A novel single frequency along-track interferometry for ground moving target imaging

This paper presents a theory for combining the Doppler-SAR imaging modality with the along-track interferometry (ATI) technique. Doppler-SAR forms high resolution reflectivity images by backprojecting to iso-Doppler contours instead of the iso-range contours used in conventional SAR. A novel forward model is derived for Doppler-SAR imaging of moving targets, and the phase difference between two antennas flying in tandem is shown to be an additional Doppler phase shift. Numerical simulations are then performed to demonstrate the theory.