Listar por tema "Scattering"
Mostrando ítems 1-11 de 11
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Amorphous glass-coated ferromagnetic wires in microwave engineering
En esta tesis se ha estudiado el uso de hilos ferromagnéticos recubiertos de vidrio en ingeniería de microondas. Para este fin, se han formulado modelos analíticos y equivalentes circuitales de la interacción entre un ... -
Bulk optical of potato flesh in the 500 – 1900 nm range
In this study, the optical properties of potato flesh tissue were estimated using double-integrating sphere (DIS) measurements combined with an inverse adding-doubling (IAD) light propagation model. Total reflectance, ... -
Error in radar-derived soil moisture due to roughness parameterization: an analysis based on synthetical surface profiles
In the past decades, many studies on soil moisture retrieval from SAR demonstrated a poor correlation between the top layer soil moisture content and observed backscatter coefficients, which mainly has been attributed ... -
Evaluating noise in passive beam forming networks for multibeam applications
In this work, we identify that the analysis in terms of noise of multibeam passive beam forming networks requires a proper formulation, in order not to overestimate the noise generated by the network. We show that the ... -
Hybrid computational techniques: electromagnetic propagation analysis in complex indoor environments
In this article, we compare deterministic methodologies for characterizing channel behavior in heterogeneous and composite scenarios. These techniques include one that combines a 3D ray launching (RL) approach based on ... -
A hybrid ray launching-diffusion equation approach for propagation prediction in complex indoor environments
A novel and efficient deterministic approach to model radio wave propagation channels in complex indoor environments improving prediction accuracy is proposed. This technique combines a 3-D Ray Launching algorithm based ... -
Influence of surface roughness measurement scale on radar backscattering in different agricultural soils
Soil surface roughness strongly affects the scattering of microwaves on the soil surface and determines the backscattering coefficient (σ 0 ) observed by radar sensors. Previous studies have shown important scale issues ... -
Influence of surface roughness spatial variability and temporal dynamics on the retrieval of soil moisture from SAR observations
Radar-based surface soil moisture retrieval has been subject of intense research during the last decades. However, several difficulties hamper the operational estimation of soil moisture based on currently available ... -
A multipolar analysis of near-field absorption and scattering processes
A multipolar formulation is adopted to investigate the absorption and scattering processes involved in near-field interactions. This approach allows one to determine the upper bounds for the absorbed and radiated powers ... -
A radio channel model for D2D communications blocked by single trees in forest environments
In this paper we consider the D2D (Device-to-Device) communication taking place between Wireless Sensor Networks (WSN) elements operating in vegetation environments in order to achieve the radio channel characterization ... -
Remote (250 km) fiber Bragg grating multiplexing system
We propose and demonstrate two ultra-long range fiber Bragg grating (FBG) sensor interrogation systems. In the first approach four FBGs are located 200 km from the monitoring station and a signal to noise ratio of 20 dB ...