Abstract
Terahertz (THz) radar system can realize high-resolution imaging benefits from its advantages, such as wide bandwidth and short synthetic aperture time. However, due to the short wavelength in the THz frequency range, multi-scattering center effect of targets generally occurs. This paper considers the mismatch between imaging aperture and target characteristics leads to serious resolution degradation, imaging defocus and loss of target details. We propose an aperture adaptive scale transform (AAST) imaging method, which is implemented in three steps. First, the sub-aperture is adaptively divided by matching the azimuth with the scattering characteristics. Then the apertures which contain different details of the target are scaled by weight. Finally, the generalized likelihood ratio test method is used to reconstruct the fine image results of incoherent scale transformation, resulting in more detailed information and higher definition in imaging results. We use a terahertz radar system operating at 0.34 THz and with a bandwidth of 28.8 GHz to scan around a target. The imaging results of measured echo corroborate the validity of the proposed algorithm.
Published Version
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