NDLI: Two-dimensional frequency decoupling method for curved trajectory synthetic aperture radar imaging

Content Provider	IET Digital Library
Author	Wu, Junjie An, Hongyang Zhang, Qianghui Sun, Zhichao Li, Zhongyu Du, Ke Huang, Yulin Yang, Jianyu
Abstract	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.
Starting Page	766
Ending Page	773
Page Count	8
ISSN	17518784
Volume Number	12
e-ISSN	17518792
Issue Number	Issue 7, Jul (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rsn/12/7
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rsn.2017.0560
Journal	IET Radar, Sonar & Navigation
Publisher Date	2018-03-27
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	2D Frequency Decoupling Method 2D Point Target Reference Spectrum 2D Space Variance Characteristics Azimuth-variance Echo Processing Curved Trajectory Synthetic Aperture Radar Imaging Doppler Modulation Doppler Radar Fourth-order Taylor Series Expansion Geosynchronous SAR Missile-borne SAR Modulation Modulation And Coding Method Optical, Image And Video Signal Processing Radar Equipment Radar Imaging Range Cell Migration SAR Imaging Series (Mathematics) Synthetic Aperture Radar System And Application Two-dimensional Frequency Decoupling Method Two-dimensional Space Variance
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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