SAR imaging of moving targets

A method of forming synthetic aperture radar (SAR) images of moving targets without using any specific knowledge of the target,motion is presented. Th e new method uses a unique processing kernel that involves a one-dimensiona l interpolation of the deramped phase history which we call keystone format ting. This preprocessing simultaneously eliminates the effects of linear ra nge migration for all moving targets regardless of their unknown velocity. Step two of the moving target imaging technique involves a two-dimensional focusing of the movers to remove residual quadratic range migration errors. The third and last step removes cubic and higher order defocusing terms. T his imaging technique is demonstrated using SAR data collected as part of D ARPA's Moving Target Exploitation (MTE) program.