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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

Abstract

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
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Li, YuanhaoDelft University of TechnologyUNSPECIFIED
Lopez-Dekker, PacoDelft University of TechnologyUNSPECIFIED
Mulder, GertDelft University of TechnologyUNSPECIFIED
Iannini, LorenzoDelft University of TechnologyUNSPECIFIED
Prats-Iraola, PauPau.Prats (at) dlr.dehttps://orcid.org/0000-0002-7583-2309
Date:24 August 2021
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI:10.1109/TGRS.2021.3105007
Page Range:pp. 1-18
Publisher:IEEE - Institute of Electrical and Electronics Engineers
ISSN:0196-2892
Status:Published
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:16 Nov 2021 12:52

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