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Article

An Approach to Extended Fresnel Scattering for Modeling of Depolarizing Soil-Trunk Double-Bounce Scattering

German Aerospace Center, Microwaves and Radar Institute, P.O. BOX 1116, 82234 Wessling, Germany
Academic Editors: Nicolas Baghdadi and Prasad S. Thenkabail
Remote Sens. 2016, 8(10), 818; https://doi.org/10.3390/rs8100818
Received: 15 June 2016 / Revised: 8 September 2016 / Accepted: 26 September 2016 / Published: 1 October 2016
Focusing on scattering from natural media, dihedral (double bounce) scattering is often characterized as a soil-trunk double Fresnel reflection, like for instance, in most model-based decompositions. As soils are predominantly rough in agriculture, the classical Rank 1 dihedral scattering component has to be extended to account for soil roughness-induced depolarization. Therefore, an azimuthal Line of Sight (LoS) rotation is applied solely on the soil plane of the double-bounce reflection to generate a depolarized dihedral scattering signal in agriculture. The results of the sensitivity analysis are shown for a distributed target in coherency matrix representation. It reveals that the combination of coherency matrix elements T22XD + T33XD is quasi-independent of the roughness-induced depolarization, while (T22XD − T33XD)/(T22XD + T33XD) is quasi-independent of the dielectric properties of the reflecting media. Therefore, a depolarization-independent retrieval of soil moisture or a direct roughness retrieval from the extended dihedral scattering component might be possible in stalk-dominated agriculture under certain conditions (e.g., the influence of a differential phase stays at a low level: ϕ < 15°). The first analyses with L-band airborne-SAR data of DLR’s E-SAR and F-SAR systems in agricultural regions during the AgriSAR, OPAQUE, SARTEO and TERENO project campaigns state the existence and potential of the extended Fresnel scattering mechanism to represent dihedral scattering between a rough (tilled) soil and the stalks of the agricultural plants. View Full-Text
Keywords: SAR; polarimetry; extended Fresnel scattering; depolarization; soil moisture; soil roughness SAR; polarimetry; extended Fresnel scattering; depolarization; soil moisture; soil roughness
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MDPI and ACS Style

Jagdhuber, T. An Approach to Extended Fresnel Scattering for Modeling of Depolarizing Soil-Trunk Double-Bounce Scattering. Remote Sens. 2016, 8, 818. https://doi.org/10.3390/rs8100818

AMA Style

Jagdhuber T. An Approach to Extended Fresnel Scattering for Modeling of Depolarizing Soil-Trunk Double-Bounce Scattering. Remote Sensing. 2016; 8(10):818. https://doi.org/10.3390/rs8100818

Chicago/Turabian Style

Jagdhuber, Thomas. 2016. "An Approach to Extended Fresnel Scattering for Modeling of Depolarizing Soil-Trunk Double-Bounce Scattering" Remote Sensing 8, no. 10: 818. https://doi.org/10.3390/rs8100818

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