A novel moving parameter estimation approach offast moving targets based on phase extraction

A novel approach for imaging fast ground moving targets with fast cross and along track velocities is presented in this paper, in which their moving parameters are estimated by using single-antenna synthetic aperture radar (SAR). First, the way of phase extraction is proposed. Next, fractional Fourier transform is applied to estimate the Doppler parameters for the extracted phase. According to the parameters, a matched filter is generated to correct simultaneously range walk and curvature. Finally, after azimuth compression, a focused image is obtained. By considering the general definition of the Doppler modulation rate and obtaining the shortest distance from the focused image, the estimation of fast along track velocity is precise. Simulation results validate the performance of the proposed approach.