Improving 2D resolution in geosynchronous SAR via spatial spectrum synthesis: method and verification

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dc.contributor.authorChen, Xinyan
dc.contributor.authorChen, Zhiyang
dc.contributor.authorLi, Yuanhao
dc.contributor.authorHu, Cheng
dc.contributor.authorDong, Xichao
dc.contributor.authorHobbs, Stephen
dc.date.accessioned2024-03-15T16:25:15Z
dc.date.available2024-03-15T16:25:15Z
dc.date.issued2024-02-01
dc.description.abstractGeosynchronous synthetic aperture radar (GEO SAR) has the advantages of a short revisit time and a large beam footprint. Enhancing spatial resolution has become a hotspot in spaceborne SAR research areas. The existing designs of GEO SAR suffer from the problem of poor resolution (greater than 10 m) and cause low-precision observation in urban areas. First time, this article points out that GEO SAR has the ability to improve the two-dimensional (2-D) resolution of SAR images by spatial spectrum synthesis based on 2-D baselines, and proposes models and a signal processing method involved in GEO SAR spectrum synthesis. The 2-D spatial baselines of GEO SAR are analyzed and evaluated first based on satellite software and real ephemeris from Beidou Inclined Geosynchronous Orbit (IGSO) navigation satellites to demonstrate the potential of 2-D resolution improvement. Then the analytical models of the spectral shape and relative spectral shift between GEO SAR images are derived. Furthermore, a 2-D spectrum synthesis algorithm suitable for GEO SAR is also proposed, where we use deramping operation instead of the traditional spectrum shifting process. Nonideal factors are considered in the processing of synthesized. In addition, performances of the proposed algorithm, including the resolution improvement factor, the amplitude fluctuation, and the critical baseline, are constructed. Finally, computer simulations and equivalent experiments based on Beidou IGSO navigation satellites verify the proposed algorithm.en_UK
dc.identifier.citationChen X, Chen Z, Li Y, et al., (2024) Improving 2D resolution in geosynchronous SAR via spatial spectrum synthesis: method and verification. IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, Volume 17, February 2024, pp. 5847-5863en_UK
dc.identifier.issn1939-1404
dc.identifier.urihttps://doi.org/10.1109/JSTARS.2024.3361165
dc.identifier.urihttps://dspace.lib.cranfield.ac.uk/handle/1826/21014
dc.language.isoen_UKen_UK
dc.publisherIEEEen_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectGeosynchronous synthetic aperture radar (GEO SAR)en_UK
dc.subjectresolution improvementen_UK
dc.subjectspatial spectrum synthesisen_UK
dc.subjecttwo-dimensional (2-D) spatial baselineen_UK
dc.titleImproving 2D resolution in geosynchronous SAR via spatial spectrum synthesis: method and verificationen_UK
dc.typeArticleen_UK
dcterms.dateAccepted2024-01-17

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