Moving target imaging via the high squint SAR

In high squint mode, the difficulty of the SAR imaging is how to remove the coupling between the range parameter and azimuth parameter in the received signal. The Keystone Transform (KT) is well suitable for the removal of the moving target range walk. With a short synthetic aperture, the SAR receiver only obtains several sample data in the slow-time domain, which results in the poor azimuth resolution. The rank-deficient Capon algorithm defined as azimuth resolution by an efficient non-diagonal loading spectral estimation method is improved in this paper. The simulation proved that the method can effectively solve the conflicts of the range walk and improve the azimuth resolution.