NDLI: Real-time parameter estimation for SAR moving target based on WVD slice and FrFT

Content Provider	IET Digital Library
Author	Wang, Hanyun Jiang, Yicheng
Abstract	Most synthetic aperture radar (SAR) applies to static targets while moving targets appear unfocused in SAR images. To obtain clear images of moving targets, the Doppler parameter estimation is critical in SAR processing. However, most of the time–frequency analysis methods cannot simultaneously meet the requirements of accuracy and real time. A real-time parameter estimation algorithm based on Wigner–Ville distribution (WVD) slice and fractional Fourier transform (FrFT) is proposed. In this algorithm, the Doppler frequency rate is roughly estimated through the observed signal's WVD slices first. Then, its corresponding FrFT rotational angle is deduced and the search region is determined. Next, Doppler parameters can be accurately estimated by FrFT under the premise of reducing the computational complexity. Three reasonable choices of the slice positions are given and their estimation results are explained. SAR real data processing results indicate that the proposed algorithm can estimate Doppler parameters quickly and effectively while ensuring accuracy and providing a new way for SAR real-time parameter estimation. Finally, motion compensation in accord with the estimated parameters is also completed and focused images of several moving ship targets are obtained.
Starting Page	47
Ending Page	49
Page Count	3
ISSN	00135194
Volume Number	54
e-ISSN	1350911X
Issue Number	Issue 1, Jan (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/54/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2017.1740
Journal	Electronics Letters
Publisher Date	2017-11-17
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Doppler Parameter Estimation Fourier Transforms Fractional Fourier Transform FrFT Integral Transforms Mathematical Analysis Motion Compensation Radar Equipment Radar Imaging Real-time Parameter Estimation SAR Image SAR Moving Target Statistics Synthetic Aperture Radar System And Application Time-frequency Analysis Time–frequency Analysis Methods Wigner Distribution Wigner–Ville Distribution Slice WVD Slice
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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