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Polarimetric SAR modelling of a two-layer structure: A case study based on subarctic lakes

Al-Kahachi, Noora (2013) Polarimetric SAR modelling of a two-layer structure: A case study based on subarctic lakes. Dissertation, Technische Universität München.

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Official URL: http://mediatum.ub.tum.de/?id=1142281

Abstract

The work contributes to the interpretation of quad polarimetric SAR data over (shallow) subarctic lakes, on the purpose of investigating SAR capabilities in revealing facts about the subsurface and the inhomogeneities within the ice layer which are dominated mainly by methane bubbles. For this, a model for the polarimetric backscattering from a two-layer structure observed by a fully polarimetric side looking synthetic aperture radar at low frequency (L-Band) is developed. The upper layer thickness is few metres thick and contains inhomogeneities. The developed model describes the backscattering as the incoherent sum of the three main contributions: subsurface (X-Bragg), volume and dihedral backscattering. The volume is modelled as a cloud of partially vertically oriented ellipsoids. The dihedral backscattering component is modelled as the electromagnetic wave reflected on the subsurface after being scattered by the same cloud of particles that is responsible for the volume backscattering. The mathematical formulation of this dihedral backscattering is presented for the first time here and proved to be an essential component in the model. The model simulations are compared to data obtained by ALOS-PALSAR over frozen shallow subarctic lakes acquired over several regions in the northern wetlands. ALOS data show the same polarimetric backscattered signature as the simulations. The model can describe temporal changes of the ice and the difference between grounded and floating ice.

Item URL in elib:https://elib.dlr.de/87787/
Document Type:Thesis (Dissertation)
Title:Polarimetric SAR modelling of a two-layer structure: A case study based on subarctic lakes
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Al-Kahachi, NooraUNSPECIFIEDUNSPECIFIED
Date:23 December 2013
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:163
Status:Published
Keywords:Polarimetry, Synthetic aperture radar SAR, Lakes, ice, Rayleigh scattering, Particle scattering
Institution:Technische Universität München
Department:Elektrotechnik und Informationstechnik
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 Multi-dimensionale SAR-Auswertung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Al-Kahachi, Noora R Abdulsttar
Deposited On:31 Jan 2014 19:58
Last Modified:31 Jul 2019 19:45

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