Two-dimensional frequency decoupling method for curved trajectory synthetic aperture radar imaging
- Author(s): Junjie Wu 1 ; Hongyang An 1 ; Qianghui Zhang 1 ; Zhichao Sun 1 ; Zhongyu Li 1 ; Ke Du 2 ; Yulin Huang 1 ; Jianyu Yang 1
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View affiliations
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Affiliations:
1:
School of Electronic Engineering, University of Electronic Science and Technology of China , Chengdu , People's Republic of China ;
2: Shanghai Radio Equipment Research Institute , Shanghai , People's Republic of China
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Affiliations:
1:
School of Electronic Engineering, University of Electronic Science and Technology of China , Chengdu , People's Republic of China ;
- Source:
Volume 12, Issue 7,
July
2018,
p.
766 – 773
DOI: 10.1049/iet-rsn.2017.0560 , Print ISSN 1751-8784, Online ISSN 1751-8792
Synthetic aperture radar (SAR) imaging with curved trajectory is difficult due to its severe two-dimensional (2D) space variance. When processing the echo with azimuth-variance, the range cell migration and Doppler modulation of the targets with different azimuth locations are different, which brings a big challenge to image formation. Here, a 2D frequency decoupling method for this case is proposed. Firstly, the range history of the curved trajectory is accurately modelled based on fourth-order Taylor series expansion. Then, the 2D point target reference spectrum of the echo signal is obtained by the method of series reversion. The 2D space variance characteristics of two typical cases with curved trajectory, i.e. geosynchronous SAR and missile-borne SAR, are analysed. Based on the space variance characteristics, a 2D frequency decoupling step is implemented to handle the space-variant phase. Simulations are presented to demonstrate the effectiveness of the proposed algorithm.
Inspec keywords: series (mathematics); Doppler radar; radar imaging; modulation; synthetic aperture radar
Other keywords: 2D point target reference spectrum; two-dimensional space variance; 2D frequency decoupling method; Doppler modulation; two-dimensional frequency decoupling method; 2D space variance characteristics; fourth-order Taylor series expansion; range cell migration; SAR imaging; azimuth-variance echo processing; missile-borne SAR; curved trajectory synthetic aperture radar imaging; geosynchronous SAR
Subjects: Radar equipment, systems and applications; Optical, image and video signal processing; Modulation and coding methods
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