Walled LTSA array for rapid, high spatial resolution, and phase-sensitive Imaging to visualize plastic landmines
Walled LTSA array for rapid, high spatial resolution, and phase-sensitive Imaging to visualize plastic landmines
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DOI：
10.1109/tgrs.2007.897418
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发表时间：
2007-08-01
影响因子：
8.2
通讯作者：
Hirose, Akira
中科院分区：
文献类型：
--
作者：
Masuyama, Soichi;Hirose, Akira
我们提出了一个壁线性锥形缝隙天线（LTSA）阵列可视化塑料地雷。在此之前，我们报告了一个自适应非线性可视化系统的基础上，复值自组织映射（CSOM），处理复振幅纹理反射图像在多个频率。该系统通过高空间分辨率和宽带反射测量获得的纹理特征来区分地雷和杂波。由于该系统采用一对喇叭天线的机械扫描，因此测量需要很长时间。阵列天线可以减少时间。因此，要在那里使用的天线元件应该是紧凑的和宽带的。本文报道了一个壁LTSA阵列可视化系统的设计和制作。天线元件具有14 x 28 mm的孔径尺寸，工作在8-12 GHz频段。由于该结构是玻璃环氧树脂基板和金属板的简单组合，因此可以容易地制造低成本和轻量化的阵列。电气开关实现了总共12 x 12 = 144个元件的高速扫描。我们还报告了可视化实验的结果，其中塑料地雷清楚地可视化与自适应CSOM处理相结合的阵列。在10千兆赫频率上探测地雷，可能只对埋在几厘米深或土壤衰减很低的目标才有可能。这可能是该方法适用性的严重限制，因为在野外条件下，通常会遇到10 dB或更大的土壤衰减，要求雷达在低于2-3 GHz的频率下工作。最好的解决方案可能是一个多传感器系统，包括这些互补的高频和低频雷达。
We propose a walled linearly tapered slot antenna (LTSA) array to visualize plastic landmines. Previously, we reported an adaptive nonlinear visualization system based on a complex-valued self-organizing map (CSOM) that deals with complex amplitude texture in reflection images at multiple frequencies. The system distinguishes landmines from clutter by paying attention to textural features obtained by high spatial resolution and wideband reflection measurement. Because the system employed a mechanical scan of a pair of horn antennas, the measurement required a long time. An array antenna can reduce the time. The antenna element to be used there should therefore be compact and wideband. This paper reports the design and fabrication of a walled LTSA array visualization system. The antenna element has a 14 x 28 mm aperture size, and works at the 8-12-GHz frequency band. Because the structure is a simple combination of glass epoxy substrates and metal plates, we can easily fabricate low-cost and lightweight arrays. Electrical switches realize a high-speed scanning of 12 x 12 = 144 elements in total. We also report the results of a visualization experiment, in which plastic landmines are clearly visualized with the array in combination with the adaptive CSOM processing. Detection of landmines at frequencies of 10 GHz is only likely to be possible for targets buried a few centimeters deep or where the soil attenuation is very low. This might be a severe limitation of applicability of the method, as in field conditions soil attenuations of 10 dB or considerably more are commonly encountered, requiring the radar to operate at frequencies below 2-3 GHz. The best solution may be a multisensor system comprising these complementary high- and low-frequency radars.