Parametric Sparse Representation Based Technique For 2-D SAR Autofocusing

Aiming at the azimuth defocusing problem of SAR image caused by the unstable velocity of the platform, an autofocusing method based on parametric orthogonal matching pursuit (P-OMP) algorithm is proposed in this paper. Firstly, the SAR echo data is processed by range dimension pulse compression and migration correction. Then the range-cell of the strong scattering point is selected according to the energy distribution. Based on P-OMP algorithm, the optimal focusing factor is estimated from the selected range-cell data. With the estimated focusing factor, a well-focused image can be obtained. Experimental results shown the effectiveness of the proposed method.