Range-Doppler Based Moving Target Image Trace Analysis Method in Circular SAR

The single channel Circular Synthetic Aperture Radar (CSAR) has the advantage of continuous surveillance a fixed scene interest, which can provide high frame rate image sequences to detect ground moving targets. Recent image-sequence-based CSAR target detection methods utilize fact that signal moves fast in sequence. Knowledge target’s trace(moving trace sequence, is equal signature’s morphology full aperture image) help design better methods. However, previous signature studies are based on linear track geometry assumptions, cannot handle CSAR’s nonlinear track. Hence, this paper proposes new method range-Doppler principle. proposed deduct exact analytic function an arbitrary CSAR. assumes radar operates side-looking mode and plane. It combines equations(i.e., iso-range iso-Doppler relation) Cartesian transformation between coordinate system obtain parametric functions trace. Based method, three types motion (including motion) analyzed. validated with both simulated real data.