Extended Omega-k Algorithm for Synthetic Aperture Radar Imaging in Multi-layer Medium
投稿时间:2019-02-25  修订日期:2020-01-17  download
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郑海涛 北京理工大学信息与电子学院 zhenghaitaobit@hotmail.com 
李世勇 北京理工大学信息与电子学院 877189316@qq.com 
DoJames T. 北京理工大学信息与电子学院  
孙厚军 北京理工大学信息与电子学院  
‘Leo’LiuXiaoguang 北京理工大学信息与电子学院  
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 significantly less computation complexity than the PSM algorithm. The extended Omega-k exploits fast interpolation in the wavenumber domain instead of iteratively 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 from 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 applications.
keywords:Ground penetrating radar  phase shift migration  extended Omega-k  velocity estimation
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Copyright:《Journal of Infrared And Millimeter Waves》