A Modified Spaceborne High-squint SAR Imaging Algorithm based on Azimuth Nonlinear Chirp Scaling

Pengnan Zheng; Yanzhen Liang; Zegang Ding; Yan Wang; Pei Xu; Zhe Li

doi:10.1049/icp.2021.0738

A Modified Spaceborne High-squint SAR Imaging Algorithm based on Azimuth Nonlinear Chirp Scaling

Pengnan Zheng
, Yanzhen Liang
, Zegang Ding^*
, Yan Wang
, Pei Xu
, Zhe Li

^*Corresponding author for this work

School of Information and Electronics

Beijing Institute of Technology
China National Space Administration

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

1 Citation (Scopus)

Abstract

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.

Original language	English
Title of host publication	IET Conference Proceedings
Publisher	Institution of Engineering and Technology
Pages	999-1003
Number of pages	5
Volume	2020
Edition	9
ISBN (Electronic)	9781839535406
DOIs	https://doi.org/10.1049/icp.2021.0738
Publication status	Published - 2020
Event	5th IET International Radar Conference, IET IRC 2020 - Virtual, Online Duration: 4 Nov 2020 → 6 Nov 2020

Conference

Conference	5th IET International Radar Conference, IET IRC 2020
City	Virtual, Online
Period	4/11/20 → 6/11/20

Keywords

Azimuth Nonlinear Chirp Scaling (NCS)
Azimuth spatial variation
High-squint mode
Synthetic Aperture Radar (SAR)

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10.1049/icp.2021.0738

Cite this

@inproceedings{e3aa210fd51a41cb8c70ef9448e41b5e,

title = "A Modified Spaceborne High-squint SAR Imaging Algorithm based on Azimuth Nonlinear Chirp Scaling",

abstract = "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.",

keywords = "Azimuth Nonlinear Chirp Scaling (NCS), Azimuth spatial variation, High-squint mode, Synthetic Aperture Radar (SAR)",

author = "Pengnan Zheng and Yanzhen Liang and Zegang Ding and Yan Wang and Pei Xu and Zhe Li",

note = "Publisher Copyright: {\textcopyright} 2020 IET Conference Proceedings. All rights reserved.; 5th IET International Radar Conference, IET IRC 2020 ; Conference date: 04-11-2020 Through 06-11-2020",

year = "2020",

doi = "10.1049/icp.2021.0738",

language = "English",

volume = "2020",

pages = "999--1003",

booktitle = "IET Conference Proceedings",

publisher = "Institution of Engineering and Technology",

address = "United Kingdom",

edition = "9",

}

Zheng, P, Liang, Y, Ding, Z , Wang, Y, Xu, P & Li, Z 2020, A Modified Spaceborne High-squint SAR Imaging Algorithm based on Azimuth Nonlinear Chirp Scaling. in IET Conference Proceedings. 9 edn, vol. 2020, Institution of Engineering and Technology, pp. 999-1003, 5th IET International Radar Conference, IET IRC 2020, Virtual, Online, 4/11/20. https://doi.org/10.1049/icp.2021.0738

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

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 - https://www.scopus.com/pages/publications/85174648366

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 -

A Modified Spaceborne High-squint SAR Imaging Algorithm based on Azimuth Nonlinear Chirp Scaling

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Keywords

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