Abstract
Due to the ability of three-dimensional (3-D) imaging and the acquirement of full-angle scatter targets information, circular synthetic aperture radar (CSAR) is one of the research hotspots in the field of 3-D SAR imaging. Firstly, aiming at the limitation of CSAR imaging in the same height plane, a spiral synthetic aperture radar (SSAR) imaging system based on cylindrical spiral trajetory was proposed in the terahertz(THz) frequence band. Under the SSAR imaging geometry, the echo signal model is established, and the corresponding 3-D imaging algorithm was derived. Secondly, the imaging performance of the SSAR imaging system was analyzed. After the reconstruction of all the scattering cells was accomplished, the final 3-D image was obtained. The imaging results of point targets simulation verified the advantages of the SSAR imaging system in the THz frequence band and the effectiveness of the imaging algorithm for the proposed model, which enables high-resolution 3-D imaging of the space targets.
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