An Efficient Backprojection Algorithm Based on Wavenumber-Domain Spectral Splicing for Monostatic and Bistatic SAR Configurations

This paper introduces a fast backprojection synthetic aperture radar (SAR) imaging algorithm based on wavenumber-domain spectral splicing. The traditional fast backprojection (FBP) algorithm establishes the polar coordinate system with the center of the sub-aperture as the origin. Therefore, the coo...

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Bibliographic Details
Published in:Remote sensing (Basel, Switzerland) Switzerland), 2022-04, Vol.14 (8), p.1885
Main Authors: Sun, Huarui, Sun, Zhichao, Chen, Tianfu, Miao, Yuxuan, Wu, Junjie, Yang, Jianyu
Format: Article
Language:English
Subjects:
Accuracy
Aircraft
Algorithms
Aperture imaging
bistatic forward-looking SAR
Configurations
Domains
Efficiency
fast backprojection
high speed mobile platform
Polar coordinates
Radar imaging
Splicing
Synthetic aperture radar
Topography
Wavelengths
wavenumber-domain
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Summary:This paper introduces a fast backprojection synthetic aperture radar (SAR) imaging algorithm based on wavenumber-domain spectral splicing. The traditional fast backprojection (FBP) algorithm establishes the polar coordinate system with the center of the sub-aperture as the origin. Therefore, the coordinates of the image obtained from each sub-aperture are different. Sub-aperture images must be projected to a uniform coordinate system before they can be coherently superimposed to form the final image, which requires a large amount of calculation. In order to deal with this problem, this paper proposes a novel imaging method, which uses the same polar coordinate system for each sub-aperture. The sub-aperture images are then spliced in the wavenumber-domain, and directly added after upsampling. This method avoids the projection from each sub-aperture to the uniform coordinate system, thus improving the imaging accuracy and efficiency. At the same time, the algorithm is suitable for various configurations, and can achieve good imaging results for bistatic forward-looking SAR and high-speed mobile platform. Finally, simulations are presented to demonstrate the effectiveness of the algorithm.
ISSN:2072-4292
2072-4292
DOI:10.3390/rs14081885