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首页> 外文期刊>IEEE Transactions on Antennas and Propagation >Piecewise and Wiener Filter-Based SAR Techniques for Monostatic Microwave Imaging of Layered Structures
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Piecewise and Wiener Filter-Based SAR Techniques for Monostatic Microwave Imaging of Layered Structures

机译：基于分段和维纳滤波器的SAR技术用于层状结构的单静态微波成像

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摘要

In this paper, two new techniques for microwave imaging of layered structures are introduced. These techniques were developed to address the limiting issues associated with classical synthetic aperture radar (SAR) imaging techniques in generating focused and properly-positioned images of embedded objects in generally layered dielectric structures. The first method, referred to as piecewise SAR (PW-SAR), is a natural extension of the classical SAR technique, and considers physical and electrical properties of each individual layer and the discontinuity among them. Although this method works well with low loss dielectric media, its applicability to lossy media is limited. This is due to the fact that this method does not consider signal attenuation. Moreover, multiple reflections within each layer are not incorporated. To improve imaging performance in which these important phenomena are included, a second method was developed that utilizes the Green's function of the layered structure and casts the imaging approach into a deconvolution procedure. Subsequently, a Wiener filter-based deconvolution technique is used to solve the problem. The technique is referred to as Wiener filter-based layered SAR (WL-SAR). The performance and efficacy of these SAR based imaging techniques are demonstrated using simulations and corresponding measurements of several different layered media.
机译：本文介绍了两种用于层状结构微波成像的新技术。开发这些技术是为了解决与传统的合成孔径雷达（SAR）成像技术相关的局限性问题，这些技术在生成通常分层的介电结构中的嵌入式对象的聚焦且正确放置的图像中。第一种方法称为分段SAR（PW-SAR），是传统SAR技术的自然扩展，它考虑了每个单独层的物理和电学特性以及其中的不连续性。尽管此方法适用于低损耗电介质，但其对有损耗介质的适用性受到限制。这是因为该方法未考虑信号衰减。而且，未在每一层内合并多次反射。为了提高包括这些重要现象的成像性能，开发了第二种方法，该方法利用了分层结构的格林函数并将成像方法转换为反卷积过程。随后，基于维纳滤波器的反卷积技术用于解决该问题。该技术称为基于维纳滤波器的分层SAR（WL-SAR）。这些基于SAR的成像技术的性能和功效通过对几种不同分层介质的仿真和相应测量得到了证明。

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