Analysis of the Effect of Soil Roughness in the Forward-Scattering Interference Pattern Using Second-Order Small Perturbation Method Simulations

Soil moisture (SM) is a key geophysical variable that can be estimated at regional scales using remote sensing techniques, by making use of the known relationship between soil reflectivity and the dielectric constant in the microwave regime. In this context, the exploitation of available illuminator...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2019-05, Vol.16 (5), p.692-696
Main Authors: Franco, Mariano, More, Emanuel, Roitberg, Esteban, Grings, Francisco, Piegari, Estefania, Douna, Vanesa, Perna, Pablo
Format: Article
Language:English
Subjects:
Antenna measurements
Brewster angle
Computer simulation
Dielectric constant
Electromagnetic and remote sensing
Exploitation
Geophysics
Global Navigation Satellite System data
Illuminators
Interference
IP networks
Microwave frequencies
microwave radiometry
Pattern analysis
Perturbation method
Perturbation methods
Radar
Reflectance
Remote sensing
Remote sensing techniques
Rough surfaces
Roughness
SAR (radar)
Scattering
Sensing techniques
Soil
Soil moisture
surface and subsurface properties
Surface roughness
Surface waves
Synthetic aperture radar
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Summary:Soil moisture (SM) is a key geophysical variable that can be estimated at regional scales using remote sensing techniques, by making use of the known relationship between soil reflectivity and the dielectric constant in the microwave regime. In this context, the exploitation of available illuminators of opportunity that currently emit large amounts of power at microwave frequencies (compared to typical synthetic aperture radar systems) is promising. Some published techniques estimate SM by analyzing the interference pattern (IP) between direct and reflected signal as measured by a single antenna (i.e., IP technique). In this letter, a new approach to simulate the IP is proposed, in which the soil roughness is modeled straightforwardly using the second-order small perturbation model. Results illustrate that the "notch" in the VV-polarization IP (related to the Brewster angle) can only be directly observed for very low values of soil rms roughness ( s < 0.5 cm). For typical values of soil roughness ( s\sim 1.2 cm), the notch disappears and only a minimum in the IP is observed near the Brewster angle.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2018.2882688