TY - GEN
T1 - A Modified Spaceborne High-squint SAR Imaging Algorithm based on Azimuth Nonlinear Chirp Scaling
AU - Zheng, Pengnan
AU - Liang, Yanzhen
AU - Ding, Zegang
AU - Wang, Yan
AU - Xu, Pei
AU - Li, Zhe
N1 - Publisher Copyright:
© 2020 IET Conference Proceedings. All rights reserved.
PY - 2020
Y1 - 2020
N2 - To process the spaceborne high-squint SAR data, the linear range cell migration correction (LRCMC) is conducted firstly. Although the target linear range cell migration (LRCM) is removed and the range-azimuth coupling of two-dimensional spectrum is reduced through LRCMC, it also causes the azimuth spatial variation of focusing parameters. The spatial variation of focusing parameters is caused by azimuth spatial variation of slant-range and equivalent velocity in spaceborne SAR system. However, the most existed imaging algorithms neglect the azimuth spatial-variant equivalent velocity, which will decrease the imaging quality. In this paper, the azimuth spatial variation of focusing parameters is analysed precisely. And a modified imaging algorithm based on azimuth nonlinear chirp scaling is proposed. Simulation of high-squint strip-map data verifies the accuracy of the proposed algorithm.
AB - To process the spaceborne high-squint SAR data, the linear range cell migration correction (LRCMC) is conducted firstly. Although the target linear range cell migration (LRCM) is removed and the range-azimuth coupling of two-dimensional spectrum is reduced through LRCMC, it also causes the azimuth spatial variation of focusing parameters. The spatial variation of focusing parameters is caused by azimuth spatial variation of slant-range and equivalent velocity in spaceborne SAR system. However, the most existed imaging algorithms neglect the azimuth spatial-variant equivalent velocity, which will decrease the imaging quality. In this paper, the azimuth spatial variation of focusing parameters is analysed precisely. And a modified imaging algorithm based on azimuth nonlinear chirp scaling is proposed. Simulation of high-squint strip-map data verifies the accuracy of the proposed algorithm.
KW - Azimuth Nonlinear Chirp Scaling (NCS)
KW - Azimuth spatial variation
KW - High-squint mode
KW - Synthetic Aperture Radar (SAR)
UR - http://www.scopus.com/inward/record.url?scp=85174648366&partnerID=8YFLogxK
U2 - 10.1049/icp.2021.0738
DO - 10.1049/icp.2021.0738
M3 - Conference contribution
AN - SCOPUS:85174648366
VL - 2020
SP - 999
EP - 1003
BT - IET Conference Proceedings
PB - Institution of Engineering and Technology
T2 - 5th IET International Radar Conference, IET IRC 2020
Y2 - 4 November 2020 through 6 November 2020
ER -