A millimeter‐wave radar based on active invers scattering approach for two dimensional screening of metallic and nonmetallic concealed targets is presented. The perceived challenges of detecting a nonmetallic target exhibiting poor dynamic range for measurement systems are analyzed and discussed by comparing the performance of three different antenna sensors. A short time duration pulse with frequency sweep covering 27 to 33 GHz band is used to feed the antenna sensors. In our experimental test, we buried a concealed target consists of metallic or dielectric strips under a dielectric layer that simulates the human body model. Waveguide and printed antipodal Vivaldi antennas are considered to study the target detectability and the quality of the measured millimeter‐wave images. The use of proposed AVA resulted in a better‐quality image with lower noise effect for both metallic and nonmetallic cases.

中文翻译：

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基于毫米波逆散射法的金属和非金属隐蔽目标检测

提出了一种基于主动逆散射方法的毫米波雷达，用于二维筛选金属和非金属隐蔽目标。通过比较三种不同天线传感器的性能，分析和讨论了检测测量系统动态范围较差的非金属目标的挑战。频率扫描覆盖27至33 GHz频段的短时脉冲用于向天线传感器供电。在我们的实验测试中，我们在模拟人体模型的介电层下掩埋了由金属或介电条组成的隐藏目标。考虑使用波导和对偶印刷的维瓦尔第天线来研究目标可检测性和测得的毫米波图像的质量。