Fourier-Based 2-D Imaging Algorithm for Circular Synthetic Aperture Radar: Analysis and Application

Circular synthetic aperture radar (CSAR) has become a research hotspot in the SAR community. Since the Fourier-based imaging methods of CSAR are underdeveloped, further developments have to be investigated. In this paper, the exact expression and property analysis of the spectrum of CSAR are present...

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Bibliographic Details
Published in:IEEE journal of selected topics in applied earth observations and remote sensing 2016-01, Vol.9 (1), p.475-489
Main Authors: Jia, Gaowei, Buchroithner, Manfred F., Chang, Wenge, Liu, Zhaohe
Format: Article
Language:English
Subjects:
Algorithms
Apertures
Circular synthetic aperture radar (CSAR)
Circularity
Consumption
Deviation
Filtering
Fourier-based imaging algorithm
Geometry
Ground plane
Imaging
Radar imaging
spectrum projection
subaperture
Synthetic aperture radar
Trajectory
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Summary:Circular synthetic aperture radar (CSAR) has become a research hotspot in the SAR community. Since the Fourier-based imaging methods of CSAR are underdeveloped, further developments have to be investigated. In this paper, the exact expression and property analysis of the spectrum of CSAR are presented first. It turns out that the challenges of the Fourier-based 2-D imaging processing of CSAR lie in the projection of spectrum from the slant plane into the ground plane. Correspondingly, a spectrum-projection method by matched filtering as well as the practical subaperture-based imaging flow of CSAR are proposed, during which the trajectory deviation has been taken into account. Simulation and experimental tests are carried out to measure the efficiency and accuracy of the proposed method. The corresponding results verify that the proposed signal model is correct and the presented imaging flow is a good candidate to produce well-focused CSAR imagery with much less time consumption.
ISSN:1939-1404
2151-1535
DOI:10.1109/JSTARS.2015.2502430