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This is a Preprint and has not been peer reviewed.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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Authors

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

Abstract

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.

DOI

https://doi.org/10.31223/osf.io/atxr7

Subjects

Earth Sciences, Geophysics and Seismology, Physical Sciences and Mathematics

Keywords

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

Dates

Published: 2019-01-18 04:42

Last Updated: 2020-04-05 19:37

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License

GNU Lesser General Public License (LGPL) 2.1

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