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
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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