【摘要】 介绍了一套基于频率步进机制的W波段三维近场安检成像系统以及相应的成像算法.W波段信号可以穿透普通衣物,对人员携带的藏匿物品进行成像.成像算法通过在频率波数域进行插值处理可以完全补偿近场的波前曲面.文中阐述了频率波数域的插值过程以及实验数据的预处理过程.成像系统通过发射宽带信号得到高分辨距离像,通过提高工作频率得到高分辨方位像,方位向分辨率优于5 mm.成像实验结果表明该系统性能优于现有的Ka波段成像系统.更多还原

【Abstract】 A W-band stepped-frequency three-dimensional near-field surveillance imaging system together with an effective radar imaging algorithm is presented.W-band signal is able to penetrate common clothing barriers to form an image of a person as well as any concealed items.Performing the image reconstruction procedure in the frequency – wavenumber domain,the algorithm is able to completely compensate the wavefront curvature in the near field through interpolation process.The interpolation relationship in frequency – wavenumber domain between sampled data and desired data was demonstrated.Moreover,the difference between algorithm model and experimental data are revealed.High range resolution and lateral resolution were obtained by emitting wideband stepped frequency signal and adopting high operating frequency.The cross-range resolution of the imaging result is better than 5 mm.The scheme of imaging system is described in detail along with a set of imaging results to showits superior imaging precision and sensitivity compared with existing Ka-band equipment.更多还原