A Wavenumber Domain Imaging Algorithm for Synthetic Aperture Interferometric Radiometry in Near-Field

摘要

This paper presents a passive-millimeter imaging algorithnm for synthetic aperture interferometric radiometry (SAIR) in near-field. The SAIR measures the visibility function of the scene by antenna arrays. In the far field, according to the Van Cittert-Zernike theorem, there is a Fourier transform between visibility function and scene brightness temperature. However, in the near field, because of the cross-coupling of azimuth direction and distance direction, Van Cittert-Zernike theorem is not valid. In this paper, the visibility function is transformed into wave number domain using spherical wave decomposition. After compensating the phase term related to the distance, the SAIR near-field imaging is realized.