Wavenumber Domain Correction Based Method for Near-Field 3-D Imaging Using Millimeter Waves

Aiming at the three-dimensional (3-D) imaging task under the planar synthetic aperture system, inspired by the classical Range Doppler Algorithm, this paper proposes a novel 3-D imaging algorithm based on the wavenumber domain correction, which has a simpler and more intuitive imaging process and faster computational efficiency. This paper analyzes the expression of 3-D echo data in the horizontal frequency (wavenumber) domain, vertical frequency domain, and range domain. The result indicates that the range migration of the target in the 3-D frequency domain is in the shape of an arc surface, and the range migration equation has a very simple mathematical form. The signal can be easily decoupled in three dimensions by range migration correction, and then the two-dimensional (2-D) inverse Fourier transform is used to reconstruct the 3-D image. The effectiveness of the proposed algorithm is verified by simulation and measured data.