New method for THz SAR moving target imaging based on keystone formatting

Because of the complexity of its movement, ground moving targets have certain difficulties in using SAR imaging methods for their focused imaging. THz has large bandwidth and high imaging resolution, and the imaging shift and blur caused by the movement of targets are also more serious than normal. In this paper, an imaging method based on keystone formatting is presented for general ground moving targets. Firstly, the paper analyzes the influence of the movement of targets on SAR imaging, and then proposes a keystone formatting algorithm based on sinc interpolation value to eliminate the effects of linear range migration. Finally, the method and necessity of eliminating the quadratic range migration errors are disscussed. The availability of the method mentioned above has been proved by simulation.