Multiple-frequency interferometric velocity SAR location and imaging of elevated moving target

Locations of moving targets in synthetic aperture radar (SAR) images are determined not only by their geometric locations but also by their velocities that cause their SAR images defocused, smeared, and mis-located. With a linear antenna array, velocity synthetic aperture radar (VSAR) can detect, focus, and locate slowly moving targets well. However, it may mis-locate fast moving targets in the azimuth (cross-range) direction, and sometimes even in the ground range direction if the targets are elevated above the ground. In this paper, we propose an antenna array approach with cross-track interferometry, in which multiple wavelength signals are transmitted. It is shown that our proposed multiple-frequency interferometric velocity SAR (MFIn-VSAR) can locate both slowly and fast moving elevated targets correctly.