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Surface parameter estimation using Bistatic polarimetric X-band measurements

Ben Khadhra, Kais (2008) Surface parameter estimation using Bistatic polarimetric X-band measurements. Dissertation. DLR-Forschungsbericht. DLR-FB-2008-20, 157 S.

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Official URL: http://archiv.tu-chemnitz.de/pub/2008/0143/index.html

Abstract

To date only very few bistatic measurements (airborne or in controlled laboratories) have been reported. Therefore most of the current remote sensing methods are still focused on monostatic (backscatter) measurements. These methods, based on theoretical, empirical or semi-empirical models, enable the estimation of soil roughness and the soil humidity (dielectric constant). For the bistatic case only theoretical methods have been developed and tested with monostatic data. Hence, there still remains a vital need to gain of experience and knowledge about bistatic methods and data. The main purpose of this thesis is to estimate the soil moisture and the soil roughness by using full polarimetric bistatic measurements. In the experimental part, bistatic X-band measurements, which have been recorded in the Bistatic Measurement Facility (BMF) at the DLR Oberpfaffenhofen, Microwaves and Radar Institute, will be presented. The bistatic measurement sets are composed of soils with different statistical roughness and different moistures controlled by a TDR (Time Domain Reflectivity) system. The BMF has been calibrated using the Isolated Antenna Calibration Technique (IACT). The validation of the calibration was achieved by measuring the reflectivity of fresh water. In the second part, bistatic surface scattering analyses of the calibrated data set were discussed. Then, the specular algorithm was used to estimate the soil moisture of two surface roughnesses (rough and smooth) has been reported. A new technique using the coherent term of the Integral Equation Method (IEM) to estimate the soil roughness was presented. Also, the sensitivity of phase and reflectivity with regard to moisture variation in the specular direction was evaluated. Finally, the first results and validations of bistatic radar polarimetry for the specular case of surface scattering have been introduced.

Document Type:Monograph (DLR-Forschungsbericht, Dissertation)
Title:Surface parameter estimation using Bistatic polarimetric X-band measurements
Authors:
AuthorsInstitution or Email of Authors
Ben Khadhra, KaisUNSPECIFIED
Date:October 2008
Refereed publication:No
Number of Pages:157
ISSN:1434-8454
Status:Published
Keywords:Bistatic Measurement Facility, bistatic polarimetry, Signal Phase, soil moisture, soil roughness, Specular Algorithm, surface scattering, X-Band
Institution:TU Chemnitz
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 SAR-Expert-Support-Lab (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute
Microwaves and Radar Institute > Spaceborne SAR Systems
Deposited By: Dr.-Ing. Kais Ben Khadhra
Deposited On:17 Nov 2008
Last Modified:12 Dec 2013 20:33

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