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Mitigation of tropospheric delay in SAR and InSAR using NWP data: its validation and application examples

Cong, Xiao Ying and Balss, Ulrich and Rodriguez Gonzalez, Fernando and Eineder, Michael (2019) Mitigation of tropospheric delay in SAR and InSAR using NWP data: its validation and application examples. In: Ten Years of TerraSAR-X - Scientific Results (ISBN = 978-3-03897-724-7) Miltidisciplinary Digital Publishing Institute (MPDI). pp. 333-354. ISBN ISBN 978-3-03897-724-7 (pbk); ISBN 978-3-03897-725-4 (PDF). ISSN 2072-4292

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Abstract

The neutral atmospheric delay has a great impact on SAR absolute ranging and on differential interferometry. In this paper, we demonstrate its effective mitigation by means of the direction integration method using two products from the European Centre for Medium-Range Weather Forecast: ERA-Interim and operational data. Firstly, we shortly review the modeling of the neutral atmospheric delay for the direct integration method, focusing on the different refractivity models and constant coefficients available. Secondly, a thorough validation of the method is performed using two approaches. In the first approach, NWP derived Zenith Path Delay (ZPD) is validated against ZPD from permanent GNSS stations on a global scale, demonstrating a mean accuracy of 14.5 mm for ERA-Interim. Local analysis shows a 1 mm improvement using operational data. In the second approach, NWP derived Slant Path Delay (SPD) is validated against SAR SPD measured on Corner Reflectors in more than 300 TerraSAR-X High Resolution SpotLight acquisitions, demonstrating an accuracy in the centimeter-range for both ERA-Interim and operational data. Finally, the application of this accurate delay estimate for the mitigation of the impact of the neutral atmosphere on SAR absolute ranging and on differential interferometry, both for individual interferograms and multi-temporal processing, is demonstrated.

Item URL in elib:https://elib.dlr.de/133898/
Document Type:Contribution to a Collection
Additional Information:Reprinted from: Remote Sens. 2018, 10, 1515, doi:10.3390/rs10101515
Title:Mitigation of tropospheric delay in SAR and InSAR using NWP data: its validation and application examples
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Cong, Xiao YingXiao.Cong (at) dlr.deUNSPECIFIED
Balss, UlrichUlrich.Balss (at) dlr.deUNSPECIFIED
Rodriguez Gonzalez, FernandoFernando.RodriguezGonzalez (at) dlr.deUNSPECIFIED
Eineder, MichaelMichael.Eineder (at) dlr.dehttps://orcid.org/0000-0001-5068-1324
Date:April 2019
Journal or Publication Title:Ten Years of TerraSAR-X - Scientific Results (ISBN = 978-3-03897-724-7)
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 333-354
Editors:
EditorsEmail
Eineder, MichaelDLR-IMF
Roth, AchimDLR-DFD
Moreira, AlbertoDLR-IHR
Publisher:Miltidisciplinary Digital Publishing Institute (MPDI)
ISSN:2072-4292
ISBN:ISBN 978-3-03897-724-7 (pbk); ISBN 978-3-03897-725-4 (PDF)
Status:Published
Keywords:SAR; SAR interferometry; atmospheric propagation delay; persistent scatterer interferometry; numerical weather prediction; stratified atmospheric delay; zenith path delay; slant path delay.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - TSX/TDS Payload ground segment
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Balss, Dr. Ulrich
Deposited On:28 Jan 2020 15:15
Last Modified:28 Jan 2020 15:15

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