Extended Omega-k algorithm for synthetic aperture radar imaging in multi-layer medium

IF 0.6 4区 物理与天体物理 Q4 OPTICS
Zheng Hai-tao, Liao Shiyong, D. James, Sun Houjun, Liu Xiaoguang
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引用次数: 0

Abstract

Processing ground penetrating radar data to obtain well-focused images for object detection has been an active research area. Phase-shift migration(PSM)is a widely used method since it allows the wave velocity to vary with respect to multi-layer medium. However,this requires pixel-by-pixel calculation of the image,which is time-consuming. This paper presents an extended Omega-k algorithm for multi-layer medium imaging with signif⁃ icantly less computation complexity than the PSM algorithm. The extended Omega-k exploits fast interpolation in the wave-number domain instead of iterative calculating as done by PSM. The method of estimating the wave propagation velocity in different media is also proposed via vertex region extraction for phase compensation and image focusing. Various images of buried targets of a two-layer medium experiment are obtained,which validate the effectiveness of the proposed algorithm,and make it practical for some typical ground-based surveillance ap⁃ plications.
多层介质合成孔径雷达成像的扩展Omega-k算法
对探地雷达数据进行处理以获得聚焦良好的目标检测图像一直是一个活跃的研究领域。相移偏移(PSM)是一种广泛使用的方法,因为它允许波速相对于多层介质变化。然而,这需要逐像素计算图像,这是耗时的。本文提出了一种适用于多层介质成像的扩展ω -k算法,其计算复杂度明显低于PSM算法。扩展的ω -k利用波数域的快速插值,而不是像PSM那样进行迭代计算。提出了利用顶点区域提取进行相位补偿和图像聚焦来估计波在不同介质中的传播速度的方法。实验结果验证了该算法的有效性,并将其应用于一些典型的地面监控应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
1.20
自引率
14.30%
发文量
4258
审稿时长
2.9 months
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