Ionospheric correction of ALOS‐2 full‐aperture ScanSAR interferometric data for surface deformation measurement in Beijing
Autor: | Shuang Zhao, Jiaqi Ning, Jili Wang, Robert Wang, Bowen Zhang |
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Rok vydání: | 2019 |
Předmět: |
010504 meteorology & atmospheric sciences
nonlocal filtering 0211 other engineering and technologies differential interferograms 02 engineering and technology radar interferometry geographical information 01 natural sciences ScanSAR mode D-InSAR Interferometric synthetic aperture radar AD 2015 10 to 2017 02 ionospheric disturbance phase screen ALOS-2 full-aperture ScanSAR interferometric data spatial deformation distribution ionospheric distortion extraction method General Engineering imaging modes PS-InSAR radar imaging October 2015–February Interferometry spaceborne SAR systems Beijing split range-spectrum technique October 2016 Sentinel Tops mode images low frequency Geology synthetic aperture radar Synthetic aperture radar L band Aperture Energy Engineering and Power Technology deformation trend surface deformation measurement spaceborne radar ground deformation Distortion Radar imaging Coherence (signal processing) 021101 geological & geomatics engineering 0105 earth and related environmental sciences Remote sensing full-aperture ScanSAR images ionospheric extraction persistent scatterer interferometric synthetic aperture radar technique L-band differential interferometric synthetic aperture radar technique lcsh:TA1-2040 ionospheric techniques ionospheric correction ionospheric disturbances lcsh:Engineering (General). Civil engineering (General) ALOS-2 ScanSAR images Software |
Zdroj: | The Journal of Engineering (2019) |
ISSN: | 2051-3305 |
DOI: | 10.1049/joe.2019.0331 |
Popis: | Ionospheric disturbance is one of the most serious factors that limit the accuracy of deformation measurement of interferometric synthetic aperture radar (InSAR) especially for spaceborne SAR systems in low frequency such as L-band. Especially in imaging modes with a large coverage, ScanSAR mode for example, ionospheric disturbance phase screen almost submerges other useful geographical information. In this study, two ALOS-2 (L-band) full-aperture ScanSAR images (October 2015 and October 2016) are used to study ground deformation in Beijing from 2015 to 2016. The split range-spectrum technique is adopted to extract ionospheric distortion. The authors splice the differential interferograms of adjacent subswaths by resampling them to perform the overall ionospheric extraction. Also non-local filtering is used to improve the coherence of interferograms. Spatial deformation distribution that was obtained by differential interferometric synthetic aperture radar (D-InSAR) technique using the two ALOS-2 ScanSAR images is highly consistent with the result obtained by persistent scatterer interferometric synthetic aperture radar (PS-InSAR) technique using Sentinel Tops mode images (October 2015–February 2017). The comparison results show the effectiveness of the ionospheric distortion extraction method used in this study. Moreover, the spatial distribution is also highly consistent with the results before 2014, which means that the deformation trend in Beijing continues. |
Databáze: | OpenAIRE |
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