An azimuth-dependent phase gradient autofocus (APGA) algorithm for airborne/stationary BiSAR imagery

Song Zhou; Mengdao Xing; Xiang Gen Xia; Yachao Li; Lei Zhang; Zheng Bao

doi:10.1109/LGRS.2013.2237749

An azimuth-dependent phase gradient autofocus (APGA) algorithm for airborne/stationary BiSAR imagery

Song Zhou, Mengdao Xing, Xiang Gen Xia, Yachao Li, Lei Zhang, Zheng Bao

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

31 Citations (Scopus)

Abstract

In airborne/stationary bistatic-synthetic-aperture-radar imaging, translational invariance was no longer valid. After range cell migration correction, the range-compressed signal under the same range gate exhibited azimuth-dependent FM rates that made the motion-induced phase error difficult to separate from the echoes. To solve this problem, an azimuth-dependent phase gradient autofocus (PGA) algorithm was proposed. Different from the conventional PGA, the residual quadratic phase arising from the azimuth-dependent FM rates was additionally estimated and compensated. As the influence of the azimuth-dependent FM rates was greatly reduced, a phase gradient estimator was subsequently applied for accurate phase error retrieval. Acquired raw data were analyzed to verify the proposed algorithm.

Original language	English
Article number	6471182
Pages (from-to)	1290-1294
Number of pages	5
Journal	IEEE Geoscience and Remote Sensing Letters
Volume	10
Issue number	6
DOIs	https://doi.org/10.1109/LGRS.2013.2237749
Publication status	Published - 2013
Externally published	Yes

Keywords

Airborne/stationary (A/S) configuration
azimuth-dependent phase gradient autofocus (PGA) (APGA) algorithm
bistatic synthetic aperture radar (SAR) (BiSAR)
residual quadratic phase (RQP)

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10.1109/LGRS.2013.2237749

Cite this

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abstract = "In airborne/stationary bistatic-synthetic-aperture-radar imaging, translational invariance was no longer valid. After range cell migration correction, the range-compressed signal under the same range gate exhibited azimuth-dependent FM rates that made the motion-induced phase error difficult to separate from the echoes. To solve this problem, an azimuth-dependent phase gradient autofocus (PGA) algorithm was proposed. Different from the conventional PGA, the residual quadratic phase arising from the azimuth-dependent FM rates was additionally estimated and compensated. As the influence of the azimuth-dependent FM rates was greatly reduced, a phase gradient estimator was subsequently applied for accurate phase error retrieval. Acquired raw data were analyzed to verify the proposed algorithm.",

keywords = "Airborne/stationary (A/S) configuration, azimuth-dependent phase gradient autofocus (PGA) (APGA) algorithm, bistatic synthetic aperture radar (SAR) (BiSAR), residual quadratic phase (RQP)",

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T1 - An azimuth-dependent phase gradient autofocus (APGA) algorithm for airborne/stationary BiSAR imagery

AU - Zhou, Song

AU - Xing, Mengdao

AU - Xia, Xiang Gen

AU - Li, Yachao

AU - Zhang, Lei

AU - Bao, Zheng

PY - 2013

Y1 - 2013

N2 - In airborne/stationary bistatic-synthetic-aperture-radar imaging, translational invariance was no longer valid. After range cell migration correction, the range-compressed signal under the same range gate exhibited azimuth-dependent FM rates that made the motion-induced phase error difficult to separate from the echoes. To solve this problem, an azimuth-dependent phase gradient autofocus (PGA) algorithm was proposed. Different from the conventional PGA, the residual quadratic phase arising from the azimuth-dependent FM rates was additionally estimated and compensated. As the influence of the azimuth-dependent FM rates was greatly reduced, a phase gradient estimator was subsequently applied for accurate phase error retrieval. Acquired raw data were analyzed to verify the proposed algorithm.

AB - In airborne/stationary bistatic-synthetic-aperture-radar imaging, translational invariance was no longer valid. After range cell migration correction, the range-compressed signal under the same range gate exhibited azimuth-dependent FM rates that made the motion-induced phase error difficult to separate from the echoes. To solve this problem, an azimuth-dependent phase gradient autofocus (PGA) algorithm was proposed. Different from the conventional PGA, the residual quadratic phase arising from the azimuth-dependent FM rates was additionally estimated and compensated. As the influence of the azimuth-dependent FM rates was greatly reduced, a phase gradient estimator was subsequently applied for accurate phase error retrieval. Acquired raw data were analyzed to verify the proposed algorithm.

KW - Airborne/stationary (A/S) configuration

KW - azimuth-dependent phase gradient autofocus (PGA) (APGA) algorithm

KW - bistatic synthetic aperture radar (SAR) (BiSAR)

KW - residual quadratic phase (RQP)

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JO - IEEE Geoscience and Remote Sensing Letters

JF - IEEE Geoscience and Remote Sensing Letters

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M1 - 6471182

ER -

An azimuth-dependent phase gradient autofocus (APGA) algorithm for airborne/stationary BiSAR imagery

Abstract

Keywords

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