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

Cong, Xiaoying and Balss, Ulrich and Rodriguez Gonzalez, Fernando and Eineder, Michael (2018) Mitigation of tropospheric delay in SAR and InSAR using NWP data: its validation and application examples. Remote Sensing, 10 (10), pp. 1515-1535. Multidisciplinary Digital Publishing Institute (MDPI). doi: 10.3390/rs10101515. ISSN 2072-4292.

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Official URL: http://www.mdpi.com/journal/remotesensing/special_issues/TerraSAR-X


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/121749/
Document Type:Article
Additional Information:also reprinted in: Ten Years of TerraSAR-X - Scientific Results, ISBN 978-3-03897-725-4, MDPI 04/2019
Title:Mitigation of tropospheric delay in SAR and InSAR using NWP data: its validation and application examples
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Balss, Ulrichulrich.balss (at) dlr.deUNSPECIFIED
Rodriguez Gonzalez, Fernandofernando.rodriguezgonzalez (at) dlr.deUNSPECIFIED
Date:21 September 2018
Journal or Publication Title:Remote Sensing
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.3390/rs10101515
Page Range:pp. 1515-1535
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
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 - Earth Observation
DLR - Research theme (Project):R - TSX/TDX Payload Ground Segment
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Balss, Dr. Ulrich
Deposited On:21 Sep 2018 11:44
Last Modified:11 Feb 2021 17:47

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