Abstract
Moving targets are usually defocused in synthetic aperture radar (SAR) images due to across range unit (ARU) range migration and Doppler migration caused by unknown motion parameters. To eliminate the influence of these issues on moving target imaging, a novel Doppler parameters estimation method for moving targets is proposed. First, second-order keystone transform (SOKT) is applied to remove range curvature. Then, a deramp function is proposed to reduce the order of coupling and remove the residual first-order coupling. In the following, Doppler parameters can be obtained through range IFFT and azimuth FFT. The proposed method is capable of accumulating the energy of ARU target's trajectory into a peak and obtaining Doppler parameters in range-Doppler domain with low computational complexity. Furthermore, it has better antinoise performance comparing with the Hough transform and Radon transform. The effectiveness of the proposed method is validated by simulated data for ground moving targets.
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