A Sparse Aperture MIMO-SAR-Based UWB Imaging System for Concealed Weapon Detection
A Sparse Aperture MIMO-SAR-Based UWB Imaging System for Concealed Weapon Detection
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DOI：
10.1109/tgrs.2010.2053038
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发表时间：
2011-01-01
影响因子：
8.2
通讯作者：
Yarovoy, Alexander G.
中科院分区：
文献类型：
--
作者：
Zhuge, Xiaodong;Yarovoy, Alexander G.
提出并研究了一种基于超宽带(UWB)传输、多输入多输出(MIMO)阵列和合成孔径雷达(SAR)相结合的高分辨率成像系统。从分辨率要求出发，研究了非单色波的空间采样准则。为了探索系统的分数带宽(而不是先前声称的孔径稀疏性)对稀疏孔径阵列成像能力的决定性影响，基于有效孔径原理设计了一种MIMO线阵。对于天线阵，设计了一种优化的超宽带天线，允许无失真的脉冲辐射，带宽大于150%。通过将MIMO阵列中的数字波束形成与合成孔径雷达(SAR)在正交方向上相结合，提出了一种显著减少天线单元数量的高分辨率三维体成像系统。在不同条件下，包括典型的隐蔽武器探测场景，对所提出的成像系统与传统的二维SAR进行了实验验证。成像结果验证了所提出的系统设计的正确性，显示了基于MIMO-SAR的超宽带系统在安全领域的巨大潜力。
A high-resolution imaging system based on the combination of ultrawideband (UWB) transmission, multiple-inputmultiple-output (MIMO) array, and synthetic aperture radar (SAR) is suggested and studied. Starting from the resolution requirements, spatial sampling criteria for nonmonochromatic waves are investigated. Exploring the decisive influence of the system's fractional bandwidth (instead of previously claimed aperture sparsity) on the imaging capabilities of sparse aperture arrays, a MIMO linear array is designed based on the principle of effective aperture. For the antenna array, an optimized UWB antenna is designed allowing for distortionless impulse radiation with more than 150% fractional bandwidth. By combining the digital beamforming in the MIMO array with the SAR in the orthogonal direction, a high-resolution 3-D volumetric imaging system with a significantly reduced number of antenna elements is proposed. The proposed imaging system is experimentally verified against the conventional 2-D SAR under different conditions, including a typical concealed-weapon-detection scenario. The imaging results confirm the correctness of the proposed system design and show a strong potential of the MIMO-SAR-based UWB system for security applications.