THE TOUZI DECOMPOSITION FOR A UNIQUE AND POLARIZATION BASIS INVARIANT DECOMPOSITION OF TARGET SCATTERING USING POLARIMETRIC SAR

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Research areas:
Year:
2017
Type of Publication:
Article
Keywords:
Polarimetry, Synthetic Aperture Radar, peatland, urban, permafrost
Authors:
Touzi, Ridha
Abstract:
The objectives of target decomposition theory is to express the average scattering mechanism as the sum of independent elements and to associate a physical mechanism with each component. Two categories of incoherent target decomposition (ICTD) can be distinguished; the model-based decompositions (MBD) firstly introduced by Freeman and Durden in 1998, and the eigenvector based decomposition (EVBD) introducedby Cloude and Barnes in 1986. The Freeman MBD assumes that target scattering can be modeled as the linear sum of surface, double-bounce and volume scattering. Since that, many MBDs have been introduced as an extension of Freeman’s decomposition with various target scattering models. As a result, MBD cannot lead to a unique scattering decomposition, since the latter depends on the a-priori scattering model used as the basis of the MBD.Even though EGVB is supposed to lead to a unique scattering decomposition. Many EGVB decompositions have been popular; such as the Cloude-Pottier, Van Zyl, Touzi, and Palladini decomposition. In this study, the Touzi decomposition is presented as the synthesis of more than 50 years research in polarization optimization theory (Kennaugh-Huynen, Graves, Boerner, Cloude-Pottier, Barnes, Cameron, ...). It is shown that the Touzi decomposition is the only EVBD that leads to a unique and polarization basis invariant scattering characterization. The multi-resolution Touzi decomposition, which permits a unified decomposition of both coherent and partially coherent target scattering, is also presented. Polarimetric C-band RADARSAT-2 and L-band ALOS are used to demonstrate the key information provided by the Touzi decomposition for various applications; urban mapping, peatland subsurface hydrology monitoring, and discontinuous subsurface permafrost mapping Northern Canada. It is shown that the excellent design of both SAR missions, with low noise floor, is important to fully exploit the added value of polarimetric SAR information in support of key applications of low HV backscattering.
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