Algebraic reconstruction technique for millimeter-wave holographic imaging

Millimeter-wave (MMW) holographic imaging has been intensively investigated for the application of personnel inspection. In order to obtain high resolution images, synthetic aperture technique can be used to form large virtual aperture. However, the effective size of the synthetic aperture is always limited by the beamwidth of the transmitting and receiving antennas. In this paper, algebraic reconstruction technique (ART) is introduced for the reconstruction of MMW images with consideration of the radiation pattern of antennas. Since the effect of the radiation pattern is compensated, high resolution images can be achieved by overcoming the resolution limitation which is determined by the beamwidth of antennas. Simulations are presented to verify the proposed ART based MMW imaging reconstruction method.