Ionospheric Correction of InSAR Time Series Analysis of C-band Sentinel-1 TOPS Data

This is a Preprint and has not been peer reviewed. This is version 4 of this Preprint.


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Cunren Liang, Piyush Agram, Mark Simons, Eric Jameson Fielding 


The Copernicus Sentinel-1A/B satellites operating at C-band in TOPS mode bring unprecedented opportunities for measuring large-scale tectonic motions using interferometric synthetic aperture radar. However, while the ionospheric effects are only about one sixteenth of those at L-band, the measurement accuracy might still be degraded by long-wavelength signals due to the ionosphere. We implement the range split-spectrum method for correcting ionospheric effects in InSAR with C-band Sentinel-1 TOPS data. We perform InSAR time series analysis and evaluate these ionospheric effects using data acquired on both ascending (dusk-side of the Sentinel-1 dawn-dusk orbit) and descending (dawn-side) tracks over representative mid-latitude and low-latitude (geomagnetic latitude) areas. We find that the ionospheric effects are very strong for data acquired at low-latitudes on ascending tracks. For other cases, ionospheric effects are not strong or even negligible. Application of the range split-spectrum method, despite some implementation challenges, largely removes ionospheric effects and thus improves the InSAR time series analysis results.



Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics


time series analysis, Sentinel-1, , ionosphere, TOPS, range split-spectrum method, Synthetic aperture radar interferometry (InSAR), tectonic motion


Published: 2019-01-18 04:42

Last Updated: 2020-04-05 19:37

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GNU Lesser General Public License (LGPL) 2.1

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