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Fast Modeling Methods for Estimating Imaging Performance of Whole Body Screening
摘要： Simulation of millimeter wave imaging system for whole body screening before a safety inspection manufactured is a challenging work. The conventional physical optics (PO) method is a proper high-frequency approximation method to solve the forward problem of imaging. In this letter, a modi?ed PO method is used to calculate not only metal scatterer but also non-metal dielectric medium. A ray tracing (RT) method and its modi?cation are proposed to further fast estimate the performance of multiple-input-multiple-output (MIMO) imaging system. The radiation pattern of transmitter or receiver is taken into account, then the rough imaging performance of arbitrary MIMO system on arbitrary human posture can be acquired in seconds to make the system design ?exible and convenient. The image reconstruction of the proposed method for a human body model with dielectric skin medium and metal pistol has demonstrated the applicability to real-life applications.
关键词： Millimeter wave imaging,concealed weapon detection (CWD),Image reconstruction,Physical optics (PO),Ray tracing (RT),Multiple-input-multiple-output (MIMO)
更新于2025-09-10 09:29:36
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[Institution of Engineering and Technology 12th European Conference on Antennas and Propagation (EuCAP 2018) - London, UK (9-13 April 2018)] 12th European Conference on Antennas and Propagation (EuCAP 2018) - Hybrid Physical Optics-Ray Tracing Method for the RCS Calculation of Electrically Large Objects Covered with Radar Absorbing Materials
摘要： A hybrid method based on Ray Tracing and Physical Optics for the estimation of the radar cross section of large metallic targets covered with radar absorbing materials is presented. The reflection coefficient of the multilayer structure composed by the metallic layer covered with radar absorbing materials is analytically evaluated through a transmission line model. The accuracy of the Radar Cross Section estimation is validated by full-wave simulations based on the Method of Moments. A corner reflector coated with Radar Absorbing Material (RAM) is used as a test-case of the proposed method. The obtained results exhibit a good agreement if compared against full-wave simulations.
关键词： Physical Optics (PO),Impedance Boundary Condition (IBC),Ray Tracing (RT),Radar Absorbing Material (RAM),Frequency Selective Surface (FSS)
更新于2025-09-04 15:30:14