Extended Imaging Algorithm Based on Aperture Synthesis With Double-Scattered Waves for UWB Radars
Extended Imaging Algorithm Based on Aperture Synthesis With Double-Scattered Waves for UWB Radars
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DOI：
10.1109/tgrs.2011.2158108
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发表时间：
2011-12
影响因子：
8.2
通讯作者：
S. Kidera;T. Sakamoto;Toru Sato
中科院分区：
文献类型：
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作者：
S. Kidera;T. Sakamoto;Toru Sato
超宽带（UWB）脉冲雷达具有很高的距离分辨率，适合于近场探测。UWB脉冲雷达的应用包括用于安全或救援目的的模糊视觉中的人体识别，以及用于工业产品（如反射器天线）的精确空间测量。合成孔径雷达在这些应用中仍然很有前途，因为它即使对自由空间中的近场目标也能产生精确的图像。然而，对于复杂形状或多个对象，该算法遭受增加的阴影区域，因为它仅采用单散射信号进行成像。针对这一问题，提出了一种基于孔径合成的双散射信号成像算法。通常，双散射波包括关于目标点的独立信息，这不是由单散射波获得的。基于这一原理，该方法有效地合成了双散射信号，并提高了目标形状的重建范围，其中一部分成为阴影，在前一种方法。为了提高准确性，一个假像抑制的方法，基于菲涅尔区理论也被纳入到所提出的方法。从数值模拟和实验的结果验证，我们的方法显着提高了目标表面的可见范围，没有目标形状的先验知识或其周围环境的初步观察。
Ultrawideband (UWB) pulse radar with high range resolution is suitable for near-field sensing. Applications of UWB pulse radar include human body identification in blurry vision for security or rescue purposes and accurate spatial measurements for industrial products such as a reflector antenna. The synthetic aperture radar is still promising for these applications because it creates an accurate image even for near-field targets in free space. However, for complex-shaped or multiple objects, this algorithm suffers from increased shadow region because it employs only a single-scattered signal for imaging. To resolve this difficulty, this paper proposes a novel imaging algorithm based on aperture synthesis for double-scattered signals. In general, double-scattered waves include independent information on target points, which are not obtained by a single-scattered wave. Based on this principle, the proposed method effectively synthesizes the double-scattered signals and enhances the reconstructible range of a target shape, part of which becomes a shadow in the former approach. In order to enhance accuracy, a false image suppression approach based on the Fresnel zone theory is also incorporated in the proposed method. The results from numerical simulations and an experiment verify that our method significantly enhances the visible range of target surfaces without either a priori knowledge of target shapes or preliminary observation of their surroundings.