Moving Target Detection and Imaging Using a Single-Channel SAR

A single-channel SAR algorithm, which detects moving targets, finds their velocity vectors, and forms their focused images is proposed. To find both the range and cross- range velocities, a circular data collection path is considered, thus providing the flexibility to control the azimuthal angle vs. slow time variation over the synthetic aperture. The back- projection approach is adapted for the task of accurate imaging of moving targets. A highly efficient back-projection algorithm is developed using multilevel interpolation and aggregation of coarse images based on partial data sets.