Abstract
W-band electromagnetic vortex-waves generated by a uniform circular array are tightly collimated by a paraboloidal reflector into a radiation cone with a small vertex angle and beam width. A low height drone-borne super-resolution conceptual imaging radar is designed and analyzed comprehensively yielding novel results. Range resolution is obtained by a wideband linear frequency modulation waveform. Angular resolutions are based on the antenna beam widths and the orthogonality of vortex wave modes. Novel algorithms for angular localizations of multiple targets are given. The spatial resolutions associated with the geometry of a down looking radar and the ground are given. Though, no platform motion is needed for vortex imaging, Doppler beam sharpening is also implemented for a slowly moving drone-borne radar for an additional resolution capability.
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