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http://dx.doi.org/10.5515/KJKIEES.2010.21.9.979

RCS Extraction of Trihedral Corner Reflector for SAR Image Calibration  

Kwon, Soon-Gu (Department of Electronic Information and Communication Engineering, Hongik University)
Yoon, Ji-Hyeong (Department of Electronic Information and Communication Engineering, Hongik University)
Oh, Yi-Sok (Department of Electronic Information and Communication Engineering, Hongik University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.9, 2010 , pp. 979-986 More about this Journal
Abstract
This paper presents an algorithm for retrieving precise radar cross sections(RCS) of various trihedral corner reflectors (TCR) which are external calibrators of synthetic aperture radar(SAR) systems. The theoretical RCSs of the TCRs are computed based on the physical optics(PO), geometrical optics(GO), and physical theory of diffraction(PTD) techniques; that is, the RCS computation includes the single reflections(PO), double reflections(GO-PO), triple reflections(GO-GO-PO), and edge diffractions(PTD) from the TCR. At first, we acquire an SAR image of the area that five TCRs installed in, and then extract the RCS of the TCRs. The RCSs of the TCRs are extracted accurately from the SAR image by adding up the power spill, which is generated due to the radar IRF(Impulse Response Function), using a square window. We compare the extracted RCSs with the theoretical RCSs and analyze the difference between the theoretical and experimental RCSs of the TCR for various window sizes and various backscattering coefficient levels of the adjacent area. Finally, we propose the minimum size of the integration area and the maximum level of the backscattering coefficients for the adjacent area.
Keywords
SAR Calibration; RCS of Trihedral Corner Reflector; Power Spill;
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Times Cited By KSCI : 1  (Citation Analysis)
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