Radar response approximations for buried plastic landmines
Radar response approximations for buried plastic landmines
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埋藏塑料地雷的雷达响应近似值
DOI：
10.1117/12.462309
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
M. Verhaegen
中科院分区：
文献类型：
--
作者：
F. Roth;P. van Genderen;M. Verhaegen
本文分析了塑料地雷等埋地可穿透目标的早期雷达响应。玻恩近似是用来推导简单的分析表达式有关的目标和土壤特性的早期响应。了解这些依赖关系是至关重要的目标识别在不同的土壤条件下。导出的表达式包含了均匀有耗媒质中可穿透目标在均匀平面波照射下的传递函数和脉冲响应。以PMA-3型地雷为例，将Born近似法预测的早期响应与三维时域有限差分法（FDTD）模拟得到的响应进行了比较。结果表明，利用玻恩近似，可以预测目标响应的一般形状，即振幅峰的数量，以及与来自示例目标的顶部的反向散射相关的那些峰的振幅。为了提高预测和模拟响应之间的拟合，提出了两个现象学动机的早期响应表达式的修改。修正后的表达式不仅能够准确地预测早期响应的一般形状，而且还可以预测宿主介质电导率对目标脉冲响应的影响。
This paper analyzes the early-time radar response of buried penetrable targets such as plastic landmines. The Born approximation is used to derive simple analytical expressions relating target and soil properties to the early-time response. Understanding these dependencies is crucial for target identification under varying soil conditions. The derived expressions include the transfer function and the impulse response of a penetrable target embedded in an unbounded homogeneous lossy medium and illuminated by a uniform plane wave. Using a truncated circular cylinder having the dimensions of a PMA-3 mine as an example, the early time responses predicted by the Born approximation are compared against responses obtained by three-dimensional finite-difference time-domain (FDTD) simulations. The results demonstrate that with the Born approximation it is possible to predict the general shape of the target response, i.e. the number of amplitude peaks, as well as the amplitudes of those peaks that relate to backscatter from the top of the example target. To improve the fit between the predicted and simulated responses, two phenomenologically motivated modifications to the early-time response expressions are proposed. The modified expressions are able to accurately predict not just the general shape of the early-time response, but also the influence of the host medium conductivity on the target impulse response.