23 May 2013 SAR focusing using multiple trihedrals
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Abstract
A recent circular synthetic aperture radar data collection contained various vehicles and calibration targets placed throughout a 5 km scene. By observing multiple orbits of the radar, the down-range distance measurements to scattering features show noticeable drift on the order of 2 m from orbit to orbit. The large scene contained 14 quad-trihedral calibration targets with radar cross sections that are similar to point targets in the elevation range of the scene. This paper presents an algorithm that uses the quad-trihedrals to generate global range focusing parameters and phase error corrections to the complex range profile. Qualitative and quantitative results show the focusing provides a significant improvement to wide-angle image registration and vehicle target discrimination.
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Kerry E. Dungan, John W. Nehrbass, "SAR focusing using multiple trihedrals", Proc. SPIE 8746, Algorithms for Synthetic Aperture Radar Imagery XX, 874606 (23 May 2013); doi: 10.1117/12.2015088; https://doi.org/10.1117/12.2015088
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