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Investigations on the Polarimetric Behavior of a Target near the Soil

Marquart, Nicolas Pascal (2007) Investigations on the Polarimetric Behavior of a Target near the Soil. In: Proceedings of Wave Propagation in Communication, Microwave Systems and Navigation (WFMN), pp. 104-109. ITG Information Technology within VDE. Wave Propagation in Communication, Microwave Systems and Navigation (WFMN), 2007-07-04 - 2007-07-05, Chemnitz, Germany.

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Official URL: http://www.tu-chemnitz.de/etit/hf/wfmn07/

Abstract

The diffraction of a plane wave by an object situated close to an interface of a two-layer medium has been investigated by many authors and an extensive literature exists on this topic. However, only a few publications have been devoted to the analysis of the polarimetric behaviour of the diffracted field. In general, very simple ray models based on the Geometrical Optic (GO) are considered involving single and double bounced waves for explaining some experimental results. Here, this problem is again investigated by using a more refined ray model based on the Geometrical Theory of Diffraction (GTD). As a result a ray system composed of 13 different rays was implemented for the monostatic case by applying the principle of Fermat. The different spatial and creeping waves give a physical insight in the mechanisms involved in the entire scattering process. Depending on the geometrical properties of the target, lit and shadow regions arise in the backscattered GTD field for a variation from perpendicular to grazing incidence for a monostatic alignment of the transmitting and receiving antenna. The separating line of such a lit and shadow region is called a Surface Shadow Boundary (SSB). A special emphasis is attributed to the transition regions near the shadow boundaries where the reflected spatial waves disappear and transform into creeping waves leading to a strong attenuation. The diffracted field for look angles related to the transition zones has a characteristic polarimetric behaviour which is represented on the Poincaré sphere. The typical locations on the sphere can be exploited in order to get information about the geometrical parameters of the target and its height above the ground.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Investigations on the Polarimetric Behavior of a Target near the Soil
Authors:
AuthorsInstitution or Email of Authors
Marquart, Nicolas PascalUNSPECIFIED
Date:October 2007
Journal or Publication Title:Proceedings of Wave Propagation in Communication, Microwave Systems and Navigation (WFMN)
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 104-109
Editors:
EditorsEmail
VDE, UNSPECIFIED
Publisher:ITG Information Technology within VDE
Series Name:WFMN 2007 Conference Proceedings
Status:Published
Keywords:Geometrical Theory of Diffraction, Uniform Theory of Diffraction, Radar polarimetry, Poincaré sphere
Event Title:Wave Propagation in Communication, Microwave Systems and Navigation (WFMN)
Event Location:Chemnitz, Germany
Event Type:international Conference
Event Dates:2007-07-04 - 2007-07-05
Organizer:Chemnitz University of Technology
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 Entwicklung eines Mini-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Microwave Systems
Microwaves and Radar Institute
Deposited By: Dr. Nicolas Pascal Marquart
Deposited On:20 Feb 2008
Last Modified:12 Dec 2013 20:25

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