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

Liang, Cunren and Agram, Piyush and Simons, Mark and Fielding, Eric J. (2019) Ionospheric Correction of InSAR Time Series Analysis of C-band Sentinel-1 TOPS Data. IEEE Transactions on Geoscience and Remote Sensing, 57 (9). pp. 6755-6773. ISSN 0196-2892. doi:10.1109/tgrs.2019.2908494. https://resolver.caltech.edu/CaltechAUTHORS:20190926-153914557

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Abstract

The Copernicus Sentinel-1A/B satellites operating at C-band in terrain observation by progressive scans (TOPS) mode bring unprecedented opportunities for measuring large-scale tectonic motions using interferometric synthetic aperture radar (InSAR). Although 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 midlatitude 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. The application of the range split-spectrum method, despite some implementation challenges, largely removes ionospheric effects, and thus improves the InSAR time series analysis results.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1109/tgrs.2019.2908494DOIArticle
ORCID:
AuthorORCID
Liang, Cunren0000-0003-3938-426X
Simons, Mark0000-0003-1412-6395
Fielding, Eric J.0000-0002-6648-8067
Additional Information:© 2019 IEEE. Manuscript received December 11, 2018; revised February 20, 2019; accepted March 17, 2019. Date of publication May 6, 2019; date of current version August 27, 2019. This work was supported in part by NISAR Mission Science Team Project and in part by NASA Earth Surface and Interior focus area.
Funders:
Funding AgencyGrant Number
NASA Earth and Space Science FellowshipUNSPECIFIED
Issue or Number:9
DOI:10.1109/tgrs.2019.2908494
Record Number:CaltechAUTHORS:20190926-153914557
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20190926-153914557
Official Citation:C. Liang, P. Agram, M. Simons and E. J. Fielding, "Ionospheric Correction of InSAR Time Series Analysis of C-band Sentinel-1 TOPS Data," in IEEE Transactions on Geoscience and Remote Sensing, vol. 57, no. 9, pp. 6755-6773, Sept. 2019. doi: 10.1109/TGRS.2019.2908494
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98886
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:26 Sep 2019 22:46
Last Modified:16 Nov 2021 17:42

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