Signal-to-clutter ratio enhancement in bistatic very high frequency (VHF)-band SAR images of truck vehicles in forested and urban terrain
Signal-to-clutter ratio enhancement in bistatic very high frequency (VHF)-band SAR images of truck vehicles in forested and urban terrain
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DOI：
10.1049/iet-rsn.2009.0039
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发表时间：
2010-06-01
影响因子：
1.7
通讯作者：
Stenstrom, G.
中科院分区：
文献类型：
--
作者：
Ulander, L. M. H.;Barmettler, A.;Stenstrom, G.
在VHF波段合成孔径雷达中，尤其是在森林和城市地形中，多次散射往往是一种主要的散射机制。在这方面最重要的是多个散射产生的双或三反弹散射的正交角的结构，往往占主导地位的单站SAR的几何形状。例子包括来自垂直树干或水平地面上的建筑物墙壁的双反弹散射。在这种情况下，双基地SAR可以提供一个显着的优势相比，单基地SAR通过选择一个合适的双基地成像几何。我们给出的实验结果表明，在双基地VHF为基础的SAR（28-73 MHz）的信号杂波比增加。结果表明，在森林和城市杂波背景下，车辆的信杂比随着侧射双基地仰角从4 °增加到20 °而增加，最多可达10 dB。结果表明，在VHF波段SAR中使用双基地几何结构可以显著提高森林和城市地形中车辆大小目标的检测性能。
Multiple scattering is often a dominating scattering mechanism in VHF-band SAR, in particular in scenes including forested and urban terrain. Most important in this context is multiple scattering generated by double- or triple-bounce scattering from structures with orthogonal corners which often dominate for monostatic SAR geometries. Examples include double-bounce scattering from vertical tree stems or building walls on horizontal ground. In such situations, bistatic SAR may offer a significant advantage compared to monostatic SAR by choosing a suitable bistatic imaging geometry. We give experimental results which show increased signal-to-clutter ratio in bistatic VHF-based SAR (28-73 MHz). Results show that the signal-to-clutter ratio of a vehicle truck in a background of forest and urban clutter increases by up to 10 dB when the broadside bistatic elevation angle increases from 4 to 20 degrees. The results indicate that significant improvement in detection performance can be expected for vehicle-sized objects in forest and urban terrain by using bistatic geometries in VHF-band SAR.