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Formalism of Compact Polarimetric Descriptors and Extension of the ΔαB/αB Method for General Compact-Pol SAR

Yin, Junjun and Papathanassiou, Konstantinos and Yang, Jian (2019) Formalism of Compact Polarimetric Descriptors and Extension of the ΔαB/αB Method for General Compact-Pol SAR. IEEE Transactions on Geoscience and Remote Sensing, 57 (12), pp. 10322-10335. IEEE - Institute of Electrical and Electronics Engineers. DOI: 10.1109/TGRS.2019.2933556 ISSN 0196-2892

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Official URL: https://ieeexplore.ieee.org/document/8816676


Compact polarimetry is a dual-polarization hybrid imaging mode and provides partially backscatter characteristics of scatterers. The compact polarimetric (CP) synthetic aperture radar (SAR) measures the combinations of fully polarimetric (FP) scattering coefficients, which is dependent on the transmit-wave polarization state. The backscattered wave is fully described by a 2-D complex scattering vector, in which the dual-channel polarization ratio represents the vector nature for describing target polarimetric properties. However, due to the dependence of CP measurements on the transmit wave, the complex channel ratio is explained differently for the same scatterers under different observation modes, e.g., the channel ratio $\rho =\pm j$ under the left circular mode and $\rho =\pm 1$ under the linear $\pi /4$ mode for the canonical trihedral and dihedral scatterers. The explanation diversity is inconvenient for the use of CP data, resulting in nonunified target decomposition algorithms. In this study, first, we propose a new formalism method for the general CP SAR mode, such that all CP mode observables are described based on the same standard for target scattering characterization. This provides potential for developing unified CP decomposition algorithms. Then, based on this formalism, a polarization ratio-based scattering characterization method is proposed, which is mathematically equal to the FP $\Delta \alpha _{\text {B}}/\alpha _{\text {B}}$ method but without any scattering assumption. Theoretical analyses and discussions are provided. Experiments show that the proposed method is efficient for compact polarimetric scattering interpretation.

Item URL in elib:https://elib.dlr.de/131508/
Document Type:Article
Title:Formalism of Compact Polarimetric Descriptors and Extension of the ΔαB/αB Method for General Compact-Pol SAR
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Papathanassiou, KonstantinosKostas.Papathanassiou (at) dlr.deUNSPECIFIED
Date:27 August 2019
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1109/TGRS.2019.2933556
Page Range:pp. 10322-10335
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Series Name:IEEE
Keywords:Classification, compact polarimetry, formalism, physical scattering mechanism, synthetic aperture radar (SAR), target decomposition
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 Sicherheitsrelevante Erdbeobachtung
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Radzuweit, Sibylle
Deposited On:29 Nov 2019 14:46
Last Modified:29 Nov 2019 14:46

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