Extended Omega-k algorithm for synthetic aperture radar imaging in multi-layer medium
Received:February 25, 2019  Revised:April 21, 2020  download
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Author NameAffiliationE-mail
ZHENG Hai-Tao Dept. of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China zhenghaitaobit@hotmail.com 
LI Shi-Yong Dept. of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China 877189316@qq.com 
DO. James Dept. of Electrical and Computer Engineering, University of California, Davis, CA, 95616, United States  
SUN Hou-Jun Dept. of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China  
LIU Xiao-Guang Dept. of Electrical and Computer Engineering, University of California, Davis, CA, 95616, United States  
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 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 applications.
keywords:ground-penetrating radar  phase migration  extended Omega-k  velocity estimation
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Copyright:《Journal of Infrared And Millimeter Waves》