Abstract
Due to the fact that a millimeter-wave (MMW) has a strong ability to penetrate clothing, MMW holographic imaging technology can conduct a non-contact inspection of the human body’s surface. In recent years, personnel surveillance systems utilizing MMW holographic imaging technology has achieved rapid progress. However, limited by MMW holographic imaging’s image quality, the existing imaging technology cannot accurately detect whether the human body carries hidden objects. Additionally, real-time inspection requirements cannot be practically satisfied, and the system cost is relatively high. In this paper, a reconstruction algorithm with enhanced imaging quality, which can solve the problem of spherical wave attenuation with distance, making imaging results more accurate. The sampling conditions and imaging resolution are simulated and analyzed, which verify the azimuth resolution. Furthermore, the antenna beam’s holographic imaging simulation is optimized, effectively improving the quality of the reconstructed image. The proposed scheme provides theoretical support for determining antenna step and scanning aperture size in engineering and have theoretical guiding significance for improving the image quality of millimeter-wave holography and reducing system cost.
Highlights
Due to the fact that a millimeter-wave (MMW) has a strong ability to penetrate clothing, MMW holographic imaging technology can conduct a non-contact inspection of the human body’s surface
In 2015, Baccouche proposed the 12 transmitting and 12 receiving sparse array imaging system that works in 75–110 GHz; the holographic reconstruction algorithm relies on increasing the system bandwidth, which increases the system cost [3]
This paper proposes a two-dimensional planar accurate holographic reconstruction algorithm based on angular spectrum theory, which solves the problem of spherical wave attenuation with distance
Summary
Millimeter-wave imaging has various advantages, including with no risk of ionizing radiation, strong penetrating power on clothing, high imaging resolution, etc. The accurate reconstruction algorithm of millimeter-wave holographic imaging is used to verify the azimuth resolution. The main lobe of the antenna beam in the holographic simulation was optimized from 8.8◦ to 57.0◦ , effectively improving the reconstructed image quality. The proposed algorithm can determine the size of the optimal sampling plane, taking into account the image quality and operation time, and provide basic theoretical support for determining antenna stepping and scanning aperture in engineering. This paper provides a theoretical basis for the optimization of a transmitting antenna beam and an obtained high resolution reconstruction image in the practical engineering application. The research on millimeter-wave accurate holographic reconstruction algorithms in this paper provides a theoretical support for applying millimeter-wave imaging systems in human security
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