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

1.Dept. of Electronic Engineering, Beijing Institute of Technology, Beijing 100081, China;2.Dept. of Electrical and Computer Engineering, University of California, Davis, CA 95616, United States

Clc Number:

TN951

Fund Project:

Supported in part by Elrha’s Humanitarian Innovation Fund programme,in part by the National Natural Science Foundation of China 61771049;This work is also under support of the Beijing Key Laboratory of Millimeter Wave and Terahertz TechnologySupported in part by Elrha’s Humanitarian Innovation Fund programme,in part by the National Natural Science Foundation of China(61771049). This work is also under support of the Beijing Key Laboratory of Millimeter Wave and Terahertz Technology.

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    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.

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ZHENG Hai-Tao, LI Shi-Yong, DO. James, SUN Hou-Jun, LIU Xiao-Guang. Extended Omega-k algorithm for synthetic aperture radar imaging in multi-layer medium[J]. Journal of Infrared and Millimeter Waves,2020,39(3):381~387

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History
  • Received:February 25,2019
  • Revised:April 21,2020
  • Adopted:February 08,2020
  • Online: April 14,2020
  • Published: