2-Dimensional Accurate Imaging with UWB Radar Using Indoor Multipath Echoes for a Target in Shadow Regions
2-Dimensional Accurate Imaging with UWB Radar Using Indoor Multipath Echoes for a Target in Shadow Regions
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DOI：
10.1587/transcom.e94.b.2366
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发表时间：
2011-08-01
影响因子：
0.7
通讯作者：
Sato, Toru
中科院分区：
文献类型：
--
作者：
Fujita, Shuhei;Sakamoto, Takuya;Sato, Toru
超宽带（UWB）脉冲雷达由于其突出的高距离分辨力，在侦察系统中具有广阔的应用前景。为了实现一个准确的UWB雷达成像系统，我们提出了一种新的方法，采用多径回波从目标在室内环境。使用多径回波，所提出的系统可以准确地估计图像，即使是在阴影区域的目标，其中的目标是看不见的天线。我们应用一个简单的干涉技术，使用多个镜像天线产生的多径传播。我们发现，这种简单的方法也产生了许多不希望的假像点。为了解决这个问题，我们还提出了一种有效的虚假图像减少算法来获得清晰的图像。仿真结果表明，该方法去除了大部分伪像点，准确地估计了目标形状。
UWB (Ultra Wide-Band) pulse radar is promising for surveillance systems because it has an outstanding high range-resolution. To realize an accurate UWB radar imaging system, we propose a new approach that employs multipath echoes from a target in an indoor environment. Using multipath echoes, the proposed system can accurately estimate images, even for targets in a shadow region where the targets are out of sight of the antenna. We apply a simple interferometry technique using the multiple mirror image antennas generated by multipath propagation. We find that this simple method also produces many undesired false image points. To tackle this issue, we also propose an effective false image reduction algorithm to obtain a clear image. Numerical simulations verify that most of the false image points are removed and the target shape is accurately estimated.