Dual-channel SAR ground moving target detection and parameters estimation

This paper proposes a new algorithm for imaging moving targets via estimating their motion parameters with dual channel synthetic aperture radar. Displaced phase center array (DPCA) antennas are used for clutter cancelation through which moving targets are detected. The range motion of a moving target induces a Doppler centroid shift and additional range walk, while the along-track motion changes the Doppler modulation rate. The Doppler centroid shift dislocates the moving target from its actual azimuth position, and the additional range walk deteriorates the imaging resolution. The slope angle of the range walk trajectory is estimated via Hough transform, then the range velocity can be obtained. Doppler parameters of the moving targets are estimated with the fractional Fourier transform (FrFT). In this way, both target range and azimuth velocities are acquired. Next, the moving targets are focused with one uniform imaging algorithm. Simulated data processing results are provided to demonstrate the effectiveness of the proposed algorithm.