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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Image-Domain Estimation of Wall Parameters for Autofocusing of Through-the-Wall SAR Imagery
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Image-Domain Estimation of Wall Parameters for Autofocusing of Through-the-Wall SAR Imagery

机译：穿墙SAR图像自动聚焦的墙参数的图像域估计

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摘要

Estimation of the basic parameters, wall thickness and dielectric constant, is important in through-the-wall radar imaging. Ambiguities in wall characteristics will degrade the image focusing quality of synthetic-aperture radar. In order to obtain a quick and precise estimation of wall parameters, an equivalent propagation model of an electromagnetic wave in the air–wall–air medium is first developed in this paper. According to the developed propagation model, two filter-based approaches, denoted respectively as the echo-domain-filter-based method and the image-domain-filter-based method, are proposed to estimate wall thickness and dielectric constant by adjusting the two corresponding parameters of the echo-domain filter or the image-domain filter to obtain the best focusing quality of behind-the-wall targets. The processing schemes of the two methods show that the image-domain-filter-based method is more efficient because it does not involve imaging processing in each adjustment. Moreover, the image-domain-filter-based method is accelerated by reducing the dimension of searching space to better the computational efficiency further. Simulation results show that the proposed accelerating image-domain-filter-based method can provide quick and precise estimation of wall parameters.
机译：基本参数，壁厚和介电常数的估计对于穿墙雷达成像很重要。墙壁特性的歧义会降低合成孔径雷达的图像聚焦质量。为了快速准确地估计壁参数，本文首先建立了电磁波在空气-壁-空气介质中的等效传播模型。根据建立的传播模型，提出了两种基于滤波器的方法，分别表示为基于回波域滤波器的方法和基于像域滤波器的方法，通过调整两种方法来估计壁厚和介电常数回波域滤镜或图像域滤镜的参数，以获得墙后目标的最佳聚焦质量。这两种方法的处理方案表明，基于图像域滤波器的方法效率更高，因为它在每个调整中均不涉及成像处理。此外，通过减小搜索空间的尺寸来加速基于图像域滤波器的方法，以进一步提高计算效率。仿真结果表明，所提出的基于图像域加速滤波的方法可以快速准确地估计墙体参数。

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