2D fresnel diffraction approach for wind turbine forward scattering

Abstract

Mitigation of wind turbine interference (WTI) requires modelling of its impact on radars, navigation systems and terrestrial radio links. A proper analysis of this interference by numerical field simulation, in particular including the effect of diffraction, requires a high computational effort as the problem is electrically extremely large. We propose a 2D Fresnel diffraction approach applied to tower and rotor of the wind turbine (WT) that is including the effect of perfect conducting or real ground. In order to speed up numerical integration an artifice using Babinet's principle is used. The theory allows for calculation of the time variant diffraction loss (or obstacle gain) and phase modulation. Results are compared with numerical 3D field simulations (UTD, Uniform Theory of Diffraction).