Percorrer por autor "Morgadinho, S."
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- Analysis of the dRET input parameters under varying wind conditions at 20 GHzPublication . Morgadinho, S.; Caldeirinha, Rafael; Fernandes, Telmo, Telmo Rui Carvalhinho Cunha, Telmo R.; Richter, J.In this paper, the discrete Radiative Energy Transfer (dRET) theory is addressed as a means to the model dynamic effects through vegetation at millimetre-wave frequencies. The proposed approach, suggests the use of the dRET input parameters time-variant properties, to achieve the modelling of time-variant effects. Analysis of the input parameters time-variability, and its effect on the directional spectra is performed, in order to assess the feasibility of the proposed model approach.
- A feasibility study on the extension of the point scatterer formulation to include wind induced dynamicsPublication . Leonor, N; Caldeirinha, Rafael; Sanchez, M; Fernandes, Telmo; Morgadinho, S.This paper presents a feasibility study on the extension of the point scatterer formulation to include time-varying effects caused by wind induced channel dynamics. This modeling approach, which is based on a ray-tracing algorithm, employs various point scatterers with specific radiation characteristics, distributed within a computational volume, to characterize the electromagnetic behavior in the presence of trees and vegetation volumes. This propagation model has now been extended to include the time-varying received signal level, caused by the swaying motion of branches, twigs and leafs. To this extent, a statistical model is used to characterize the time-varying attenuation of each multipath component. The performance of the proposed model is assessed against measurements intended to record the dynamic re-radiation pattern of a tree in various windy conditions, which included four wind directions and two wind speeds.