Measuring Azimuth Deformation With L-Band ALOS-2 ScanSAR Interferometry

This is a Preprint and has not been peer reviewed. The published version of this Preprint is available: https://doi.org/10.1109/TGRS.2017.2653186.

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Authors

Cunren Liang , Eric Jameson Fielding 

Abstract

We analyze the methods for measuring azimuth deformation with the L-band Advanced Land Observing Satellite-2 (ALOS-2) scanning synthetic aperture radar (ScanSAR) interferometry. To implement the methods, we extract focused bursts from the ALOS-2 full-aperture product, which is the only product available for ScanSAR interferometry at present. The extracted bursts are properly processed to measure azimuth deformation using interferometric phase. We apply the range split-spectrum method to ScanSAR to estimate the differential ionospheric phase of the interferogram, and take the azimuth derivative of the differential ionospheric phase to mitigate the relative azimuth shift caused by ionosphere. For the first time, azimuth deformation of a large earthquake (April 25, 2015 Nepal earthquake) is nearly completely measured by the L-band ScanSAR interferometry with moderate precision. The result is validated by the azimuth deformation measured by incoherent cross correlation using a pair of high-resolution RADARSAT-2 images. In addition to the final azimuth deformation, we show the possibility of processing full-aperture ScanSAR product using a burst-by-burst approach to form regular interferograms. We also show the recent strong large-scale ionospheric effects on the L-band ALOS-2 ScanSAR interferograms. Other possible applications of this paper include measuring the movement of glaciers.

DOI

https://doi.org/10.31223/osf.io/5sqgn

Subjects

Aerospace Engineering, Civil and Environmental Engineering, Computational Engineering, Computer Engineering, Earth Sciences, Electrical and Computer Engineering, Engineering, Geology, Geomorphology, Geophysics and Seismology, Glaciology, Hydrology, Mining Engineering, Other Earth Sciences, Physical Sciences and Mathematics, Signal Processing, Tectonics and Structure, Volcanology

Keywords

remote sensing, Seismology, Geology, Geophysics, volcanology, civil engineering, hydrology, InSAR, Sentinel-1, earthquake, Glaciology, Tectonics, geomorphology, ALOS, ALOS-2, ALOS-4, azimuth deformation, deformation, geomatics, interferometry, ionosphere, ionosphere correction, L-band, NISAR, ScanSAR, Sentinel, Sentinel-1A, Sentinel-1B, synthetic aperture radar, along-track deformation, SAR, full aperture

Dates

Published: 2020-04-06 12:27

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License

GNU Lesser General Public License (LGPL) 2.1

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