Abstract
The relative motion parameters between moving target and radar flight platform are unknown, resulting in the azimuth shift and defocus of the target in the synthetic aperture radar (SAR) image. Limited by the pulse repetition frequency (PRF), the target is prone to Doppler centre ambiguity at high velocity, which makes refocusing the target difficult. This paper proposes a fastmoving ground target focusing and motion parameters estimation method for SAR. Firstly, second-order keystone transform (SOKT) is adopted to remove the target's range curvature migration (RCM). Then, range-frequency domain correlation (RFDC) and scale Fourier transform are performed for the target focusing and cross-track velocity estimation. The time-reversal process (TRP) and two-dimensional scale Fourier transform (2D-SCFT) are performed for the target focusing and along-track velocity estimation. Simulation experiments show that the method can estimate the unambiguous cross-track velocity and along-track velocity of the target separately without searching parameters. Meanwhile, it can be applied to multi-target scenes.
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