A Modified CSA Based on Joint Time-Doppler Resampling for MEO SAR Stripmap Mode

Wenkang Liu; Guang Cai Sun; Xiang Gen Xia; Jianlai Chen; Liang Guo; Mengdao Xing

doi:10.1109/TGRS.2018.2802545

A Modified CSA Based on Joint Time-Doppler Resampling for MEO SAR Stripmap Mode

Wenkang Liu^*, Guang Cai Sun, Xiang Gen Xia, Jianlai Chen, Liang Guo, Mengdao Xing

^*Corresponding author for this work

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

34 Citations (Scopus)

Abstract

Image formation of large scenes is still challenging in medium-earth-orbit (MEO) synthetic aperture radar (SAR) due to the existence of severe 2-D space variance. In this paper, the properties of space variance are analyzed in detail, and then a variable-coefficient fourth-order range model is adopted to model the space-variant range history of every target in a large scene accurately. A method integrating a modified chirp scaling algorithm with joint time-Doppler resampling is proposed to address the range-variant range cell migration, as well as the azimuth-variant frequency-modulation rate and higher order Doppler parameters. The computational burden and alternative implementation approaches are also discussed. Finally, processing of simulated data for MEO SAR with 2-m resolution is presented to validate the proposed algorithm.

Original language	English
Pages (from-to)	3573-3586
Number of pages	14
Journal	IEEE Transactions on Geoscience and Remote Sensing
Volume	56
Issue number	6
DOIs	https://doi.org/10.1109/TGRS.2018.2802545
Publication status	Published - Jun 2018
Externally published	Yes

Keywords

2-D space variance
azimuth resampling
chirp scaling (CS)
medium-earth-orbit (MEO) synthetic aperture radar (SAR)
stripmap mode

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10.1109/TGRS.2018.2802545

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title = "A Modified CSA Based on Joint Time-Doppler Resampling for MEO SAR Stripmap Mode",

abstract = "Image formation of large scenes is still challenging in medium-earth-orbit (MEO) synthetic aperture radar (SAR) due to the existence of severe 2-D space variance. In this paper, the properties of space variance are analyzed in detail, and then a variable-coefficient fourth-order range model is adopted to model the space-variant range history of every target in a large scene accurately. A method integrating a modified chirp scaling algorithm with joint time-Doppler resampling is proposed to address the range-variant range cell migration, as well as the azimuth-variant frequency-modulation rate and higher order Doppler parameters. The computational burden and alternative implementation approaches are also discussed. Finally, processing of simulated data for MEO SAR with 2-m resolution is presented to validate the proposed algorithm.",

keywords = "2-D space variance, azimuth resampling, chirp scaling (CS), medium-earth-orbit (MEO) synthetic aperture radar (SAR), stripmap mode",

author = "Wenkang Liu and Sun, {Guang Cai} and Xia, {Xiang Gen} and Jianlai Chen and Liang Guo and Mengdao Xing",

note = "Publisher Copyright: {\textcopyright} 1980-2012 IEEE.",

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doi = "10.1109/TGRS.2018.2802545",

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AU - Liu, Wenkang

AU - Sun, Guang Cai

AU - Xia, Xiang Gen

AU - Chen, Jianlai

AU - Guo, Liang

AU - Xing, Mengdao

PY - 2018/6

Y1 - 2018/6

N2 - Image formation of large scenes is still challenging in medium-earth-orbit (MEO) synthetic aperture radar (SAR) due to the existence of severe 2-D space variance. In this paper, the properties of space variance are analyzed in detail, and then a variable-coefficient fourth-order range model is adopted to model the space-variant range history of every target in a large scene accurately. A method integrating a modified chirp scaling algorithm with joint time-Doppler resampling is proposed to address the range-variant range cell migration, as well as the azimuth-variant frequency-modulation rate and higher order Doppler parameters. The computational burden and alternative implementation approaches are also discussed. Finally, processing of simulated data for MEO SAR with 2-m resolution is presented to validate the proposed algorithm.

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KW - 2-D space variance

KW - azimuth resampling

KW - chirp scaling (CS)

KW - medium-earth-orbit (MEO) synthetic aperture radar (SAR)

KW - stripmap mode

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A Modified CSA Based on Joint Time-Doppler Resampling for MEO SAR Stripmap Mode

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Keywords

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