A correction algorithm of migration through Doppler resolution cell for bistatic inverse synthetic aperture radar

When the size of a target or the rotation angle is large, migration through resolution cell may occur in the bistatic inverse synthetic aperture radar (Bi-ISAR) which will affect the imaging quality. A correction algorithm based on the minimum criterion of image entropy is proposed in this paper. The rotating center is estimated according to this criterion. Then the phase compensation term is constructed and the correction of migration through Doppler resolution cell is finished. Finally, simulations are carried out which compare the quality of images based on the maximum criterion of image contrast and the minimum criterion of image entropy. The results show that the proposed method can correct the migration through Doppler resolution cell and improve the imaging quality.