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.


    Access

    Download


    Export, share and cite



    Title :

    Surface parameter estimation using Bistatic polarimetric X-band measurements


    Contributors:

    Publication date :

    2008-10-01


    Type of media :

    Miscellaneous


    Type of material :

    Electronic Resource


    Language :

    English




    Surface Parameter Estimation using bistatic polarimetric X-band Measurements

    Ben Khadhra, Kais / Börner, Thomas / Hounam, David et al. | German Aerospace Center (DLR) | 2012

    Free access

    Soil Parameter Estimation and Analysis of Bistatic Scattering X-Band Controlled Measurements

    Ben Khadhra, Kais / Boerner, Thomas / Chandra, Madhu et al. | German Aerospace Center (DLR) | 2007

    Free access

    Detection of object symmetry using bistatic and polarimetric GPR observations

    Stiles, J.M. / Parra-Bocaranda, P. / Apte, A. | Tema Archive | 1999


    Bistatic Polarimetric SAR Decomposition in Terms of Roll-Invariant Parameters

    Bombrun, L. / European Space Agency | British Library Conference Proceedings | 2011


    L-band Polarimetric Interferometry in Boreal Forest Parameter Estimation, a Case study

    Praks, Jaan / Hallikainen, Martti / Kugler, Florian et al. | German Aerospace Center (DLR) | 2006

    Free access