High-speed maneuvering platforms squint beam-steering SAR imaging without subaperture

Bowen Bie; Guang Cai Sun; Xiang Gen Xia; Mengdao Xing; Liang Guo; Zheng Bao

doi:10.1109/TGRS.2019.2909729

High-speed maneuvering platforms squint beam-steering SAR imaging without subaperture

Bowen Bie, Guang Cai Sun^*, Xiang Gen Xia, Mengdao Xing, Liang Guo, Zheng Bao

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

This paper investigates the imaging problems in squint beam-steering synthetic aperture radar (SBS-SAR) mounted on high-speed platforms with constant acceleration. The cross-range-dependent range cell migration (RCM) is compensated by keystone transform (KT) and time domain RCM correction (RCMC). By derotation and phase compensation, the KT of Doppler folded signal is achieved without zero-padding. For azimuth processing, the signal is reconstructed by the nonlinear phase and range-dependent derotation. Then, the space-variant (SV) Doppler chirp rate is corrected by time domain azimuth nonlinear chirp scaling (ANCS). After frequency domain matched filtering, the full aperture signal is focused in the 2-D time domain. The algorithm is validated by simulated SAR data, including the evaluation of RCMC with KT, geometric correction, and the focusing performance.

Original language	English
Article number	8701477
Pages (from-to)	6974-6985
Number of pages	12
Journal	IEEE Transactions on Geoscience and Remote Sensing
Volume	57
Issue number	9
DOIs	https://doi.org/10.1109/TGRS.2019.2909729
Publication status	Published - Sept 2019
Externally published	Yes

Keywords

Azimuth nonlinear chip scaling (ANCS)
constant acceleration
keystone transform (KT)
squint beam steering (SBS)

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10.1109/TGRS.2019.2909729

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title = "High-speed maneuvering platforms squint beam-steering SAR imaging without subaperture",

abstract = "This paper investigates the imaging problems in squint beam-steering synthetic aperture radar (SBS-SAR) mounted on high-speed platforms with constant acceleration. The cross-range-dependent range cell migration (RCM) is compensated by keystone transform (KT) and time domain RCM correction (RCMC). By derotation and phase compensation, the KT of Doppler folded signal is achieved without zero-padding. For azimuth processing, the signal is reconstructed by the nonlinear phase and range-dependent derotation. Then, the space-variant (SV) Doppler chirp rate is corrected by time domain azimuth nonlinear chirp scaling (ANCS). After frequency domain matched filtering, the full aperture signal is focused in the 2-D time domain. The algorithm is validated by simulated SAR data, including the evaluation of RCMC with KT, geometric correction, and the focusing performance.",

keywords = "Azimuth nonlinear chip scaling (ANCS), constant acceleration, keystone transform (KT), squint beam steering (SBS)",

author = "Bowen Bie and Sun, {Guang Cai} and Xia, {Xiang Gen} and Mengdao Xing and Liang Guo and Zheng Bao",

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T1 - High-speed maneuvering platforms squint beam-steering SAR imaging without subaperture

AU - Bie, Bowen

AU - Sun, Guang Cai

AU - Xia, Xiang Gen

AU - Xing, Mengdao

AU - Guo, Liang

AU - Bao, Zheng

PY - 2019/9

Y1 - 2019/9

N2 - This paper investigates the imaging problems in squint beam-steering synthetic aperture radar (SBS-SAR) mounted on high-speed platforms with constant acceleration. The cross-range-dependent range cell migration (RCM) is compensated by keystone transform (KT) and time domain RCM correction (RCMC). By derotation and phase compensation, the KT of Doppler folded signal is achieved without zero-padding. For azimuth processing, the signal is reconstructed by the nonlinear phase and range-dependent derotation. Then, the space-variant (SV) Doppler chirp rate is corrected by time domain azimuth nonlinear chirp scaling (ANCS). After frequency domain matched filtering, the full aperture signal is focused in the 2-D time domain. The algorithm is validated by simulated SAR data, including the evaluation of RCMC with KT, geometric correction, and the focusing performance.

AB - This paper investigates the imaging problems in squint beam-steering synthetic aperture radar (SBS-SAR) mounted on high-speed platforms with constant acceleration. The cross-range-dependent range cell migration (RCM) is compensated by keystone transform (KT) and time domain RCM correction (RCMC). By derotation and phase compensation, the KT of Doppler folded signal is achieved without zero-padding. For azimuth processing, the signal is reconstructed by the nonlinear phase and range-dependent derotation. Then, the space-variant (SV) Doppler chirp rate is corrected by time domain azimuth nonlinear chirp scaling (ANCS). After frequency domain matched filtering, the full aperture signal is focused in the 2-D time domain. The algorithm is validated by simulated SAR data, including the evaluation of RCMC with KT, geometric correction, and the focusing performance.

KW - Azimuth nonlinear chip scaling (ANCS)

KW - constant acceleration

KW - keystone transform (KT)

KW - squint beam steering (SBS)

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SN - 0196-2892

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JO - IEEE Transactions on Geoscience and Remote Sensing

JF - IEEE Transactions on Geoscience and Remote Sensing

IS - 9

M1 - 8701477

ER -

High-speed maneuvering platforms squint beam-steering SAR imaging without subaperture

Abstract

Keywords

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