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Differential Tropospheric Delay Estimation by Simultaneous Multi-Angle Repeat-Pass InSAR

Li, Yuanhao and Lopez-Dekker, Paco and Mulder, Gert and Iannini, Lorenzo and Prats-Iraola, Pau (2021) Differential Tropospheric Delay Estimation by Simultaneous Multi-Angle Repeat-Pass InSAR. IEEE Transactions on Geoscience and Remote Sensing, pp. 1-18. IEEE - Institute of Electrical and Electronics Engineers. doi: 10.1109/TGRS.2021.3105007. ISSN 0196-2892.

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Official URL: http://www.grss-ieee.org/menu.taf?menu=publications&detail=tgars


Tropospheric delays are one of the main contributors to the interferometric phase in synthetic aperture radar (SAR) interferometry. When the phase contributions from surface deformation, topography, and ionospheric delays are negligible or known, the interferogram can be used to estimate the differential tropospheric delay (DTD), which can help to improve tropospheric delay predictions from weather models and in situ measurements. In conventional repeat-pass interferometric SAR (InSAR), however, the estimation of the DTD can still be significantly hindered by baseline errors. In addition, a single interferogram provides only relative DTDs, as the delays can be retrieved up to an unknown offset. To address such issues, this article presents a method for the estimation of DTDs on large scales by using repeat-pass simultaneous multi-angle SAR systems. Complementary simultaneous observations of the correlated troposphere from multiple angles are used to retrieve estimates of the absolute DTD and, at the same time, to mitigate the effect of baseline knowledge errors. Finally, a performance evaluation is presented for the Harmony Earth Explorer 10 candidate mission. A centimeter-level absolute accuracy and a submillimeter-level relative accuracy of the DTD estimation are achieved under the multistatic Harmony case when at least one companion satellite has an inter-satellite distance longer than 300 km to provide enough sensitivity.

Item URL in elib:https://elib.dlr.de/145735/
Document Type:Article
Additional Information:©2021 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE
Title:Differential Tropospheric Delay Estimation by Simultaneous Multi-Angle Repeat-Pass InSAR
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Li, YuanhaoDelft University of TechnologyUNSPECIFIEDUNSPECIFIED
Lopez-Dekker, PacoDelft University of TechnologyUNSPECIFIEDUNSPECIFIED
Mulder, GertDelft University of TechnologyUNSPECIFIEDUNSPECIFIED
Iannini, LorenzoDelft University of TechnologyUNSPECIFIEDUNSPECIFIED
Prats-Iraola, PauUNSPECIFIEDhttps://orcid.org/0000-0002-7583-2309UNSPECIFIED
Date:24 August 2021
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 1-18
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Interferometric phase error, interferometric synthetic aperture radar (InSAR), multi-angle observation system, synthetic aperture radar (SAR), troposphere
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Aircraft SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Deposited By: Prats, Dr. Pau
Deposited On:16 Nov 2021 12:52
Last Modified:22 Feb 2024 13:02

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