Abstract
In this paper, we propose a new three dimensional cylindrical imaging system based on the combination of a multiple-input multiple-output arc array in azimuth and a synthetic aperture radar on the vertical dimension for applications focused on buried threat detection. Imaging algorithms are adapted to these specific transceiver distributions in order to accelerate reconstructions in the Fourier domain. Following theoretical developments, an experimental proof of concept is proposed at 6 GHz using a circular dual positioning system specifically designed for these new studies. The validity of the proposed techniques is extended to larger cylindrical arrays using numerical simulations of complex volumetric scenes in the 5–12 GHz band. This work allows for significant gains in computation time for these specific imaging systems, which are more than three orders of magnitude shorter than those of conventional backpropagation techniques in the studied cases composed of more than 250,000 voxels.
Highlights
N OWADAYS, the detection of concealed threats in public places is mainly ensured by means of metal detectors for personnel screening and X-ray systems for imaging through hand-carried items
multiple-input multiple-output (MIMO)-SAR security scanners tend to be limited by the presence of blind spots linked to geometric considerations coupled with specularity phenomena [14], [15], [16], limiting for example the detection of concealed threats on the sides of the scanned subject
In contrast to the systems existing in the literature, the antennas that composed the MIMO array are positioned on an arc around the stage and a vertical displacement system is used to synthesize a 2D radiating aperture (Fig. 1e)
Summary
N OWADAYS, the detection of concealed threats in public places is mainly ensured by means of metal detectors for personnel screening and X-ray systems for imaging through hand-carried items. Despite these attractive performances, MIMO-SAR security scanners tend to be limited by the presence of blind spots linked to geometric considerations coupled with specularity phenomena [14], [15], [16], limiting for example the detection of concealed threats on the sides of the scanned subject. In contrast to the systems existing in the literature, the antennas that composed the MIMO array are positioned on an arc around the stage and a vertical displacement system is used to synthesize a 2D radiating aperture (Fig. 1e) This architecture being novel, an adapted fast reconstruction algorithm based on Fourier transforms is developed. A conclusion will be proposed at the very end to give an overview of the document
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