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Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar

Sharma, Jayanti (2010) Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar. Dissertation. DLR-Forschungsbericht. DLR-FB--2010-24, 240 S.

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Abstract

In recent years there has been increased interest in using synthetic aperture radar (SAR) to study glaciers for climate change research. Extensions to SAR such as polarimetric interferometric SAR (Pol-InSAR) offer additional potential in quantifying glaciological parameters such as the extinction coefficient. Extinctions are useful in characerising regions in increased volume scatter, which are related to the presence of ice structure. In this thesis a new scattering model relating long-wavelength Pol-InSAR observables to the ice extinction coefficient is proposed. Pol-InSAR coherences are modelled as a combination of a surface contribution (from the snow-firn interface and wind-induced sastrugi features) and a volume response. Surface-to-volume scattering ratios derived from a novel polarimetric decomposition are used with Pol-InSAR coherences to invert the extinction of the ice volume. The inversion is performed on airborne Pol-InSAR data at L-band and P-band frequencies acquired by DLR's E-SAR system over the Austfonna ice cap in Svalbard. Extinction dependencies on frequency and glacier zone are investigated, and validation is pefromed comparing ground penetrating radar data and airborne sounder data to extinction values.

Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:Estimation of Glacier Ice Extinction Coefficients using Long-Wavelength Polarimetric Interferometric Synthetic Aperture Radar
Authors:
AuthorsInstitution or Email of Authors
Sharma, JayantiUNSPECIFIED
Date:12 August 2010
Journal or Publication Title:DLR Forschungsbericht 2010-24
Number of Pages:240
Status:Published
Keywords:SAR, polarimetric interferometric SAR, polarimetric decomposition, glaciers, extinction
Institution:Karlsruher Institut für Technologie
Department:Elektrotechnik und Informationstechnik
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Prosmart, Smart-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Jens Fischer
Deposited On:05 Jul 2011 15:11
Last Modified:05 Jul 2011 15:11

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