Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR

Scan-on-receive (SCORE) digital beamforming (DBF) in elevation can significantly improve the signal-to-noise ratio (SNR) and suppress range ambiguities in spaceborne synthetic aperture radar (SAR). It has been identified as one of the important methods to obtain high-resolution wide-swath (HRWS) SAR...

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Autores principales:	Wei Xu, Qi Yu, Chonghua Fang, Pingping Huang, Weixian Tan, Yaolong Qi
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	digital beamforming (DBF) high-resolution wide swath (HRWS) scan-on-receive (SCORE) synthetic aperture radar (SAR) Science Q
Acceso en línea:	https://doaj.org/article/35656961723144e4b628c710ee091afb
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spelling	oai:doaj.org-article:35656961723144e4b628c710ee091afb2021-11-11T18:54:31ZOnboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR10.3390/rs132143542072-4292https://doaj.org/article/35656961723144e4b628c710ee091afb2021-10-01T00:00:00Zhttps://www.mdpi.com/2072-4292/13/21/4354https://doaj.org/toc/2072-4292Scan-on-receive (SCORE) digital beamforming (DBF) in elevation can significantly improve the signal-to-noise ratio (SNR) and suppress range ambiguities in spaceborne synthetic aperture radar (SAR). It has been identified as one of the important methods to obtain high-resolution wide-swath (HRWS) SAR images. However, with the improvement of geometric resolution and swath width, the residual pulse extension loss (PEL) due to the long pulse duration in the conventional spaceborne onboard DBF processor must be considered and reduced. In this paper, according to the imaging geometry of the spaceborne DBF SAR system, the reason for the large attenuation of the receiving gain at the edge of the wide swath is analyzed, and two improved onboard DBF methods to mitigate the receive gain loss are given and analyzed. Taking account of both the advantages and drawbacks of the two improved DBF methods presented, a novel onboard DBF processor with multi-frequency and multi-group time delays in HRWS SAR is proposed. Compared with the DBF processor only with multi-group time delays, the downlink data rate was clearly reduced, while focusing performance degradation due to phase and amplitude errors between different frequency bands could be mitigated compared with the DBF processor only with multi-frequency time delays. The simulation results of both point and distributed targets validate the proposed DBF processor.Wei XuQi YuChonghua FangPingping HuangWeixian TanYaolong QiMDPI AGarticledigital beamforming (DBF)high-resolution wide swath (HRWS)scan-on-receive (SCORE)synthetic aperture radar (SAR)ScienceQENRemote Sensing, Vol 13, Iss 4354, p 4354 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	digital beamforming (DBF) high-resolution wide swath (HRWS) scan-on-receive (SCORE) synthetic aperture radar (SAR) Science Q
spellingShingle	digital beamforming (DBF) high-resolution wide swath (HRWS) scan-on-receive (SCORE) synthetic aperture radar (SAR) Science Q Wei Xu Qi Yu Chonghua Fang Pingping Huang Weixian Tan Yaolong Qi Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR
description	Scan-on-receive (SCORE) digital beamforming (DBF) in elevation can significantly improve the signal-to-noise ratio (SNR) and suppress range ambiguities in spaceborne synthetic aperture radar (SAR). It has been identified as one of the important methods to obtain high-resolution wide-swath (HRWS) SAR images. However, with the improvement of geometric resolution and swath width, the residual pulse extension loss (PEL) due to the long pulse duration in the conventional spaceborne onboard DBF processor must be considered and reduced. In this paper, according to the imaging geometry of the spaceborne DBF SAR system, the reason for the large attenuation of the receiving gain at the edge of the wide swath is analyzed, and two improved onboard DBF methods to mitigate the receive gain loss are given and analyzed. Taking account of both the advantages and drawbacks of the two improved DBF methods presented, a novel onboard DBF processor with multi-frequency and multi-group time delays in HRWS SAR is proposed. Compared with the DBF processor only with multi-group time delays, the downlink data rate was clearly reduced, while focusing performance degradation due to phase and amplitude errors between different frequency bands could be mitigated compared with the DBF processor only with multi-frequency time delays. The simulation results of both point and distributed targets validate the proposed DBF processor.
format	article
author	Wei Xu Qi Yu Chonghua Fang Pingping Huang Weixian Tan Yaolong Qi
author_facet	Wei Xu Qi Yu Chonghua Fang Pingping Huang Weixian Tan Yaolong Qi
author_sort	Wei Xu
title	Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR
title_short	Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR
title_full	Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR
title_fullStr	Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR
title_full_unstemmed	Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR
title_sort	onboard digital beamformer with multi-frequency and multi-group time delays for high-resolution wide-swath sar
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/35656961723144e4b628c710ee091afb
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Onboard Digital Beamformer with Multi-Frequency and Multi-Group Time Delays for High-Resolution Wide-Swath SAR

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