TY - JOUR
T1 - Ground Moving Target Refocusing in SAR Imagery Based on RFRT-FrFT
AU - Huang, Penghui
AU - Xia, Xiang Gen
AU - Gao, Yesheng
AU - Liu, Xingzhao
AU - Liao, Guisheng
AU - Jiang, Xue
N1 - Publisher Copyright:
© 1980-2012 IEEE.
PY - 2019/8
Y1 - 2019/8
N2 - In this paper, 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). In this algorithm, a range compressed signal is initially transformed into the range frequency domain and then RFRT is proposed to directly compensate the range migration via multiplying the signal in the range frequency domain by its reversed data according to the equal interval sampling of range frequency variable, which can significantly decrease the computational complexity in target envelope migration elimination. Then, FrFT is applied to accomplish the target motion parameter estimation after range migration alignment. Finally, a ground moving target is well focused after motion compensation. The effectiveness of the proposed algorithm is validated by both simulated and real SAR data.
AB - In this paper, 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). In this algorithm, a range compressed signal is initially transformed into the range frequency domain and then RFRT is proposed to directly compensate the range migration via multiplying the signal in the range frequency domain by its reversed data according to the equal interval sampling of range frequency variable, which can significantly decrease the computational complexity in target envelope migration elimination. Then, FrFT is applied to accomplish the target motion parameter estimation after range migration alignment. Finally, a ground moving target is well focused after motion compensation. The effectiveness of the proposed algorithm is validated by both simulated and real SAR data.
KW - Doppler ambiguity
KW - fractional Fourier transform (FrFT)
KW - motion parameter estimation
KW - range frequency reversal transform (RFRT)
KW - synthetic aperture radar (SAR)
UR - http://www.scopus.com/inward/record.url?scp=85069796027&partnerID=8YFLogxK
U2 - 10.1109/TGRS.2019.2899728
DO - 10.1109/TGRS.2019.2899728
M3 - Article
AN - SCOPUS:85069796027
SN - 0196-2892
VL - 57
SP - 5476
EP - 5492
JO - IEEE Transactions on Geoscience and Remote Sensing
JF - IEEE Transactions on Geoscience and Remote Sensing
IS - 8
M1 - 8681723
ER -