Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica
Ice motion is an essential element for accurately evaluating glacier mass balance. Interferometric synthetic aperture radar (InSAR) has been widely applied for monitoring ice motion with high precision and wide coverage in the Antarctic. However, the ionospheric effects can significantly impact InSA...
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ftdoajarticles:oai:doaj.org/article:8f3466df35e84dbab5e5332443af9a14 2023-05-15T14:05:02+02:00 Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica Yuanyuan Ma Zemin Wang Fei Li Shunlun Liu Jiachun An Bing Li Weifeng Ma 2022-01-01T00:00:00Z https://doi.org/10.3390/rs14030556 https://doaj.org/article/8f3466df35e84dbab5e5332443af9a14 EN eng MDPI AG https://www.mdpi.com/2072-4292/14/3/556 https://doaj.org/toc/2072-4292 doi:10.3390/rs14030556 2072-4292 https://doaj.org/article/8f3466df35e84dbab5e5332443af9a14 Remote Sensing, Vol 14, Iss 556, p 556 (2022) glacier mass balance SAR interferometry ice motion ionospheric effects reformulation of the split-spectrum method ionospheric correction Science Q article 2022 ftdoajarticles https://doi.org/10.3390/rs14030556 2022-12-31T14:43:31Z Ice motion is an essential element for accurately evaluating glacier mass balance. Interferometric synthetic aperture radar (InSAR) has been widely applied for monitoring ice motion with high precision and wide coverage in the Antarctic. However, the ionospheric effects can significantly impact InSAR-based ice-motion measurements. At low radar frequencies in particular, the ionospheric effects have been regarded as a serious source of noise in L-band SAR data. The split-spectrum method (SSM) is commonly used for correcting the ionospheric effects of the InSAR technique. However, it requires spatial filtering with the relatively large factors used to scale the sub-bands’ interferograms, which often results in an unwrapped phase error. In this paper, a reformulation of the split-spectrum method (RSSM) is introduced to correct the ionospheric effects in the Grove Mountains of East Antarctica, which have slow ice flow and frequent ionosphere changes. The results show that RSSM can effectively correct the ionospheric effects of InSAR-based ice-motion measurements. To evaluate the ability of ionospheric correction using RSSM, the result of ionospheric correction derived from SSM is compared with the results of RSSM. In addition, ionosphere-corrected ice motion is also compared with GPS and MEaSUREs. The results show that the ionosphere-corrected ice velocities are in good agreement with GPS observations and MEaSUREs. The average ice velocity from the InSAR time series is compared to that from MEaSUREs, and the average ionosphere-corrected ice velocity error reduces 43.9% in SSM and 51.1% in RSSM, respectively. The ionosphere-corrected ice velocity error is the most significant, reducing 86.9% in SSM and 90.4% in RSSM from 1 November 2007 to 19 December 2007. The results show that the ability of RSSM to correct ionospheric effects is slightly better than that of SSM. Therefore, we deduce that the RSSM offers a feasible way to correct ionospheric effects in InSAR-based ice-motion measurements in Antarctica. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Directory of Open Access Journals: DOAJ Articles Antarctic The Antarctic East Antarctica Grove Mountains ENVELOPE(75.000,75.000,-72.750,-72.750) Remote Sensing 14 3 556 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
glacier mass balance SAR interferometry ice motion ionospheric effects reformulation of the split-spectrum method ionospheric correction Science Q |
spellingShingle |
glacier mass balance SAR interferometry ice motion ionospheric effects reformulation of the split-spectrum method ionospheric correction Science Q Yuanyuan Ma Zemin Wang Fei Li Shunlun Liu Jiachun An Bing Li Weifeng Ma Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica |
topic_facet |
glacier mass balance SAR interferometry ice motion ionospheric effects reformulation of the split-spectrum method ionospheric correction Science Q |
description |
Ice motion is an essential element for accurately evaluating glacier mass balance. Interferometric synthetic aperture radar (InSAR) has been widely applied for monitoring ice motion with high precision and wide coverage in the Antarctic. However, the ionospheric effects can significantly impact InSAR-based ice-motion measurements. At low radar frequencies in particular, the ionospheric effects have been regarded as a serious source of noise in L-band SAR data. The split-spectrum method (SSM) is commonly used for correcting the ionospheric effects of the InSAR technique. However, it requires spatial filtering with the relatively large factors used to scale the sub-bands’ interferograms, which often results in an unwrapped phase error. In this paper, a reformulation of the split-spectrum method (RSSM) is introduced to correct the ionospheric effects in the Grove Mountains of East Antarctica, which have slow ice flow and frequent ionosphere changes. The results show that RSSM can effectively correct the ionospheric effects of InSAR-based ice-motion measurements. To evaluate the ability of ionospheric correction using RSSM, the result of ionospheric correction derived from SSM is compared with the results of RSSM. In addition, ionosphere-corrected ice motion is also compared with GPS and MEaSUREs. The results show that the ionosphere-corrected ice velocities are in good agreement with GPS observations and MEaSUREs. The average ice velocity from the InSAR time series is compared to that from MEaSUREs, and the average ionosphere-corrected ice velocity error reduces 43.9% in SSM and 51.1% in RSSM, respectively. The ionosphere-corrected ice velocity error is the most significant, reducing 86.9% in SSM and 90.4% in RSSM from 1 November 2007 to 19 December 2007. The results show that the ability of RSSM to correct ionospheric effects is slightly better than that of SSM. Therefore, we deduce that the RSSM offers a feasible way to correct ionospheric effects in InSAR-based ice-motion measurements in Antarctica. |
format |
Article in Journal/Newspaper |
author |
Yuanyuan Ma Zemin Wang Fei Li Shunlun Liu Jiachun An Bing Li Weifeng Ma |
author_facet |
Yuanyuan Ma Zemin Wang Fei Li Shunlun Liu Jiachun An Bing Li Weifeng Ma |
author_sort |
Yuanyuan Ma |
title |
Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica |
title_short |
Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica |
title_full |
Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica |
title_fullStr |
Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica |
title_full_unstemmed |
Ionospheric Correction of L-Band SAR Interferometry for Accurate Ice-Motion Measurements: A Case Study in the Grove Mountains Area, East Antarctica |
title_sort |
ionospheric correction of l-band sar interferometry for accurate ice-motion measurements: a case study in the grove mountains area, east antarctica |
publisher |
MDPI AG |
publishDate |
2022 |
url |
https://doi.org/10.3390/rs14030556 https://doaj.org/article/8f3466df35e84dbab5e5332443af9a14 |
long_lat |
ENVELOPE(75.000,75.000,-72.750,-72.750) |
geographic |
Antarctic The Antarctic East Antarctica Grove Mountains |
geographic_facet |
Antarctic The Antarctic East Antarctica Grove Mountains |
genre |
Antarc* Antarctic Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica |
op_source |
Remote Sensing, Vol 14, Iss 556, p 556 (2022) |
op_relation |
https://www.mdpi.com/2072-4292/14/3/556 https://doaj.org/toc/2072-4292 doi:10.3390/rs14030556 2072-4292 https://doaj.org/article/8f3466df35e84dbab5e5332443af9a14 |
op_doi |
https://doi.org/10.3390/rs14030556 |
container_title |
Remote Sensing |
container_volume |
14 |
container_issue |
3 |
container_start_page |
556 |
_version_ |
1766276665466421248 |