping echoes for LFM pulse radar by only one period pulse signal is presented.First

the Doppler frequency is estimated by Wigner-Hough transform.Then

a reference signal is reconstructed using the prior knowledge of the transmitted signal and the frequency parameters.Finally

using the property that Wigner-Ville distribution can separate each echo from overlapping echoes in time-frequency plane

the multipath time delay is obtained by a so-called "the modified time-frequency correlation function" proposed in this paper.The proposed method is characterized by the stronger robustness of additive Gaussian noise and the lower computational cost.