Journal ArticleDOI
Ground Moving Target Imaging Based on Keystone Transform and Coherently Integrated CPF With a Single-Channel SAR
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TLDR
A maneuvering target refocusing method based on keystone transform and coherently integrated cubic phase function (CICPF) is proposed to deal with ground moving targets smeared in a synthetic aperture radar (SAR) image.Abstract:
It is well known that ground moving targets may be smeared in a synthetic aperture radar (SAR) image due to the range migration, Doppler phase broadening, and velocity ambiguity caused by target unknown motion parameters, especially for the accelerating targets within a long observation time. To deal with these problems, a maneuvering target refocusing method based on keystone transform (KT) and coherently integrated cubic phase function (CICPF) is proposed in this paper. First, an azimuth deramp function is constructed along the slow-time dimension at each range-frequency gate to reduce the order of envelope migration and phase response over the slow-time. Then, the residual range walk and the time-varying Doppler phase are eliminated by the KT and the CICPF, respectively. With the estimated motion parameters, moving targets can be finely refocused. Both simulated and real SAR data processing results are presented to validate the proposed algorithm.read more
Citations
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Journal ArticleDOI
STGRFT for Detection of Maneuvering Weak Target With Multiple Motion Models
TL;DR: The short-time generalized Radon Fourier transform (STGRFT) based LTCI algorithm is proposed and the results confirm that in terms of integration gain, input–output signal-to-noise ratio performance and detection ability, STGRFT-based method is superior to the existing popular L TCI algorithms.
Journal ArticleDOI
Ground Moving Target Refocusing in SAR Imagery Based on RFRT-FrFT
TL;DR: A new algorithm is presented to image ground moving targets in a synthetic aperture radar (SAR) system based on range frequency reversal transform-fractional Fourier transform (RFRT-FrFT), which can significantly decrease the computational complexity in target envelope migration elimination.
Journal ArticleDOI
Refocusing and Motion Parameter Estimation for Ground Moving Targets Based on Improved Axis Rotation-Time Reversal Transform
TL;DR: A new algorithm is presented to image ground moving targets and estimate their motion parameters in a synthetic aperture radar system based on improved axis rotation-time reversal transform (IAR-TRT), which has a relatively low computational complexity.
Journal ArticleDOI
WRFRFT-based Coherent Detection and Parameter Estimation of Radar Moving Target With Unknown Entry/Departure Time
TL;DR: In this article, the authors considered the coherent detection and parameters estimation problem for a radar moving target with unknown entry time and departure time (that is, the time when the target appears-in/leaves the radar detection field is unknown), involving across range cell and Doppler spread (DS) effects within the observation period.
Journal ArticleDOI
Ground Moving Target Detection and Trajectory Reconstruction Methods for Multichannel Airborne Circular SAR
TL;DR: In this article , a framework of multichannel synthetic aperture radar ground moving target indication (SAR-GMTI) is presented to address the problem that slow-moving targets, which are buried in strong stationary ground clutter, are difficult to be detected.
References
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Journal ArticleDOI
SAR imaging of moving targets
TL;DR: A method of forming synthetic aperture radar images of moving targets without using any specific knowledge of the target motion is presented, using a unique processing kernel that involves a one-dimensional interpolation of the deramped phase history which is called keystone formatting.
Journal ArticleDOI
Radon-Fourier Transform for Radar Target Detection, I: Generalized Doppler Filter Bank
TL;DR: Detailed comparisons between the RFT and the well-known moving target detection (MTD) method are provided and it is shown that MTD is actually a special case of R FT and RFT is a kind of generalized Doppler filter bank processing for targets with across range unit (ARU) range walk.
Journal ArticleDOI
The discrete polynomial-phase transform
S. Peleg,Benjamin Friedlander +1 more
TL;DR: The authors define the discrete polynomial-phase transform, derive its basic properties, and use it to develop computationally efficient estimation and detection algorithms.
Journal ArticleDOI
Maneuvering Target Detection via Radon-Fractional Fourier Transform-Based Long-Time Coherent Integration
TL;DR: The results demonstrate that for integration gain and detection ability, the proposed method is superior to MTD, FRFT, and Radon-Fourier transform under low signal-to-clutter/noise ratio (SCR/SNR) environments.
Journal ArticleDOI
A Keystone Transform Without Interpolation for SAR Ground Moving-Target Imaging
Daiyin Zhu,Yong Li,Zhaoda Zhu +2 more
TL;DR: In this letter, a realization of the keystone transform avoiding interpolation is presented and the moving target is coarsely focused according to the SAR geometry and the platform velocity while exploiting the scaling principle.
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