THz ISAR Imaging Using GPU-Accelerated Phase Compensated Back Projection Algorithm

1.Shanxi University;2.Captical Normal University;3.University of Tennessee

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National Natural Science Foundation of China(11804209), Ministry of Science and Technology of the People’s Republic of China (2012YQ14000508);

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    Here, we present our implementation of two-dimensional (2D) high-resolution inverse synthetic aperture radar (ISAR) imaging using a 0.22 THz stepped-frequency (SF) radar system. The system is suitable for both near- and far-field imaging with a synthesis bandwidth of 12 GHz. The radar can provide highly accurate range and cross-range results in the near field, and its ISAR image can reach centimeter-level resolution upon using a phase-compensated Back-Projection algorithm (BP algorithm). These BP-realized results indicate that THz ISAR imaging can achieve both higher precision and finer resolution when compared to previously demonstrated range-doppler (RD) results with the same SFCW radar setup. To accelerate BP’s relatively slow image retrieval process, we employ accelerated platforms based on a graph-processing unit (GPU). Such success should pave the way for further research on near-field high-resolution radar imaging especially at THz/sub-millimeter bands.

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  • Received:June 21,2021
  • Revised:September 22,2021
  • Adopted:September 27,2021
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