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A Case Study on the Correction of Atmospheric Phases for SAR Tomography in Mountainous Regions

Siddique, Muhammad Adnan and Strozzi, T. and Hajnsek, Irena and Frey, Othmar (2019) A Case Study on the Correction of Atmospheric Phases for SAR Tomography in Mountainous Regions. IEEE Transactions on Geoscience and Remote Sensing, 57 (1), pp. 416-431. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TGRS.2018.2855101 ISSN 0196-2892

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Official URL: https://ieeexplore.ieee.org/document/8450633


Synthetic aperture radar (SAR) tomography with repeat-pass acquisitions generally requires a priori phase calibration of the interferometric data stack by compensating for the atmosphere-induced phase delay variations. These variations act as a disturbance in tomographic focusing. In mountainous regions, the mitigation of these disturbances is particularly challenging due to strong spatial variations of the local atmospheric conditions and propagation paths through the troposphere. In this paper, we assess a data-driven approach to estimate these phase variations under a regression-kriging framework. The vertical stratification of the troposphere is modeled functionally, while the impact of the spatial turbulence is considered in a stochastic sense. The methodology entails an initial persistent scatterer interferometry (PSI) analysis. The atmospheric phases isolated for the persistent scatterers (PS) within the PSI processing are considered as samples of the 3-D distribution of the phase delay variations over the scene. These atmospheric phases are regressed against the spatial coordinates in map geometry at PS locations. In turn, kriging predictions are obtained at each location along the elevation profile, where tomographic focusing is intended. A key point of this approach is that the requisite atmospheric corrections are incorporated within the tomographic focusing model. A case study has been performed on a data stack comprising 32 COSMO-SkyMed stripmap images acquired over the Matter Valley in the Swiss Alps, in the summers of 2008–2013. The results show locally improved deformation sampling with tomographic methods compared to the initial PSI solution, primarily due to the improved phase calibration. In general, this paper underscores the indispensability of height-dependent correction of atmospheric phases for SAR tomography.

Item URL in elib:https://elib.dlr.de/124718/
Document Type:Article
Title:A Case Study on the Correction of Atmospheric Phases for SAR Tomography in Mountainous Regions
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Siddique, Muhammad AdnanETH ZürichUNSPECIFIED
Date:January 2019
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1109/TGRS.2018.2855101
Page Range:pp. 416-431
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Atmospheric phases, deformation analysis in mountainous areas, persistent scatterer interferometry (PSI), radar interferometry, synthetic aperture radar (SAR), SAR interferometry, SAR tomography, tomography in mountainous regions
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 - Vorhaben Sicherheitsrelevante Erdbeobachtung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:17 Dec 2018 08:31
Last Modified:11 Jan 2019 14:09

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